{"id":1562,"date":"2020-06-14T21:36:40","date_gmt":"2020-06-14T13:36:40","guid":{"rendered":"https:\/\/www.strongd.net\/?p=1562"},"modified":"2020-06-14T21:36:40","modified_gmt":"2020-06-14T13:36:40","slug":"%e5%b8%8c%e6%9c%9b%e6%98%af%e6%9c%80%e6%b7%ba%e9%a1%af%e6%98%93%e6%87%82%e7%9a%84-rxjs-%e6%95%99%e5%ad%b8","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=1562","title":{"rendered":"\u5e0c\u671b\u662f\u6700\u6dfa\u986f\u6613\u61c2\u7684 RxJS \u6559\u5b78"},"content":{"rendered":"<h1>\u524d\u8a00<\/h1>\n<p>\u95dc\u6ce8 RxJS \u5df2\u7d93\u597d\u4e00\u6bb5\u6642\u9593\u4e86\uff0c\u6700\u65e9\u77e5\u9053\u9019\u500b\u6771\u897f\u662f\u56e0\u70ba\u00a0<a href=\"https:\/\/redux-observable.js.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">redux-observable<\/a>\uff0c\u662f\u4e00\u500b redux \u7684 middleware\uff0cNetflix \u5229\u7528\u5b83\u4f86\u89e3\u6c7a\u8907\u96dc\u7684\u975e\u540c\u6b65\u76f8\u95dc\u554f\u984c\uff0c\u90a3\u6642\u5019\u6211\u9023<code>redux-saga<\/code>\u90fd\u9084\u6c92\u641e\u61c2\uff0c\u6c92\u60f3\u5230\u5c31\u53c8\u6709\u65b0\u7684\u6771\u897f\u51fa\u4f86\u4e86\u3002<\/p>\n<p>\u534a\u5e74\u524d\u82b1\u4e86\u4e00\u4e9b\u6642\u9593\uff0c\u627e\u4e86\u5f88\u591a\u7db2\u8def\u4e0a\u7684\u8cc7\u6599\uff0c\u8a66\u5716\u60f3\u8981\u641e\u61c2\u9019\u6574\u500b\u6771\u897f\u3002\u53ef\u662f\u5c0d\u6211\u4f86\u8aaa\uff0c\u5f88\u591a\u6559\u5b78\u7684\u6b65\u8abf\u90fd\u592a\u5feb\u4e86\uff0c\u4e0d\u7136\u5c31\u662f\u8b1b\u5f97\u592a\u4ed4\u7d30\uff0c\u53cd\u800c\u8b93\u521d\u5b78\u8005\u7121\u6240\u9069\u5f9e\u3002<\/p>\n<p>\u9019\u6b21\u6709\u6a5f\u6703\u5728\u516c\u53f8\u7684\u65b0\u5c08\u6848\u88e1\u9762\u5617\u8a66\u5c0e\u5165<code>redux-observable<\/code>\uff0c\u8eab\u70ba\u63d0\u5021\u8981\u5c0e\u5165\u7684\u4eba\uff0c\u52e2\u5fc5\u8981\u5c0d\u9019\u6771\u897f\u6709\u4e00\u5b9a\u7684\u77ad\u89e3\u3002\u79c9\u6301\u8457\u9019\u500b\u60f3\u6cd5\uff0c\u4e0a\u9031\u8a8d\u771f\u82b1\u4e86\u9ede\u6642\u9593\u518d\u6b21\u628a\u76f8\u95dc\u8cc7\u6e90\u90fd\u7814\u7a76\u4e86\u4e00\u4e0b\uff0c\u6f38\u6f38\u6574\u7406\u51fa\u4e00\u5957\u300c\u6211\u89ba\u5f97\u61c9\u8a72\u53ef\u4ee5\u628a RxJS \u8b1b\u5f97\u66f4\u597d\u61c2\u300d\u7684\u65b9\u6cd5\uff0c\u5728\u9019\u908a\u8ddf\u5927\u5bb6\u5206\u4eab\u4e00\u4e0b\u3002<\/p>\n<p>\u5728\u958b\u59cb\u4e4b\u524d\uff0c\u8981\u5148\u5927\u529b\u7a31\u8b9a\u53bb\u5e74 iT \u90a6\u5e6b\u5fd9\u9435\u4eba\u8cfd\u7684 Web \u7d44\u51a0\u8ecd\uff1a<a href=\"https:\/\/ithelp.ithome.com.tw\/users\/20103367\/ironman\/1199\" target=\"_blank\" rel=\"noopener noreferrer\">30 \u5929\u7cbe\u901a RxJS<\/a>\uff0c\u9019\u7cfb\u5217\u6587\u7ae0\u5beb\u5f97\u5f88\u5b8c\u6574\uff0c\u611f\u53d7\u5f97\u51fa\u4f86\u4f5c\u8005\u4e0b\u4e86\u5f88\u591a\u529f\u592b\u5728\u9019\u4e0a\u9762\u3002\u770b\u5b8c\u9019\u7bc7\u4e4b\u5f8c\u5982\u679c\u5c0d\u66f4\u591a\u61c9\u7528\u6709\u8208\u8da3\u7684\uff0c\u53ef\u4ee5\u53bb\u628a\u9019\u7cfb\u5217\u7684\u6587\u7ae0\u8b80\u5b8c\u3002<\/p>\n<p>\u597d\uff0c\u90a3\u5c31\u8b93\u6211\u5011\u958b\u59cb\u5427\uff01<\/p>\n<h1>\u8acb\u4f60\u5148\u5fd8\u6389 RxJS<\/h1>\n<p>\u6c92\u932f\uff0c\u4f60\u6c92\u770b\u932f\u3002<\/p>\n<p>\u8981\u5b78\u6703 RxJS \u7684\u7b2c\u4e00\u4ef6\u4e8b\u60c5\u5c31\u662f\uff1a\u5fd8\u8a18\u5b83\u3002<\/p>\n<p>\u5fd8\u8a18\u6709\u9019\u500b\u6771\u897f\uff0c\u5b8c\u5168\u5fd8\u8a18\uff0c\u5148\u8b93\u6211\u8b1b\u5e7e\u500b\u5176\u4ed6\u6771\u897f\uff0c\u7b49\u6211\u5011\u9700\u8981\u8b1b\u5230 RxJS \u7684\u6642\u5019\u6211\u6703\u518d\u63d0\u9192\u4f60\u7684\u3002<\/p>\n<p>\u5728\u6211\u5011\u8ac7\u5230\u4e3b\u89d2\u4e4b\u524d\uff0c\u5148\u4f86\u505a\u4e00\u4e9b\u6709\u8da3\u7684\u4e8b\u60c5\u5427\uff01<\/p>\n<h1>\u7a0b\u5f0f\u57fa\u790e\u80fd\u529b\u6e2c\u8a66<\/h1>\n<p>\u5148\u8b93\u6211\u5011\u505a\u4e00\u500b\u7c21\u55ae\u7684\u7df4\u7fd2\u984c\u6696\u8eab\uff0c\u984c\u76ee\u662f\u9019\u6a23\u7684\uff1a<\/p>\n<blockquote><p>\u6709\u4e00\u500b\u9663\u5217\uff0c\u88e1\u9762\u6709\u4e09\u7a2e\u985e\u578b\u7684\u8cc7\u6599\uff1a\u6578\u5b57\u3001a~z\u7d44\u6210\u7684\u5b57\u4e32\u3001\u6578\u5b57\u7d44\u6210\u7684\u5b57\u4e32\uff0c\u8acb\u4f60\u628a\u6bcf\u500b\u6578\u5b57\u4ee5\u53ca\u6578\u5b57\u7d44\u6210\u7684\u5b57\u4e32\u4e58\u4ee5\u4e8c\u4e4b\u5f8c\u52a0\u7e3d<br \/>\n\u7bc4\u4f8b\u8f38\u5165\uff1a[1, 5, 9, 3, &#8216;hi&#8217;, &#8216;tb&#8217;, 456, &#8217;11&#8217;, &#8216;yoyoyo&#8217;]<\/p><\/blockquote>\n<p>\u4f60\u770b\u5b8c\u4e4b\u5f8c\u61c9\u8a72\u6703\u8aaa\uff1a\u300c\u9019\u6709\u4ec0\u9ebc\u96e3\u7684\uff1f\u300d\uff0c\u4e26\u4e14\u5728\u4e00\u5206\u9418\u4ee5\u5167\u5c31\u5beb\u51fa\u4e0b\u9762\u7684\u7a0b\u5f0f\u78bc\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-keyword\">const<\/span> source = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">9<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-string\">'hi'<\/span>, <span class=\"hljs-string\">'tb'<\/span>, <span class=\"hljs-number\">456<\/span>, <span class=\"hljs-string\">'11'<\/span>, <span class=\"hljs-string\">'yoyoyo'<\/span>];\r\n<span class=\"hljs-keyword\">let<\/span> total = <span class=\"hljs-number\">0<\/span>;\r\n\r\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">let<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; source.length; i++) {\r\n  <span class=\"hljs-keyword\">let<\/span> num = <span class=\"hljs-built_in\">parseInt<\/span>(source[i], <span class=\"hljs-number\">10<\/span>);\r\n  <span class=\"hljs-keyword\">if<\/span> (!<span class=\"hljs-built_in\">isNaN<\/span>(num)) {\r\n    total += num * <span class=\"hljs-number\">2<\/span>;\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u76f8\u4fe1\u5927\u5bb6\u4e00\u5b9a\u90fd\u662f\u5f88\u76f4\u89ba\u7684\u5c31\u5beb\u51fa\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\uff0c\u4f46\u5982\u679c\u4f60\u662f\u500b functional programming \u7684\u611b\u597d\u8005\uff0c\u4f60\u53ef\u80fd\u6703\u6539\u7528\u53e6\u5916\u4e00\u7a2e\u601d\u8def\u4f86\u89e3\u6c7a\u554f\u984c\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-keyword\">const<\/span> source = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">9<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-string\">'hi'<\/span>, <span class=\"hljs-string\">'tb'<\/span>, <span class=\"hljs-number\">456<\/span>, <span class=\"hljs-string\">'11'<\/span>, <span class=\"hljs-string\">'yoyoyo'<\/span>];\r\n\r\n<span class=\"hljs-keyword\">let<\/span> total = source\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">x<\/span> =&gt;<\/span> <span class=\"hljs-built_in\">parseInt<\/span>(x, <span class=\"hljs-number\">10<\/span>))\r\n  .filter(<span class=\"hljs-function\"><span class=\"hljs-params\">x<\/span> =&gt;<\/span> !<span class=\"hljs-built_in\">isNaN<\/span>(x))\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">x<\/span> =&gt;<\/span> x * <span class=\"hljs-number\">2<\/span>)\r\n  .reduce(<span class=\"hljs-function\">(<span class=\"hljs-params\">total, value<\/span>) =&gt;<\/span> total + value )\r\n<\/code><\/pre>\n<p>\u4e00\u958b\u59cb\u7684\u4f8b\u5b50\u53eb\u505a<code>Imperative\uff08\u547d\u4ee4\u5f0f\uff09<\/code>\uff0c\u7528\u9663\u5217\u642d\u914d\u4e00\u5806\u51fd\u5f0f\u7684\u4f8b\u5b50\u53eb\u505a<code>Declarative\uff08\u8072\u660e\u5f0f\uff09<\/code>\u3002\u5982\u679c\u4f60\u53bb\u67e5\u4e86\u4e00\u4e0b\u5b9a\u7fa9\uff0c\u61c9\u8a72\u6703\u770b\u5230\u9019\u5169\u500b\u7684\u89e3\u91cb\uff1a<\/p>\n<blockquote><p>Imperative \u662f\u547d\u4ee4\u6a5f\u5668\u53bb\u505a\u4e8b\u60c5\uff08how\uff09\uff0c\u9019\u6a23\u4e0d\u7ba1\u4f60\u60f3\u8981\u7684\u662f\u4ec0\u9ebc\uff08what\uff09\uff0c\u90fd\u6703\u6309\u7167\u4f60\u7684\u547d\u4ee4\u5be6\u73fe\uff1bDeclarative \u662f\u544a\u8a34\u6a5f\u5668\u4f60\u60f3\u8981\u7684\u662f\u4ec0\u9ebc\uff08what\uff09\uff0c\u8b93\u6a5f\u5668\u60f3\u51fa\u5982\u4f55\u53bb\u505a\uff08how\uff09<\/p><\/blockquote>\n<p>\u597d\uff0c\u4f60\u6709\u770b\u61c2\u4e0a\u9762\u9019\u4e9b\u5728\u8aaa\u4ec0\u9ebc\u55ce\uff1f<\/p>\n<p>\u6211\u662f\u6c92\u6709\u5566\u3002<\/p>\n<p>\u6240\u4ee5\u8b93\u6211\u5011\u518d\u770b\u4e00\u500b\u4f8b\u5b50\uff0c\u5176\u5be6 Declarative \u4f60\u5df2\u7d93\u5e38\u5e38\u5728\u7528\u4e86\uff0c\u53ea\u662f\u4f60\u4e0d\u77e5\u9053\u800c\u5df2\uff0c\u90a3\u5c31\u662f SQL\uff1a<\/p>\n<pre><code class=\"lang-sql hljs\"><span class=\"hljs-keyword\">SELECT<\/span> * <span class=\"hljs-keyword\">from<\/span> dogs <span class=\"hljs-keyword\">INNER<\/span> <span class=\"hljs-keyword\">JOIN<\/span> owners <span class=\"hljs-keyword\">WHERE<\/span> dogs.owner_id = owners.id\r\n<\/code><\/pre>\n<p>\u9019\u53e5\u8a71\u5c31\u662f\uff1a\u6211\u8981\u6240\u6709\u72d7\u7684\u8cc7\u6599\u52a0\u4e0a\u4e3b\u4eba\u7684\u8cc7\u6599\u3002<\/p>\n<p>\u6211\u53ea\u6709\u8aaa\u300c\u6211\u8981\u300d\u800c\u5df2\uff0c\u90a3\u8981\u600e\u9ebc\u62ff\u5230\u9019\u4e9b\u8cc7\u6599\uff1f\u6211\u4e0d\u77e5\u9053\uff0c\u6211\u4e5f\u4e0d\u7528\u77e5\u9053\uff0c\u90fd\u8b93 SQL \u5e95\u5c64\u6c7a\u5b9a\u600e\u9ebc\u53bb\u64cd\u4f5c\u5c31\u597d\u3002<\/p>\n<p>\u5982\u679c\u6211\u8981\u81ea\u5df1\u505a\u51fa\u9019\u4e9b\u8cc7\u6599\uff0c\u5728 JavaScript \u88e1\u9762\u6211\u5fc5\u9808\u9019\u6a23\u5beb\uff08\u7a0b\u5f0f\u78bc\u53d6\u81ea<a href=\"http:\/\/www.vaikan.com\/imperative-vs-declarative\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u58f0\u660e\u5f0f\u7f16\u7a0b\u548c\u547d\u4ee4\u5f0f\u7f16\u7a0b\u7684\u6bd4\u8f83<\/a>\uff09\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-comment\">\/\/dogs = [{name: 'Fido', owner_id: 1}, {...}, ... ]<\/span>\r\n<span class=\"hljs-comment\">\/\/owners = [{id: 1, name: 'Bob'}, {...}, ...]<\/span>\r\n\r\n<span class=\"hljs-keyword\">var<\/span> dogsWithOwners = []\r\n<span class=\"hljs-keyword\">var<\/span> dog, owner\r\n\r\n<span class=\"hljs-keyword\">for<\/span>(<span class=\"hljs-keyword\">var<\/span> di=<span class=\"hljs-number\">0<\/span>; di &lt; dogs.length; di++) {\r\n  dog = dogs[di]\r\n  <span class=\"hljs-keyword\">for<\/span>(<span class=\"hljs-keyword\">var<\/span> oi=<span class=\"hljs-number\">0<\/span>; oi &lt; owners.length; oi++) {\r\n    owner = owners[oi]\r\n    <span class=\"hljs-keyword\">if<\/span> (owner &amp;&amp; dog.owner_id == owner.id) {\r\n      dogsWithOwners.push({\r\n        <span class=\"hljs-attr\">dog<\/span>: dog,\r\n        <span class=\"hljs-attr\">owner<\/span>: owner\r\n      })\r\n    }\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u61c9\u8a72\u53ef\u4ee5\u5927\u81f4\u9ad4\u9a57\u51fa\u5169\u8005\u7684\u5dee\u5225\u5427\uff1f\u5f8c\u8005\u4f60\u5fc5\u9808\u81ea\u5df1\u4e00\u6b65\u6b65\u53bb\u6c7a\u5b9a\u8a72\u600e\u9ebc\u505a\uff0c\u800c\u524d\u8005\u53ea\u662f\u50c5\u50c5\u8ddf\u4f60\u8aaa\uff1a\u300c\u6211\u60f3\u8981\u600e\u6a23\u7684\u8cc7\u6599\u300d\u800c\u5df2\u3002<\/p>\n<p>\u63a5\u8457\u6211\u5011\u518d\u628a\u76ee\u5149\u653e\u56de\u5230\u628a\u6578\u5b57\u4e58\u4ee5\u4e8c\u76f8\u52a0\u7684\u90a3\u500b\u7df4\u7fd2\u3002\u5c0d\u6211\u4f86\u8aaa\uff0c\u6700\u5927\u7684\u4e0d\u540c\u9ede\u662f\u5f8c\u9762\u90a3\u500b\u7528\u9663\u5217\u642d\u914d\u51fd\u5f0f\u7684\u4f8b\u5b50\uff0c\u4ed6\u7684\u6838\u5fc3\u6982\u5ff5\u662f\uff1a<\/p>\n<blockquote><p>\u628a\u539f\u59cb\u8cc7\u6599\u7d93\u904e\u4e00\u9023\u4e32\u7684\u8f49\u63db\uff0c\u8b8a\u6210\u4f60\u60f3\u8981\u7684\u8cc7\u8a0a<\/p><\/blockquote>\n<p>\u9019\u9ede\u8d85\u7d1a\u91cd\u8981\uff0c\u56e0\u70ba\u5728\u4e00\u958b\u59cb\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u662f\u81ea\u5df1\u4e00\u6b65\u6b65\u53bb parse\uff0c\u53bb\u6aa2\u67e5\u53bb\u76f8\u52a0\uff0c\u5f97\u51fa\u6578\u5b57\u7684\u7e3d\u548c\u3002\u800c\u5f8c\u9762\u7684\u90a3\u500b\u4f8b\u5b50\uff0c\u4ed6\u662f\u628a\u539f\u59cb\u7684\u8cc7\u6599\uff08\u9663\u5217\uff09\uff0c\u7d93\u904e\u4e00\u7cfb\u5217\u7684\u8f49\u63db\uff08map, filter, reduce\uff09\uff0c\u6700\u5f8c\u8b8a\u6210\u4e86\u6211\u5011\u60f3\u8981\u7684\u7b54\u6848\u3002<\/p>\n<p>\u756b\u6210\u5716\u7684\u8a71\uff0c\u61c9\u8a72\u6703\u9577\u9019\u6a23\uff08\u8acb\u539f\u8ad2\u6211\u5077\u61f6\u628a\u4e58\u4e8c\u7684\u90e8\u5206\u62ff\u6389\u4e86\uff0c\u4f46\u610f\u601d\u4e0d\u5f71\u97ff\uff09\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/map.png\" alt=\"\" \/><\/p>\n<p>\u628a\u539f\u59cb\u8cc7\u6599\u7d93\u904e\u4e00\u9023\u4e32\u7684\u8f49\u63db\uff0c\u6700\u5f8c\u8b8a\u6210\u4f60\u60f3\u8981\u7684\u7b54\u6848\uff0c\u9019\u9ede\u5c31\u662f\u5f8c\u8005\u6700\u5927\u7684\u4e0d\u540c\u3002\u53ea\u8981\u4f60\u6709\u4e86\u9019\u500b\u57fa\u790e\u77e5\u8b58\u4e4b\u5f8c\uff0c\u518d\u4f86\u770b RxJS \u5c31\u4e0d\u6703\u89ba\u5f97\u592a\u5947\u602a\u4e86\u3002<\/p>\n<h1>Reactive Programming<\/h1>\n<p>\u8ac7\u5230 RxJS \u7684\u6642\u5019\uff0c\u90fd\u6703\u8ac7\u5230 Reactive \u9019\u500b\u8a5e\uff0c\u90a3\u4ec0\u9ebc\u662f Reactive \u5462\uff1f\u53ef\u4ee5\u5f9e\u82f1\u6587\u4e0a\u7684\u5b57\u7fa9\u4f86\u770b\uff0c\u9019\u500b\u55ae\u5b57\u7684\u610f\u601d\u662f\uff1a\u300c\u53cd\u61c9\u3001\u53cd\u61c9\u6027\u7684\u300d\uff0c\u610f\u601d\u5c31\u662f\u4f60\u8981\u5c0d\u4e00\u4e9b\u4e8b\u60c5\u505a\u51fa\u53cd\u61c9\u3002<\/p>\n<p>\u6240\u4ee5 Reactive \u5176\u5be6\u5c31\u662f\u5728\u8b1b\u8aaa\uff1a\u300c\u67d0\u4e9b\u4e8b\u60c5\u767c\u751f\u6642\uff0c\u6211\u80fd\u5920\u505a\u51fa\u53cd\u61c9\u300d\u3002<\/p>\n<p>\u8b93\u6211\u5011\u4f86\u8209\u4e00\u500b\u5927\u5bb6\u975e\u5e38\u719f\u77e5\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-built_in\">window<\/span>.addEventListener(<span class=\"hljs-string\">'click'<\/span>, <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>()<\/span>{\r\n  <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'click!'<\/span>);\r\n})\r\n<\/code><\/pre>\n<p>\u6211\u5011\u52a0\u4e86\u4e00\u500b event listener \u5728 window \u4e0a\u9762\uff0c\u6240\u4ee5\u6211\u5011\u53ef\u4ee5\u76e3\u807d\u5230\u9019\u500b\u4e8b\u4ef6\uff0c\u6bcf\u7576\u4f7f\u7528\u8005\u9ede\u64ca\u7684\u6642\u5019\u5c31\u5217\u5370\u51fa log\u3002\u63db\u53e5\u8a71\u8aaa\uff0c\u9019\u6a23\u5c31\u662f\uff1a\u300c\u7576 window \u88ab\u9ede\u64ca\u6642\uff0c\u6211\u53ef\u4ee5\u505a\u51fa\u53cd\u61c9\u300d\u3002<\/p>\n<h1>\u6b63\u5f0f\u9032\u5165 RxJS<\/h1>\n<p>\u5982\u679c\u4f60\u53bb\u770b\u00a0<a href=\"http:\/\/reactivex.io\/\" target=\"_blank\" rel=\"noopener noreferrer\">ReactiveX<\/a>\u00a0\u7684\u7db2\u9801\uff0c\u4f60\u6703\u767c\u73fe\u4ed6\u6709\u660e\u78ba\u7684\u5b9a\u7fa9 ReactiveX\uff1a<\/p>\n<blockquote><p>ReactiveX is a combination of the best ideas from<br \/>\nthe Observer pattern, the Iterator pattern, and functional programming<\/p><\/blockquote>\n<p>\u7b2c\u4e00\u500b Observer pattern \u5c31\u50cf\u662f event listener \u90a3\u6a23\uff0c\u5728\u67d0\u4e9b\u4e8b\u60c5\u767c\u751f\u6642\uff0c\u6211\u5011\u53ef\u4ee5\u5c0d\u5176\u4f5c\u51fa\u53cd\u61c9\uff1b\u7b2c\u4e8c\u500b Iterator pattern \u6211\u5011\u8df3\u904e\u4e0d\u8b1b\uff0c\u6211\u8a8d\u70ba\u66ab\u6642\u4e0d\u5f71\u97ff\u7406\u89e3\uff1b\u7b2c\u4e09\u500b\u5c31\u50cf\u662f\u4e00\u958b\u59cb\u7684\u4f8b\u5b50\uff0c\u6211\u5011\u53ef\u4ee5\u628a\u4e00\u500b\u9663\u5217\u7d93\u904e\u591a\u6b21\u8f49\u63db\uff0c\u8f49\u63db\u6210\u6211\u5011\u60f3\u8981\u7684\u8cc7\u6599\u3002<\/p>\n<p>\u5728 Reactive Programming \u88e1\u9762\uff0c\u6700\u91cd\u8981\u7684\u5169\u500b\u6771\u897f\u53eb\u505a Observable \u8ddf Observer\uff0c\u5176\u5be6\u4e00\u958b\u59cb\u8b93\u6211\u6700\u56f0\u60d1\u7684\u9ede\u662f\u56e0\u70ba\u6211\u82f1\u6587\u4e0d\u597d\uff0c\u4e0d\u77e5\u9053\u9019\u5169\u500b\u5230\u5e95\u8ab0\u662f\u89c0\u5bdf\u7684\u8ab0\u662f\u88ab\u89c0\u5bdf\u7684\u3002<\/p>\n<p>\u5148\u628a\u5b83\u5011\u7ffb\u6210\u4e2d\u6587\uff0cObservable \u5c31\u662f\u300c\u53ef\u88ab\u89c0\u5bdf\u7684\u300d\uff0cObserver \u5c31\u662f\u6240\u8b02\u7684\u300c\u89c0\u5bdf\u8005\u300d\u3002<\/p>\n<p>\u9019\u662f\u4ec0\u9ebc\u610f\u601d\u5462\uff1f\u5c31\u5982\u540c\u4e0a\u9762\u7684\u4f8b\u5b50\u4e00\u6a23\uff0c\u7576\uff08\u53ef\u88ab\u89c0\u5bdf\u7684\u6771\u897f\uff09\u6709\u4e8b\u60c5\u767c\u751f\uff0c\uff08Observer\uff0c\u89c0\u5bdf\u8005\uff09\u5c31\u53ef\u4ee5\u505a\u51fa\u53cd\u61c9\u3002<\/p>\n<p>\u76f4\u63a5\u8209\u4e00\u500b\u4f8b\u5b50\u4f60\u5c31\u77e5\u9053\u4e86\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(<span class=\"hljs-built_in\">window<\/span>, <span class=\"hljs-string\">'click'<\/span>)\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'click~'<\/span>);\r\n  })\r\n<\/code><\/pre>\n<p>\u4e0a\u9762\u9019\u6bb5\u7a0b\u5f0f\u78bc\u8ddf\u6211\u5e6b window \u52a0\u4e0a event listener \u5728\u505a\u7684\u4e8b\u60c5\u5b8c\u5168\u4e00\u6a23\uff0c\u53ea\u662f\u9019\u908a\u6211\u5011\u4f7f\u7528\u4e86 RxJS \u63d0\u4f9b\u7684\u65b9\u6cd5\u53eb\u505a<code>fromEvent<\/code>\uff0c\u4f86\u628a\u4e00\u500b event \u8f49\u6210 Observable\uff08\u53ef\u88ab\u89c0\u5bdf\u7684\uff09\uff0c\u4e26\u4e14\u5728\u6700\u5f8c\u52a0\u4e0a subscribe\u3002<\/p>\n<p>\u9019\u6a23\u5beb\u5c31\u4ee3\u8868\u8aaa\u6211\u8a02\u95b1\u4e86\u9019\u500b Observable\uff0c\u53ea\u8981\u6709\u4efb\u4f55\u4e8b\u60c5\u767c\u751f\uff0c\u5c31\u6703\u57f7\u884c\u6211\u50b3\u9032\u53bb\u7684 function\u3002<\/p>\n<p>\u6240\u4ee5\u5230\u5e95\u4ec0\u9ebc\u662f Observable\uff1f<\/p>\n<p>Observable \u5c31\u662f\u4e00\u500b\u53ef\u88ab\u89c0\u5bdf\u7684\u5c0d\u8c61\uff0c\u9019\u500b\u5c0d\u8c61\u53ef\u4ee5\u662f\u4efb\u4f55\u6771\u897f\uff08\u4f8b\u5982\u8aaa\u4e0a\u8ff0\u4f8b\u5b50\u5c31\u662f window \u7684 click \u4e8b\u4ef6\uff09\uff0c\u7576\u6709\u65b0\u8cc7\u6599\u7684\u6642\u5019\uff08\u4f8b\u5982\u8aaa\u65b0\u7684\u9ede\u64ca\u4e8b\u4ef6\uff09\uff0c\u4f60\u5c31\u53ef\u4ee5\u63a5\u6536\u5230\u9019\u500b\u65b0\u8cc7\u6599\u7684\u8cc7\u8a0a\u4e26\u4e14\u505a\u51fa\u53cd\u61c9\u3002<\/p>\n<p>\u6bd4\u8d77 Observable \u9019\u500b\u51b7\u51b0\u51b0\u7684\u8aaa\u6cd5\uff0c\u6211\u66f4\u559c\u6b61\u7684\u4e00\u500b\u8aaa\u6cd5\u662f stream\uff0c\u8cc7\u6599\u6d41\u3002\u5176\u5be6\u6bcf\u4e00\u500b Observable \u5c31\u662f\u4e00\u500b\u8cc7\u6599\u6d41\uff0c\u4f46\u4ec0\u9ebc\u662f\u8cc7\u6599\u6d41\uff1f\u4f60\u5c31\u60f3\u50cf\u6210\u662f\u6703\u4e00\u76f4\u589e\u52a0\u5143\u7d20\u7684\u9663\u5217\u5c31\u597d\u4e86\uff0c\u6709\u65b0\u7684\u4e8b\u4ef6\u767c\u751f\u5c31 push \u9032\u53bb\u3002\u5982\u679c\u4f60\u559c\u6b61\u66f4\u5c08\u696d\u4e00\u9ede\u7684\u8aaa\u6cd5\uff0c\u53ef\u4ee5\u53eb\u5b83\uff1a\u300c\u6642\u9593\u5e8f\u5217\u4e0a\u7684\u4e00\u9023\u4e32\u8cc7\u6599\u4e8b\u4ef6\u300d\uff08\u53d6\u81ea\u00a0<a href=\"http:\/\/blog.techbridge.cc\/2016\/05\/28\/reactive-programming-intro-by-rxjs\/\">Reactive Programming \u7c21\u4ecb\u8207\u6559\u5b78(\u4ee5 RxJS \u70ba\u4f8b)<\/a>\uff09<\/p>\n<p>\u6216\u662f\u6211\u518d\u8209\u4e00\u500b\u4f8b\u5b50\uff0cstream \u7684\u53e6\u5916\u4e00\u500b\u89e3\u91cb\u5c31\u662f\u6240\u8b02\u7684\u300c\u4e32\u6d41\u5f71\u7247\u300d\uff0c\u610f\u601d\u5c31\u662f\u96a8\u8457\u4f60\u4e0d\u65b7\u64ad\u653e\uff0c\u5c31\u6703\u4e0d\u65b7\u4e0b\u8f09\u65b0\u7684\u7247\u6bb5\u9032\u4f86\u3002\u6b64\u6642\u4f60\u8166\u4e2d\u61c9\u8a72\u8981\u6709\u500b\u756b\u9762\uff0c\u5c31\u662f\u50cf\u6c34\u6d41\u90a3\u6a23\uff0c\u4e0d\u65b7\u6709\u65b0\u7684\u6771\u897f\u6d41\u9032\u4f86\uff0c\u9019\u500b\u6771\u897f\u5c31\u53eb\u505a stream\u3002<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/media.giphy.com\/media\/xIkKIodaqNBdK\/giphy.gif\" alt=\"\" \/><br \/>\n\uff08\u5716\u7247\u53d6\u81ea\u00a0<a href=\"https:\/\/media.giphy.com\/media\/xIkKIodaqNBdK\/giphy.gif\" target=\"_blank\" rel=\"noopener noreferrer\">giphy<\/a>\uff09<\/p>\n<h1>\u6211\u7406\u89e3\u8cc7\u6599\u6d41\u4e86\uff0c\u7136\u5f8c\u5462\uff1f<\/h1>\n<p>\u4e0a\u9762\u6709\u8aaa\u904e\uff0c\u6211\u5011\u53ef\u4ee5\u628a\u4efb\u4f55\u4e00\u500b\u6771\u897f\u8f49\u6210 Observable\uff0c\u8b93\u5b83\u8b8a\u6210\u8cc7\u6599\u6d41\uff0c\u53ef\u662f\u9019\u4e0d\u5c31\u8ddf addEventListener \u4e00\u6a23\u55ce\uff1f\u6709\u4ec0\u9ebc\u7279\u5225\u7684\uff1f<\/p>\n<p>\u6709\uff0c\u9084\u771f\u7684\u6bd4\u8f03\u7279\u5225\u3002<\/p>\n<p>\u5e0c\u671b\u4f60\u6c92\u6709\u5fd8\u8a18\u6211\u5011\u525b\u958b\u59cb\u505a\u7684\u90a3\u500b\u5c0f\u7df4\u7fd2\uff0c\u5c31\u662f\u628a\u4e00\u500b\u9663\u5217\u900f\u904e\u4e00\u7cfb\u5217\u8f49\u63db\uff0c\u8b8a\u6210\u6211\u5011\u8981\u7684\u8cc7\u6599\u7684\u90a3\u500b\u7df4\u7fd2\u3002\u6211\u525b\u525b\u6709\u8aaa\uff0c\u4f60\u53ef\u4ee5\u628a Observable \u60f3\u6210\u662f\u300c\u6703\u4e00\u76f4\u589e\u52a0\u5143\u7d20\u7684\u9663\u5217\u300d\uff0c\u9019\u4ee3\u8868\u4ec0\u9ebc\u5462\uff1f<\/p>\n<p>\u4ee3\u8868\u6211\u5011\u4e5f\u53ef\u4ee5\u628a Observable \u505a\u4e00\u7cfb\u5217\u7684\u8f49\u63db\uff01\u6211\u5011\u4e5f\u53ef\u4ee5\u7528\u90a3\u4e9b\u7528\u5728\u9663\u5217\u4e0a\u7684 function\uff01<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(<span class=\"hljs-built_in\">window<\/span>, <span class=\"hljs-string\">'click'<\/span>)\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> e.target)\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'click: '<\/span>, value)\r\n  })\r\n<\/code><\/pre>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/click.gif\" alt=\"\" \/><\/p>\n<p>\u6211\u5011\u628a click \u4e8b\u4ef6\u7d93\u904e map \u8f49\u63db\u70ba\u9ede\u64ca\u5230\u7684 element\uff0c\u6240\u4ee5\u7576\u6211\u5011\u6700\u5f8c\u5728 subscribe \u7684\u6642\u5019\uff0c\u6536\u5230\u7684 value \u5c31\u6703\u662f\u6211\u5011\u9ede\u64ca\u7684\u6771\u897f\u3002<\/p>\n<p>\u63a5\u8457\u4f86\u770b\u4e00\u500b\u7a0d\u5fae\u9032\u968e\u4e00\u9ede\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(<span class=\"hljs-built_in\">window<\/span>, <span class=\"hljs-string\">'click'<\/span>)\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> <span class=\"hljs-number\">1<\/span>)\r\n  .scan(<span class=\"hljs-function\">(<span class=\"hljs-params\">total, now<\/span>) =&gt;<\/span> total + now)\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'#counter'<\/span>).innerText = value;\r\n  })\r\n<\/code><\/pre>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/counter.gif\" alt=\"\" \/><\/p>\n<p>\u9996\u5148\u6211\u5011\u5148\u628a\u6bcf\u4e00\u500b click \u4e8b\u4ef6\u90fd\u900f\u904e<code>map<\/code>\u8f49\u63db\u6210 1\uff08\u6216\u8005\u4f60\u4e5f\u53ef\u4ee5\u5beb\u6210<code>.mapTo(1)<\/code>\uff09\uff0c\u6240\u4ee5\u6bcf\u6309\u4e00\u6b21\u5c31\u9001\u51fa\u4e00\u500b\u6578\u5b57 1\u3002<code>scan<\/code>\u7684\u8a71\u5176\u5be6\u5c31\u662f\u6211\u5011\u4e00\u958b\u59cb\u5c0d\u9663\u5217\u7528\u7684<code>reduce<\/code>\uff0c\u4f60\u53ef\u4ee5\u60f3\u6210\u662f\u63db\u500b\u540d\u5b57\u800c\u5df2\u3002\u900f\u904e<code>scan<\/code>\u52a0\u7e3d\u4ee5\u5f8c\u50b3\u7d66 subscriber\uff0c\u986f\u793a\u5728\u9801\u9762\u4e0a\u9762\u3002<\/p>\n<p>\u5c31\u9019\u6a23\u7c21\u55ae\u5e7e\u884c\uff0c\u5c31\u5b8c\u6210\u4e86\u4e00\u500b\u8a08\u7b97\u9ede\u64ca\u6b21\u6578\u7684 counter\u3002<\/p>\n<p>\u53ef\u4ee5\u7528\u4e00\u500b\u7c21\u55ae\u7684 gif \u5716\u4f86\u8868\u793a\u4e0a\u9762\u7684\u7bc4\u4f8b\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/click_stream.gif\" alt=\"\" \/><\/p>\n<p>\u53ef\u662f Observable \u4e0d\u53ea\u9019\u6a23\u800c\u5df2\uff0c\u63a5\u4e0b\u4f86\u6211\u5011\u8981\u9032\u5165\u5230\u5b83\u6700\u53b2\u5bb3\u7684\u5730\u65b9\u4e86\u3002<\/p>\n<h1>\u5a01\u529b\u7121\u7aae\u7684\u7d44\u5408\u6280<\/h1>\n<p>\u5982\u679c\u628a\u5169\u500b\u9663\u5217\u5408\u4f75\uff0c\u6703\u8b8a\u6210\u4ec0\u9ebc\uff1f\u4f8b\u5982\u8aaa<code>[1, 2, 3]<\/code>\u8ddf<code>[4, 5, 6]<\/code>\uff1f<\/p>\n<p>\u9019\u8981\u770b\u4f60\u6307\u7684\u300c\u5408\u4f75\u300d\u662f\u4ec0\u9ebc\uff0c\u5982\u679c\u662f\u6307\u4e32\u63a5\uff0c\u90a3\u5c31\u662f<code>[1, 2, 3, 4, 5, 6]<\/code>\uff0c\u5982\u679c\u662f\u6307\u76f8\u52a0\uff0c\u90a3\u5c31\u662f<code>[5, 7, 9]<\/code>\u3002<\/p>\n<p>\u90a3\u5982\u679c\u628a\u5169\u500b Observable \u5408\u4f75\u6703\u8b8a\u6210\u4ec0\u9ebc\uff1f<\/p>\n<p>Observable \u8ddf\u9663\u5217\u7684\u5dee\u5225\u5c31\u5728\u65bc\u591a\u4e86\u4e00\u500b\u7dad\u5ea6\uff1a\u6642\u9593\u3002<\/p>\n<p>Observable \u662f\u300c\u6642\u9593\u5e8f\u5217\u4e0a\u7684\u4e00\u9023\u4e32\u8cc7\u6599\u4e8b\u4ef6\u300d\uff0c\u5c31\u50cf\u6211\u524d\u9762\u8b1b\u7684\u4e00\u6a23\uff0c\u53ef\u4ee5\u770b\u6210\u662f\u4e00\u500b\u4e00\u76f4\u6703\u6709\u65b0\u8cc7\u6599\u9032\u4f86\u7684\u9663\u5217\u3002<\/p>\n<p>\u6211\u5011\u5148\u4f86\u770b\u770b\u4e00\u5f35\u5f88\u68d2\u7684\u5716\uff0c\u5f88\u6e05\u695a\u5730\u89e3\u91cb\u4e86\u5169\u500b Observable \u5408\u4f75\u6703\u8b8a\u6210\u4ec0\u9ebc\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/merge.png\" alt=\"\" \/><br \/>\n\uff08\u53d6\u81ea\uff1a<a href=\"http:\/\/rxmarbles.com\/#merge%EF%BC%89\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/rxmarbles.com\/#merge\uff09<\/a><\/p>\n<p>\u4e0a\u9762\u662f\u4e00\u500b Observable\uff0c\u6bcf\u4e00\u500b\u5713\u9ede\u4ee3\u8868\u4e00\u500b\u8cc7\u6599\uff0c\u4e0b\u9762\u4e5f\u662f\u4e00\u6a23\uff0c\u628a\u9019\u5169\u500b\u5408\u4f75\u4e4b\u5f8c\u5c31\u8b8a\u6210\u6700\u4e0b\u9762\u90a3\u4e00\u689d\uff0c\u770b\u5716\u89e3\u61c9\u8a72\u9084\u6eff\u597d\u61c2\u7684\uff0c\u5c31\u50cf\u662f\u628a\u5169\u500b\u6642\u9593\u8ef8\u5408\u4f75\u4e00\u6a23\u3002<\/p>\n<p>\u8b93\u6211\u5011\u4f86\u770b\u4e00\u500b\u53ef\u4ee5\u5c55\u73fe\u5408\u4f75\u5f37\u5927\u4e4b\u8655\u7684\u7bc4\u4f8b\uff0c\u6211\u5011\u6709 +1 \u8ddf -1 \u5169\u500b\u6309\u9215\u4ee5\u53ca\u6587\u5b57\u986f\u793a\u73fe\u5728\u7684\u6578\u5b57\u662f\u591a\u5c11\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/counter_adv.gif\" alt=\"\" \/><\/p>\n<p>\u8a72\u600e\u9ebc\u9054\u6210\u9019\u500b\u529f\u80fd\u5462\uff1f\u57fa\u672c\u7684\u60f3\u6cd5\u5c31\u662f\u6211\u5011\u5148\u628a\u6bcf\u500b +1 \u7684 click \u4e8b\u4ef6\u90fd\u901a\u904e<code>mapTo<\/code>\u8b8a\u6210\u6578\u5b57 1\uff0c\u53d6\u53eb Observable_plus1 \u597d\u4e86\u3002\u518d\u505a\u51fa\u4e00\u500b Observable_minus1 \u662f\u628a\u6bcf\u500b -1 \u7684 click \u4e8b\u4ef6\u90fd\u901a\u904e<code>mapTo<\/code>\u8b8a\u6210\u6578\u5b57 -1\u3002<\/p>\n<p>\u628a\u9019\u5169\u500b Observable \u5408\u4f75\u4e4b\u5f8c\uff0c\u518d\u5229\u7528\u525b\u525b\u63d0\u5230\u7684<code>scan<\/code>\u52a0\u7e3d\uff0c\u5c31\u662f\u76ee\u524d\u61c9\u8a72\u8981\u986f\u793a\u7684\u6578\u5b57\u4e86\uff01<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'input[name=plus]'<\/span>), <span class=\"hljs-string\">'click'<\/span>)\r\n  .mapTo(<span class=\"hljs-number\">1<\/span>)\r\n  .merge(\r\n    Rx.Observable.fromEvent(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'input[name=minus]'<\/span>), <span class=\"hljs-string\">'click'<\/span>)\r\n      .mapTo(<span class=\"hljs-number\">-1<\/span>)\r\n  )\r\n  .scan(<span class=\"hljs-function\">(<span class=\"hljs-params\">total, now<\/span>) =&gt;<\/span> total + now)\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'#counter'<\/span>).innerText = value;\r\n  })\r\n<\/code><\/pre>\n<p>\u5982\u679c\u4f60\u9084\u662f\u4e0d\u61c2\u7684\u8a71\uff0c\u53ef\u4ee5\u53c3\u8003\u4e0b\u9762\u7684\u7cbe\u7f8e\u7bc4\u4f8b\uff0c\u793a\u7bc4\u9019\u5169\u500b Observable \u662f\u600e\u9ebc\u5408\u5728\u4e00\u8d77\u7684\uff08<code>O<\/code>\u4ee3\u8868\u9ede\u64ca\u4e8b\u4ef6\uff0c<code>+1<\/code>\u8ddf<code>-1<\/code>\u5247\u662f<code>mapTo<\/code>\u4e4b\u5f8c\u7684\u7d50\u679c\uff09\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/plus.gif\" alt=\"\" \/><\/p>\n<p>\u8b93\u6211\u5011\u4f86\u6bd4\u8f03\u4e00\u4e0b\u5982\u679c\u4e0d\u7528 Observable \u7684\u8a71\uff0c\u7a0b\u5f0f\u78bc\u6703\u9577\u600e\u6a23\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-keyword\">var<\/span> total = <span class=\"hljs-number\">0<\/span>;\r\n<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'input[name=plus]'<\/span>).addEventListener(<span class=\"hljs-string\">'click'<\/span>, () =&gt; {\r\n  total++;\r\n  <span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'#counter'<\/span>).innerText = total;\r\n})\r\n\r\n<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'input[name=minus]'<\/span>).addEventListener(<span class=\"hljs-string\">'click'<\/span>, () =&gt; {\r\n  total--;\r\n  <span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'#counter'<\/span>).innerText = total;\r\n})\r\n<\/code><\/pre>\n<p>\u6709\u6c92\u6709\u767c\u89ba\u5169\u8005\u771f\u7684\u5dee\u5225\u5f88\u5927\uff1f\u5c31\u5982\u540c\u6211\u4e4b\u524d\u6240\u8aaa\u7684\uff0c\u662f\u5169\u7a2e\u5b8c\u5168\u4e0d\u540c\u7684\u601d\u8003\u6a21\u5f0f\uff0c\u6240\u4ee5 Reactive Programming \u56f0\u96e3\u7684\u5730\u65b9\u4e0d\u662f\u5728\u65bc\u7406\u89e3\uff0c\u4e5f\u4e0d\u662f\u5728\u65bc\u8a9e\u6cd5\uff08\u9019\u5169\u8005\u76f8\u4fe1\u4f60\u76ee\u524d\u90fd\u6709\u4e9b\u6982\u5ff5\u4e86\uff09\uff0c\u800c\u662f\u5728\u65bc\u63db\u4e00\u7a2e\u5168\u65b0\u7684\u601d\u8003\u6a21\u5f0f\u3002<\/p>\n<p>\u4ee5\u4e0a\u9762\u7684\u5beb\u6cd5\u4f86\u8aaa\uff0c\u5c31\u662f\u544a\u8a34\u96fb\u8166\uff1a\u300c\u6309\u4e0b\u52a0\u7684\u6642\u5019\u5c31\u628a\u4e00\u500b\u8b8a\u6578 +1\uff0c\u7136\u5f8c\u66f4\u6539\u6587\u5b57\uff1b\u6309\u4e0b\u6e1b\u7684\u6642\u5019\u5c31 -1 \u4e26\u4e14\u4e5f\u66f4\u6539\u6587\u5b57\u300d\uff0c\u5c31\u53ef\u4ee5\u9054\u6210\u8a08\u6578\u5668\u7684\u529f\u80fd\u3002<\/p>\n<p>\u4ee5 Reactive \u7684\u5beb\u6cd5\uff0c\u5c31\u662f\u628a\u6309\u4e0b\u52a0\u7576\u6210\u4e00\u500b\u8cc7\u6599\u6d41\uff0c\u628a\u6309\u4e0b\u6e1b\u4e5f\u7576\u6210\u4e00\u500b\u8cc7\u6599\u6d41\uff0c\u518d\u900f\u904e\u5404\u7a2e function \u628a\u9019\u5169\u500b\u6d41\u8f49\u63db\u4e26\u4e14\u5408\u4f75\u8d77\u4f86\uff0c\u8b93\u6700\u5f8c\u7684\u90a3\u500b\u6d41\u5c31\u662f\u6211\u5011\u60f3\u8981\u7684\u7d50\u679c\uff08\u8a08\u6578\u5668\uff09\u3002<\/p>\n<p>\u4f60\u73fe\u5728\u61c9\u8a72\u80fd\u9ad4\u6703\u5230\u6211\u4e00\u958b\u59cb\u8aaa\u7684\u4e86\uff1a\u300c\u628a\u539f\u59cb\u8cc7\u6599\u7d93\u904e\u4e00\u9023\u4e32\u7684\u8f49\u63db\uff0c\u6700\u5f8c\u8b8a\u6210\u4f60\u60f3\u8981\u7684\u7b54\u6848\u300d\uff0c\u9019\u9ede\u5c31\u662f Reactive Programming \u6700\u5927\u7684\u7279\u8272\u3002<\/p>\n<h1>\u7d44\u5408\u6280\u4e2d\u7684\u7d44\u5408\u6280<\/h1>\n<p>\u6211\u5011\u4f86\u770b\u4e00\u500b\u66f4\u8907\u96dc\u4e00\u9ede\u7684\u7bc4\u4f8b\uff0c\u662f\u5728 canvas \u4e0a\u9762\u5be6\u73fe\u975e\u5e38\u7c21\u55ae\u7684\u7e6a\u5716\u529f\u80fd\uff0c\u5c31\u662f\u6ed1\u9f20\u6309\u4e0b\u53bb\u4e4b\u5f8c\u53ef\u4ee5\u756b\u756b\uff0c\u653e\u958b\u4f86\u5c31\u505c\u6b62\u3002<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/draw.gif\" alt=\"\" \/><\/p>\n<p>\u8981\u5be6\u73fe\u9019\u500b\u529f\u80fd\u5f88\u9593\u55ae\uff0ccanvas \u63d0\u4f9b<code>lineTo(x, y)<\/code>\u9019\u500b\u65b9\u6cd5\uff0c\u53ea\u8981\u5728\u6ed1\u9f20\u79fb\u52d5\u6642\u4e0d\u65b7\u547c\u53eb\u9019\u500b\u65b9\u6cd5\uff0c\u5c31\u53ef\u4ee5\u4e0d\u65b7\u756b\u51fa\u5716\u5f62\u4f86\u3002\u4f46\u6709\u4e00\u9ede\u8981\u6ce8\u610f\u7684\u662f\u7576\u4f60\u5728\u6309\u4e0b\u6ed1\u9f20\u6642\uff0c\u61c9\u8a72\u5148\u547c\u53eb<code>moveTo(x, y)<\/code>\u628a\u7e6a\u5716\u7684\u9ede\u79fb\u5230\u6307\u5b9a\u4f4d\u7f6e\uff0c\u70ba\u4ec0\u9ebc\u5462\uff1f<\/p>\n<p>\u5047\u8a2d\u6211\u5011\u7b2c\u4e00\u6b21\u756b\u5716\u662f\u5728\u5de6\u4e0a\u89d2\uff0c\u7b2c\u4e8c\u6b21\u6309\u4e0b\u6ed1\u9f20\u7684\u4f4d\u7f6e\u662f\u5728\u53f3\u4e0b\u89d2\uff0c\u5982\u679c\u6c92\u6709\u5148\u7528<code>moveTo<\/code>\u79fb\u52d5\u800c\u662f\u76f4\u63a5\u7528<code>lineTo<\/code>\u7684\u8a71\uff0c\u5c31\u6703\u591a\u4e00\u689d\u7dda\u5f9e\u5de6\u4e0a\u89d2\u5ef6\u4f38\u5230\u53f3\u4e0b\u89d2\u3002<code>moveTo<\/code>\u8ddf<code>lineTo<\/code>\u7684\u5dee\u5225\u5c31\u662f\u524d\u8005\u53ea\u662f\u79fb\u52d5\uff0c\u5f8c\u8005\u6703\u8ddf\u4e0a\u6b21\u7684\u9ede\u9023\u63a5\u5728\u4e00\u8d77\u756b\u6210\u4e00\u689d\u7dda\u3002<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/draw2.gif\" alt=\"\" \/><\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-keyword\">var<\/span> canvas = <span class=\"hljs-built_in\">document<\/span>.getElementById(<span class=\"hljs-string\">'canvas'<\/span>);\r\n<span class=\"hljs-keyword\">var<\/span> ctx = canvas.getContext(<span class=\"hljs-string\">'2d'<\/span>);\r\nctx.beginPath(); <span class=\"hljs-comment\">\/\/ \u958b\u59cb\u756b\u756b<\/span>\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">draw<\/span>(<span class=\"hljs-params\">e<\/span>)<\/span>{\r\n  ctx.lineTo(e.clientX,e.clientY); <span class=\"hljs-comment\">\/\/ \u79fb\u5230\u6ed1\u9f20\u5728\u7684\u4f4d\u7f6e<\/span>\r\n  ctx.stroke(); <span class=\"hljs-comment\">\/\/ \u756b\u756b<\/span>\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u6309\u4e0b\u53bb\u6ed1\u9f20\u624d\u958b\u59cb\u5075\u6e2c mousemove \u4e8b\u4ef6<\/span>\r\ncanvas.addEventListener(<span class=\"hljs-string\">'mousedown'<\/span>, <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">e<\/span>)<\/span>{\r\n  ctx.moveTo(e.clientX, e.clientY); <span class=\"hljs-comment\">\/\/ \u6bcf\u6b21\u6309\u4e0b\u7684\u6642\u5019\u5fc5\u9808\u8981\u5148\u628a\u7e6a\u5716\u7684\u9ede\u79fb\u5230\u90a3\u908a\uff0c\u5426\u5247\u6703\u53d7\u4e0a\u6b21\u756b\u7684\u4f4d\u7f6e\u5f71\u97ff<\/span>\r\n  canvas.addEventListener(<span class=\"hljs-string\">'mousemove'<\/span>, draw);\r\n})\r\n\r\n<span class=\"hljs-comment\">\/\/ \u653e\u958b\u6ed1\u9f20\u5c31\u505c\u6b62\u5075\u6e2c <\/span>\r\ncanvas.addEventListener(<span class=\"hljs-string\">'mouseup'<\/span>, <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">e<\/span>)<\/span>{\r\n  canvas.removeEventListener(<span class=\"hljs-string\">'mousemove'<\/span>, draw);\r\n})\r\n<\/code><\/pre>\n<p>\u90a3\u5982\u679c\u5728 RxJS \u88e1\u9762\uff0c\u8a72\u600e\u9ebc\u5be6\u4f5c\u9019\u500b\u529f\u80fd\u5462\uff1f<\/p>\n<p>\u9996\u5148\u6191\u76f4\u89ba\uff0c\u61c9\u8a72\u5c31\u662f\u5148\u52a0\u4e0a<code>mousedown<\/code>\u7684\u4e8b\u4ef6\u5c0d\u5427\uff01\u81f3\u5c11\u6709\u500b\u958b\u982d\u3002<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousedown'<\/span>)\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'mousedown'<\/span>);\r\n  })\r\n<\/code><\/pre>\n<p>\u53ef\u662f\u6ed1\u9f20\u6309\u4e0b\u53bb\u4e4b\u5f8c\u61c9\u8a72\u8981\u8b8a\u6210\u4ec0\u9ebc\uff1f\u9019\u500b\u6642\u5019\u61c9\u8a72\u8981\u958b\u59cb\u76e3\u807d<code>mousemove<\/code>\u5c0d\u5427\uff0c\u6240\u4ee5\u6211\u5011\u9019\u6a23\u5beb\uff0c\u7528<code>mapTo<\/code>\u628a\u6bcf\u4e00\u500b<code>mousedown<\/code>\u7684\u4e8b\u4ef6\u90fd\u8f49\u63db\u6210<code>mousemove<\/code>\u7684 Observable\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousedown'<\/span>)\r\n  .mapTo(\r\n    Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousemove'<\/span>)\r\n  )\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'value: '<\/span>, value);\r\n  })\r\n<\/code><\/pre>\n<p>\u63a5\u8457\u4f60\u770b\u4e00\u4e0b console\uff0c\u4f60\u6703\u767c\u73fe\u6bcf\u7576\u6211\u9ede\u64ca\u7684\u6642\u5019\uff0cconsole \u5c31\u6703\u5370\u51fa<code>FromEventObservable {_isScalar: false, sourceObj: canvas#canvas, eventName: \"mousemove\", selector: undefined, options: undefined}<\/code><\/p>\n<p>\u4ed4\u7d30\u60f3\u4e00\u4e0b\u4f60\u6703\u767c\u73fe\u4e5f\u6eff\u5408\u7406\u7684\uff0c\u56e0\u70ba\u6211\u7528<code>mapTo<\/code>\u628a\u6bcf\u4e00\u500b\u6ed1\u9f20\u6309\u4e0b\u53bb\u7684\u4e8b\u4ef6\u8f49\u6210\u4e00\u500b mousemove \u7684 Observable\uff0c\u6240\u4ee5\u7528 subscribe \u8a02\u95b1\u4e4b\u5f8c\u62ff\u5230\u7684\u6771\u897f\u5c31\u6703\u662f\u9019\u500b Observable\u3002\u5982\u679c\u756b\u6210\u5716\uff0c\u5927\u6982\u9577\u5f97\u50cf\u9019\u6a23\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/flat.png\" alt=\"\" \/><\/p>\n<p>\u597d\u4e86\uff0c\u90a3\u600e\u9ebc\u8fa6\u5462\uff1f\u6211\u60f3\u8981\u7684\u5176\u5be6\u4e0d\u662f Observable \u672c\u8eab\uff0c\u800c\u662f\u5c6c\u65bc\u9019\u500b Observable \u88e1\u9762\u7684\u90a3\u4e9b\u6771\u897f\u554a\uff01\u73fe\u5728\u9019\u500b\u60c5\u5f62\u5c31\u662f Observable \u88e1\u9762\u53c8\u6709 Observable\uff0c\u6709\u5169\u5c64\uff0c\u53ef\u662f\u6211\u60f3\u8981\u8b93\u5b83\u8b8a\u6210\u4e00\u5c64\u5c31\u597d\uff0c\u8a72\u600e\u9ebc\u8fa6\u5462\uff1f<\/p>\n<p>\u5728\u6b64\u63d0\u4f9b\u4e00\u500b\u8b93 Observable \u8b8a\u7c21\u55ae\u7684\u8a23\u7ac5\uff1a<\/p>\n<blockquote><p>\u53ea\u8981\u6709\u554f\u984c\uff0c\u5148\u60f3\u60f3 Array \u5c31\u5c0d\u4e86\uff01<\/p><\/blockquote>\n<p>\u6211\u524d\u9762\u6709\u63d0\u904e\uff0c\u53ef\u4ee5\u628a Observable \u770b\u6210\u662f\u52a0\u4e0a\u6642\u9593\u7dad\u5ea6\u7684\u9032\u968e\u7248\u9663\u5217\uff0c\u56e0\u6b64\u53ea\u8981\u662f\u9663\u5217\u6709\u7684\u65b9\u6cd5\uff0cObservable \u901a\u5e38\u4e5f\u90fd\u6703\u6709\u3002<\/p>\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u4e00\u500b\u9663\u5217\u53ef\u80fd\u9577\u9019\u6a23\uff1a<code>[1, [2, 2.5], 3, [4, 5]]<\/code>\u4e00\u5171\u6709\u5169\u5c64\uff0c\u7b2c\u4e8c\u5c64\u4e5f\u662f\u4e00\u500b\u9663\u5217\u3002<\/p>\n<p>\u5982\u679c\u60f3\u8b93\u5b83\u8b8a\u4e00\u5c64\u7684\u8a71\u600e\u9ebc\u8fa6\u5462\uff1f\u58d3\u5e73\uff01<\/p>\n<p>\u6709\u7528\u904e lodash \u6216\u662f\u5176\u4ed6\u985e\u4f3c\u7684 library \u7684\u8a71\uff0c\u4f60\u61c9\u8a72\u6709\u807d\u904e<code>_.flatten<\/code>\u9019\u500b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u628a\u9019\u7a2e\u9663\u5217\u58d3\u5e73\uff0c\u8b8a\u6210\uff1a<code>[1, 2, 2.5, 3, 4, 5]<\/code>\u3002<\/p>\n<p>\u7528 flat \u9019\u500b\u95dc\u9375\u5b57\u53bb\u641c\u5c0b Rx \u6587\u4ef6\u7684\u8a71\uff0c\u4f60\u6703\u627e\u5230\u4e00\u500b\u65b9\u6cd5\u53eb\u505a\u00a0<a href=\"http:\/\/reactivex.io\/documentation\/operators\/flatmap.html\" target=\"_blank\" rel=\"noopener noreferrer\">FlatMap<\/a>\uff0c\u7c21\u55ae\u4f86\u8aaa\u5c31\u662f\u5148<code>map<\/code>\u4e4b\u5f8c\u518d\u81ea\u52d5\u5e6b\u4f60\u58d3\u5e73\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u6211\u5011\u53ef\u4ee5\u628a\u7a0b\u5f0f\u78bc\u6539\u6210\u9019\u6a23\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousedown'<\/span>)\r\n  .flatMap(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousemove'<\/span>))            \r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(e);\r\n  })\r\n<\/code><\/pre>\n<p>\u7576\u4f60\u9ede\u64ca\u4e4b\u5f8c\uff0c\u6703\u767c\u73fe\u96a8\u8457\u6ed1\u9f20\u79fb\u52d5\uff0cconsole \u6703\u5370\u51fa\u4e00\u5927\u5806 log\uff0c\u5c31\u4ee3\u8868\u6211\u5011\u6210\u529f\u4e86\u3002<\/p>\n<p>\u756b\u6210\u793a\u610f\u5716\u7684\u8a71\u6703\u8b8a\u6210\u9019\u6a23\uff08\u70ba\u4e86\u65b9\u4fbf\u8aaa\u660e\uff0c\u6211\u628a<code>flatMap<\/code>\u5728\u5716\u7247\u4e0a\u8b8a\u6210<code>map<\/code>\u8ddf<code>flatten<\/code>\u5169\u500b\u6b65\u9a5f\uff09\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/flat2.png\" alt=\"\" \/><\/p>\n<p>\u63a5\u4e0b\u4f86\u5462\uff1f\u63a5\u4e0b\u4f86\u6211\u5011\u8981\u8b93\u5b83\u53ef\u4ee5\u5728\u6ed1\u9f20\u9b06\u958b\u7684\u6642\u5019\u505c\u6b62\uff0c\u8a72\u600e\u9ebc\u505a\u5462\uff1fRxJS \u6709\u4e00\u500b\u65b9\u6cd5\u53eb\u505a<code>takeUntil<\/code>\uff0c\u610f\u601d\u5c31\u662f\u62ff\u5230&#8230;\u767c\u751f\u70ba\u6b62\uff0c\u50b3\u9032\u53bb\u7684\u53c3\u6578\u5fc5\u9808\u662f\u4e00\u500b Observable\u3002<\/p>\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u5982\u679c\u5beb<code>.takeUntil(window, 'click')<\/code>\uff0c\u5c31\u8868\u793a\u5982\u679c\u4efb\u4f55<code>window<\/code>\u7684\u9ede\u64ca\u4e8b\u4ef6\u767c\u751f\uff0c\u9019\u500b Observable \u5c31\u6703\u7acb\u523b\u7d42\u6b62\uff0c\u4e0d\u6703\u518d\u9001\u51fa\u4efb\u4f55\u8cc7\u6599\u3002<\/p>\n<p>\u61c9\u7528\u5728\u7e6a\u756b\u7684\u4f8b\u5b50\u4e0a\uff0c\u6211\u5011\u53ea\u8981\u628a<code>takeUntil<\/code>\u5f8c\u9762\u50b3\u7684\u53c3\u6578\u63db\u6210\u6ed1\u9f20\u9b06\u958b\u5c31\u597d\uff01\u9806\u4fbf\u628a<code>subscribe<\/code>\u8ddf\u756b\u756b\u7684 function \u4e5f\u4e00\u8d77\u5b8c\u6210\u5427\uff01<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousedown'<\/span>)\r\n  .flatMap(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousemove'<\/span>))\r\n  .takeUntil(Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mouseup'<\/span>))         \r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> {\r\n    draw(e);\r\n  })\r\n<\/code><\/pre>\n<p>\u6539\u5b8c\u4e4b\u5f8c\u99ac\u4e0a\u4f86\u5be6\u9a57\u4e00\u4e0b\uff01\u6ed1\u9f20\u6309\u4e0b\u53bb\u4e4b\u5f8c\u9806\u5229\u958b\u59cb\u756b\u5716\uff0c\u9b06\u958b\u4ee5\u5f8c\u756b\u5716\u505c\u6b62\uff0c\u5b8c\u7f8e\uff01<\/p>\n<p>\u54a6\uff0c\u53ef\u662f\u600e\u9ebc\u6309\u4e0b\u7b2c\u4e8c\u6b21\u5c31\u6c92\u53cd\u61c9\u4e86\uff1f\u6211\u5011\u505a\u51fa\u4e86\u4e00\u500b\u300c\u53ea\u80fd\u5920\u6210\u529f\u756b\u4e00\u6b21\u5716\u300d\u7684 Observable\u3002<\/p>\n<p>\u70ba\u4ec0\u9ebc\u5462\uff1f\u6211\u5011\u53ef\u4ee5\u5148\u4f86\u770b\u4e00\u4e0b<code>takeUntil<\/code>\u7684\u793a\u610f\u5716\uff08\u53d6\u81ea\uff1a<a href=\"http:\/\/rxmarbles.com\/#takeUntil%EF%BC%89\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/rxmarbles.com\/#takeUntil\uff09<\/a><\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/takeuntil.png\" alt=\"\" \/><\/p>\n<p>\u4ee5\u6211\u5011\u7684\u60c5\u5f62\u4f86\u8aaa\uff0c\u5c31\u662f\u53ea\u8981<code>mouseup<\/code>\u4e8b\u4ef6\u767c\u751f\uff0c\u300c\u6574\u500b Observable\u300d\u5c31\u6703\u505c\u6b62\uff0c\u6240\u4ee5\u53ea\u6709\u7b2c\u4e00\u6b21\u80fd\u5920\u756b\u5716\u6210\u529f\u3002\u4f46\u6211\u5011\u60f3\u8981\u7684\u5176\u5be6\u4e0d\u662f\u9019\u6a23\uff0c\u6211\u5011\u60f3\u8981\u7684\u662f\u53ea\u6709<code>mousemove<\/code>\u505c\u6b62\u800c\u5df2\uff0c\u800c\u4e0d\u662f\u6574\u500b\u90fd\u505c\u6b62\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u6211\u5011\u61c9\u8a72\u628a<code>takeUntil<\/code>\u653e\u5728<code>mousemove<\/code>\u7684\u5f8c\u9762\uff0c\u4e5f\u5c31\u662f\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousedown'<\/span>)\r\n  .flatMap(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousemove'<\/span>)\r\n      .takeUntil(Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mouseup'<\/span>))  \r\n  )\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> {\r\n    draw(e);\r\n  })\r\n<\/code><\/pre>\n<p>\u9019\u6a23\u5b50\u88e1\u9762\u7684\u90a3\u500b<code>mousemove<\/code>\u7684 Observable \u5c31\u6703\u5728\u6ed1\u9f20\u9b06\u958b\u6642\u505c\u6b62\u767c\u9001\u4e8b\u4ef6\uff0c\u800c\u6211\u5011\u6700\u5916\u5c64\u7684\u9019\u500b Observable \u76e3\u807d\u7684\u662f\u6ed1\u9f20\u6309\u4e0b\uff0c\u6703\u4e00\u76f4\u76e3\u807d\u4e0b\u53bb\u3002<\/p>\n<p>\u5230\u9019\u908a\u5176\u5be6\u5c31\u5dee\u4e0d\u591a\u4e86\uff0c\u4f46\u9084\u6709\u4e00\u500b\u5c0f bug \u8981\u4fee\uff0c\u5c31\u662f\u6211\u5011\u6c92\u6709\u5728<code>mousedown<\/code>\u7684\u6642\u5019\u5229\u7528<code>moveTo<\/code>\u79fb\u52d5\uff0c\u9020\u6210\u6211\u5011\u4e00\u958b\u59cb\u8aaa\u7684\u90a3\u500b\u6703\u628a\u4e0a\u6b21\u756b\u7684\u8ddf\u9019\u6b21\u756b\u7684\u9023\u5728\u4e00\u8d77\u7684\u554f\u984c\u3002<\/p>\n<p>\u90a3\u600e\u9ebc\u8fa6\u5462\uff1f\u6211\u5df2\u7d93\u628a<code>mousedown<\/code>\u4e8b\u4ef6\u8f49\u6210\u5176\u4ed6\u8cc7\u6599\u6d41\u4e86\uff0c\u6211\u8981\u600e\u9ebc\u5728<code>mousedown<\/code>\u7684\u6642\u5019\u505a\u4e8b\uff1f<\/p>\n<p>\u6709\u4e00\u500b\u65b9\u6cd5\u53eb\u505a<code>do<\/code>\uff0c\u5c31\u662f\u70ba\u4e86\u9019\u7a2e\u60c5\u5f62\u800c\u8a2d\u7acb\u7684\uff0c\u4f7f\u7528\u6642\u6a5f\u662f\uff1a\u300c\u4f60\u60f3\u505a\u4e00\u9ede\u4e8b\uff0c\u537b\u53c8\u4e0d\u60f3\u5f71\u97ff\u8cc7\u6599\u6d41\u300d\uff0c\u6709\u9ede\u50cf\u662f\u80fd\u5920\u91dd\u5c0d\u4e0d\u540c\u968e\u6bb5 subscribe \u7684\u611f\u89ba\uff0c<code>mousedown<\/code>\u7684\u6642\u5019 subscribe \u4e00\u6b21\uff0c\u6700\u5f8c\u8981\u756b\u5716\u7684\u6642\u5019\u53c8 subscribe \u4e00\u6b21\u3002<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousedown'<\/span>)\r\n  .do(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> {\r\n    ctx.moveTo(e.clientX, e.clientY)\r\n  })\r\n  .flatMap(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mousemove'<\/span>)\r\n      .takeUntil(Rx.Observable.fromEvent(canvas, <span class=\"hljs-string\">'mouseup'<\/span>))  \r\n  )\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> {\r\n    draw(e);\r\n  })\r\n<\/code><\/pre>\n<p>\u5230\u9019\u908a\uff0c\u6211\u5011\u5c31\u9806\u5229\u5b8c\u6210\u4e86\u756b\u5716\u7684\u529f\u80fd\u3002<\/p>\n<p>\u5982\u679c\u4f60\u60f3\u8a66\u8a66\u770b\u4f60\u6709\u6c92\u6709\u641e\u61c2\uff0c\u53ef\u4ee5\u5be6\u4f5c\u770b\u770b\u62d6\u62c9\u79fb\u52d5\u7269\u9ad4\u7684\u529f\u80fd\uff0c\u539f\u7406\u8ddf\u9019\u500b\u5f88\u985e\u4f3c\uff0c\u90fd\u662f\u5075\u6e2c\u6ed1\u9f20\u7684\u4e8b\u4ef6\u4e26\u4e14\u505a\u51fa\u53cd\u61c9\u3002<\/p>\n<h1>\u559d\u53e3\u6c34\u4f11\u606f\u4e00\u4e0b\uff0c\u4e0b\u534a\u5834\u8981\u958b\u59cb\u4e86<\/h1>\n<p>\u4e0a\u534a\u5834\u7684\u76ee\u6a19\u5728\u65bc\u8b93\u4f60\u7406\u89e3\u4ec0\u9ebc\u662f Rx\uff0c\u4e26\u4e14\u638c\u63e1\u5e7e\u500b\u57fa\u672c\u6982\u5ff5\uff1a<\/p>\n<ol>\n<li>\u4e00\u500b\u8cc7\u6599\u6d41\u53ef\u4ee5\u7d93\u904e\u4e00\u7cfb\u5217\u8f49\u63db\uff0c\u8b8a\u6210\u53e6\u4e00\u500b\u8cc7\u6599\u6d41<\/li>\n<li>\u9019\u4e9b\u8f49\u63db\u57fa\u672c\u4e0a\u90fd\u8ddf\u9663\u5217\u6709\u7684\u5dee\u4e0d\u591a\uff0c\u50cf\u662f<code>map<\/code>\u3001<code>filter<\/code>\u3001<code>flatten<\/code>\u7b49\u7b49<\/li>\n<li>\u4f60\u53ef\u4ee5\u5408\u4f75\u591a\u500b Observable\uff0c\u4e5f\u53ef\u4ee5\u628a\u4e8c\u7dad\u7684 Observable \u58d3\u5e73<\/li>\n<\/ol>\n<p>\u4e0b\u534a\u5834\u5c08\u6ce8\u7684\u9ede\u5247\u662f\u5728\u65bc\u5be6\u6230\u61c9\u7528\uff0c\u4e26\u4e14\u570d\u7e5e\u8457 RxJS \u6700\u9069\u5408\u7684\u5834\u666f\u4e4b\u4e00\uff1aAPI\u3002<\/p>\n<p>\u524d\u9762\u6211\u5011\u6709\u63d0\u5230\u8aaa\u53ef\u4ee5\u628a DOM \u7269\u4ef6\u7684 event \u8b8a\u6210\u8cc7\u6599\u6d41\uff0c\u4f46\u9664\u4e86\u9019\u500b\u4ee5\u5916\uff0cPromise \u5176\u5be6\u4e5f\u53ef\u4ee5\u8b8a\u6210\u8cc7\u6599\u6d41\u3002\u6982\u5ff5\u5176\u5be6\u4e5f\u5f88\u7c21\u55ae\u5566\uff0c\u5c31\u662f Promise \u88ab resovle \u7684\u6642\u5019\u5c31\u767c\u9001\u4e00\u500b\u8cc7\u6599\uff0c\u88ab reject \u7684\u6642\u5019\u5c31\u7d42\u6b62\u3002<\/p>\n<p>\u8b93\u6211\u5011\u4f86\u770b\u4e00\u500b\u7c21\u55ae\u7684\u5c0f\u7bc4\u4f8b\uff0c\u6bcf\u6309\u4e00\u6b21\u6309\u9215\u5c31\u6703\u767c\u9001\u4e00\u500b request<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">sendRequest<\/span> () <\/span>{\r\n  <span class=\"hljs-keyword\">return<\/span> fetch(<span class=\"hljs-string\">'<a class=\"vglnk\" href=\"https:\/\/jsonplaceholder.typicode.com\/posts\/1\" rel=\"nofollow\">https:\/\/jsonplaceholder.typicode.com\/posts\/1<\/a>'<\/span>).then(<span class=\"hljs-function\"><span class=\"hljs-params\">res<\/span> =&gt;<\/span> res.json())\r\n}\r\n\r\nRx.Observable.fromEvent(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'input[name=send]'<\/span>), <span class=\"hljs-string\">'click'<\/span>)\r\n  .flatMap(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> Rx.Observable.fromPromise(sendRequest()))\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(value)\r\n  })\r\n<\/code><\/pre>\n<p>\u9019\u908a\u7528<code>flatMap<\/code>\u7684\u539f\u56e0\u8ddf\u525b\u624d\u7684\u756b\u5716\u7bc4\u4f8b\u4e00\u6a23\uff0c\u6211\u5011\u8981\u5728\u6309\u4e0b\u6309\u9215\u6642\uff0c\u628a\u539f\u672c\u7684\u8cc7\u6599\u6d41\u8f49\u63db\u6210\u65b0\u7684\u8cc7\u6599\u6d41\uff0c\u5982\u679c\u53ea\u7528<code>map<\/code>\u7684\u8a71\uff0c\u6703\u8b8a\u6210\u4e00\u500b\u4e8c\u7dad\u7684 Observable\uff0c\u6240\u4ee5\u5fc5\u9808\u8981\u7528<code>flatten<\/code>\u628a\u5b83\u58d3\u5e73\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u8a66\u8a66\u770b\u628a<code>flatMap<\/code>\u6539\u6210<code>map<\/code>\uff0c\u4f60\u6700\u5f8c subscribe \u5f97\u5230\u7684\u503c\u5c31\u6703\u662f\u4e00\u5806 Observable \u800c\u4e0d\u662f\u4f60\u60f3\u8981\u7684\u8cc7\u6599\u3002<\/p>\n<p>\u77e5\u9053\u600e\u9ebc\u7528 Rx \u4f86\u8655\u7406 API \u4e4b\u5f8c\uff0c\u5c31\u53ef\u4ee5\u4f86\u505a\u4e00\u500b\u7d93\u5178\u7bc4\u4f8b\u4e86\uff1aAutoComplete\u3002<\/p>\n<p>\u6211\u5728\u505a\u9019\u500b\u7bc4\u4f8b\u7684\u6642\u5019\u6709\u6975\u5927\u90e8\u5206\u53c3\u8003<a href=\"https:\/\/ithelp.ithome.com.tw\/articles\/10188457\" target=\"_blank\" rel=\"noopener noreferrer\">30 \u5929\u7cbe\u901a RxJS(19): \u5be6\u52d9\u7bc4\u4f8b &#8211; \u7c21\u6613 Auto Complete \u5be6\u4f5c<\/a>\u3001<a href=\"http:\/\/blog.techbridge.cc\/2016\/05\/28\/reactive-programming-intro-by-rxjs\/\">Reactive Programming \u7c21\u4ecb\u8207\u6559\u5b78(\u4ee5 RxJS \u70ba\u4f8b)<\/a>\u4ee5\u53ca<a href=\"http:\/\/www.alloyteam.com\/2016\/12\/learn-rxjs\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u6784\u5efa\u6d41\u5f0f\u5e94\u7528\u2014RxJS\u8be6\u89e3<\/a>\uff0c\u518d\u6b21\u611f\u8b1d\u9019\u4e09\u7bc7\u6587\u7ae0\u3002<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/auto.gif\" alt=\"\" \/><\/p>\n<p>\u70ba\u4e86\u8981\u8b93\u5927\u5bb6\u80fd\u5920\u9ad4\u6703 Reactive Programming \u8ddf\u4e00\u822c\u7684\u6709\u4ec0\u9ebc\u4e0d\u4e00\u6a23\uff0c\u6211\u5011\u5148\u7528\u8001\u65b9\u6cd5\u505a\u51fa\u9019\u500b Auto Complete \u7684\u529f\u80fd\u5427\uff01<\/p>\n<p>\u5148\u4f86\u5beb\u4e00\u4e0b\u6700\u5e95\u5c64\u7684\u5169\u500b\u51fd\u5f0f\uff0c\u8ca0\u8cac\u6293\u8cc7\u6599\u7684\u4ee5\u53ca render \u5efa\u8b70\u6e05\u55ae\u7684\uff0c\u6211\u5011\u4f7f\u7528\u7dad\u57fa\u767e\u79d1\u7684 API \u4f86\u7576\u4f5c\u7bc4\u4f8b\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">searchWikipedia<\/span> (<span class=\"hljs-params\">term<\/span>) <\/span>{\r\n    <span class=\"hljs-keyword\">return<\/span> $.ajax({\r\n        <span class=\"hljs-attr\">url<\/span>: <span class=\"hljs-string\">'<a class=\"vglnk\" href=\"http:\/\/en.wikipedia.org\/w\/api.php\" rel=\"nofollow\">http:\/\/en.wikipedia.org\/w\/api.php<\/a>'<\/span>,\r\n        <span class=\"hljs-attr\">dataType<\/span>: <span class=\"hljs-string\">'jsonp'<\/span>,\r\n        <span class=\"hljs-attr\">data<\/span>: {\r\n            <span class=\"hljs-attr\">action<\/span>: <span class=\"hljs-string\">'opensearch'<\/span>,\r\n            <span class=\"hljs-attr\">format<\/span>: <span class=\"hljs-string\">'json'<\/span>,\r\n            <span class=\"hljs-attr\">search<\/span>: term\r\n        }\r\n    }).promise();\r\n}\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">renderList<\/span> (<span class=\"hljs-params\">list<\/span>) <\/span>{\r\n  $(<span class=\"hljs-string\">'.auto-complete__list'<\/span>).empty();\r\n  $(<span class=\"hljs-string\">'.auto-complete__list'<\/span>).append(list.map(<span class=\"hljs-function\"><span class=\"hljs-params\">item<\/span> =&gt;<\/span> <span class=\"hljs-string\">'&lt;li&gt;'<\/span> + item + <span class=\"hljs-string\">'&lt;\/li&gt;'<\/span>))\r\n}\r\n<\/code><\/pre>\n<p>\u9019\u908a\u8981\u6ce8\u610f\u7684\u4e00\u500b\u9ede\u662f\u7dad\u57fa\u767e\u79d1\u56de\u50b3\u7684\u8cc7\u6599\u6703\u662f\u4e00\u500b\u9663\u5217\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"hljs cs\">[<span class=\"hljs-meta\">\u4f60\u8f38\u5165\u7684\u95dc\u9375\u5b57, \u95dc\u9375\u5b57\u6e05\u55ae, \u6bcf\u500b\u95dc\u9375\u5b57\u7684\u4ecb\u7d39, \u6bcf\u500b\u95dc\u9375\u5b57\u7684\u9023\u7d50<\/span>]\r\n\r\n<span class=\"hljs-comment\">\/\/ \u7bc4\u4f8b\uff1a<\/span>\r\n[<span class=\"hljs-meta\">\r\n  <span class=\"hljs-meta-string\">\"dd\"<\/span>,\r\n  [<span class=\"hljs-meta-string\">\"Dd\"<\/span>, <span class=\"hljs-meta-string\">\"DDR3 SDRAM\"<\/span>, <span class=\"hljs-meta-string\">\"DD tank\"<\/span><\/span>],\r\n  [<span class=\"hljs-meta\"><span class=\"hljs-meta-string\">\"\"<\/span>, <span class=\"hljs-meta-string\">\"Double data rate type three SDRAM (DDR3 SDRAM)\"<\/span>, <span class=\"hljs-meta-string\">\"DD or Duplex Drive tanks\"<\/span><\/span>],\r\n  [<span class=\"hljs-meta\"><a class=\"vglnk\" href=\"https:\/\/en.wikipedia.org\/wiki\/Dd\" rel=\"nofollow\">https:\/\/en.wikipedia.org\/wiki\/Dd<\/a><span class=\"hljs-meta-string\">\", \"<\/span><a class=\"vglnk\" href=\"https:\/\/en.wikipedia.org\/wiki\/DDR3_SDRAM\" rel=\"nofollow\">https:\/\/en.wikipedia.org\/wiki\/DDR3_SDRAM<\/a><span class=\"hljs-meta-string\">\", \"<\/span>...\u7565<span class=\"hljs-meta-string\">\"]\r\n]\r\n<\/span><\/span><\/code><\/pre>\n<p>\u5728\u6211\u5011\u7684\u7c21\u55ae\u793a\u7bc4\u4e2d\uff0c\u53ea\u9700\u8981\u53d6 index \u70ba 1 \u7684\u90a3\u500b\u95dc\u9375\u5b57\u6e05\u55ae\u5c31\u597d\u4e86\u3002\u800c<code>renderList<\/code>\u9019\u500b function \u5247\u662f\u50b3\u9032\u4e00\u500b\u9663\u5217\uff0c\u5c31\u6703\u628a\u9663\u5217\u5167\u5bb9\u8f49\u6210<code>li<\/code>\u986f\u793a\u51fa\u4f86\u3002<\/p>\n<p>\u6709\u4e86\u9019\u5169\u500b\u6700\u57fa\u790e\u7684 function \u4e4b\u5f8c\uff0c\u5c31\u53ef\u4ee5\u5f88\u8f15\u6613\u5730\u5b8c\u6210 Auto Complete \u7684\u529f\u80fd\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>).addEventListener(<span class=\"hljs-string\">'input'<\/span>, (e) =&gt; {\r\n  searchWikipedia(e.target.value).then(<span class=\"hljs-function\">(<span class=\"hljs-params\">data<\/span>) =&gt;<\/span> {\r\n    renderList(data[<span class=\"hljs-number\">1<\/span>])\r\n  })\r\n})\r\n<\/code><\/pre>\n<p>\u7a0b\u5f0f\u78bc\u61c9\u8a72\u5f88\u597d\u61c2\uff0c\u5c31\u662f\u6bcf\u6b21\u6309\u4e0b\u8f38\u5165\u6771\u897f\u7684\u6642\u5019\u53bb call api\uff0c\u628a\u56de\u50b3\u7684\u8cc7\u6599\u9935\u7d66<code>renderList<\/code>\u53bb\u6e32\u67d3\u3002<\/p>\n<p>\u6700\u57fa\u672c\u7684\u529f\u80fd\u5b8c\u6210\u4e86\uff0c\u6211\u5011\u8981\u4f86\u505a\u4e00\u9ede\u512a\u5316\uff0c\u56e0\u70ba\u9019\u6a23\u5b50\u7684\u5be6\u4f5c\u5176\u5be6\u662f\u6709\u4e00\u4e9b\u554f\u984c\u7684\u3002<\/p>\n<p>\u7b2c\u4e00\u500b\u554f\u984c\uff0c\u73fe\u5728\u53ea\u8981\u6bcf\u6253\u4e00\u500b\u5b57\u5c31\u6703\u9001\u51fa\u4e00\u500b request\uff0c\u53ef\u662f\u9019\u6a23\u505a\u5176\u5be6\u6709\u9ede\u6d6a\u8cbb\uff0c\u56e0\u70ba\u4f7f\u7528\u8005\u53ef\u80fd\u5feb\u901f\u7684\u8f38\u5165\u4e86\uff1a<code>java<\/code>\u60f3\u8981\u627e\u76f8\u95dc\u7684\u8cc7\u6599\uff0c\u4ed6\u6839\u672c\u4e0d\u5728\u4e4e<code>j<\/code>\u3001<code>ja<\/code>\u3001<code>jav<\/code>\u9019\u4e09\u500b request\u3002<\/p>\n<p>\u8981\u600e\u9ebc\u505a\u5462\uff1f\u6211\u5011\u5c31\u6539\u5beb\u6210\u5982\u679c 250ms \u88e1\u9762\u6c92\u6709\u518d\u8f38\u5165\u65b0\u7684\u6771\u897f\u624d\u767c\u9001 request \u5c31\u597d\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u9019\u7a2e\u591a\u9918\u7684\u6d6a\u8cbb\u3002<\/p>\n<p>\u9019\u7a2e\u6280\u5de7\u7a31\u4f5c<code>debounce<\/code>\uff0c\u5be6\u4f5c\u4e0a\u4e5f\u5f88\u7c21\u55ae\uff0c\u5c31\u662f\u5229\u7528<code>setTimeout<\/code>\u8ddf<code>clearTimeout<\/code>\u3002<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-keyword\">var<\/span> timer = <span class=\"hljs-literal\">null<\/span>;\r\n<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>).addEventListener(<span class=\"hljs-string\">'input'<\/span>, (e) =&gt; {\r\n  <span class=\"hljs-keyword\">if<\/span> (timer) {\r\n    clearTimeout(timer);\r\n  }\r\n  timer = setTimeout(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n    searchWikipedia(e.target.value).then(<span class=\"hljs-function\">(<span class=\"hljs-params\">data<\/span>) =&gt;<\/span> {\r\n      renderList(data[<span class=\"hljs-number\">1<\/span>])\r\n    })\r\n  }, <span class=\"hljs-number\">250<\/span>)\r\n})\r\n<\/code><\/pre>\n<p>\u5728 input \u4e8b\u4ef6\u88ab\u89f8\u767c\u4e4b\u5f8c\uff0c\u6211\u5011\u4e0d\u76f4\u63a5\u505a\u4e8b\u60c5\uff0c\u800c\u662f\u8a2d\u7f6e\u4e86\u4e00\u500b 250ms \u904e\u5f8c\u6703\u89f8\u767c\u7684 timer\uff0c\u5982\u679c 250ms \u5167 input \u518d\u6b21\u88ab\u89f8\u767c\u7684\u8a71\uff0c\u6211\u5011\u5c31\u628a\u4e0a\u6b21\u7684 timer \u6e05\u6389\uff0c\u518d\u91cd\u65b0\u8a2d\u7f6e\u4e00\u500b\u3002<\/p>\n<p>\u5982\u6b64\u4e00\u4f86\uff0c\u5c31\u53ef\u4ee5\u4fdd\u8b49\u4f7f\u7528\u8005\u5982\u679c\u5728\u77ed\u6642\u9593\u5167\u4e0d\u65b7\u8f38\u5165\u6587\u5b57\u7684\u8a71\uff0c\u4e0d\u6703\u9001\u51fa\u76f8\u5c0d\u61c9\u7684 request\uff0c\u800c\u662f\u6703\u7b49\u5230\u6700\u5f8c\u4e00\u500b\u5b57\u6253\u5b8c\u4e4b\u5f8c\u7684 250 ms \u624d\u767c\u51fa request\u3002<\/p>\n<p>\u89e3\u6c7a\u4e86\u7b2c\u4e00\u500b\u554f\u984c\u4e4b\u5f8c\uff0c\u9084\u6709\u4e00\u500b\u6f5b\u5728\u7684\u554f\u984c\u9700\u8981\u89e3\u6c7a\u3002<\/p>\n<p>\u5047\u8a2d\u6211\u73fe\u5728\u8f38\u5165<code>a<\/code>\uff0c\u63a5\u8457\u522a\u9664\u7136\u5f8c\u518d\u8f38\u5165<code>b<\/code>\uff0c\u6240\u4ee5\u7b2c\u4e00\u500b request \u6703\u662f<code>a<\/code>\u7684\u7d50\u679c\uff0c\u7b2c\u4e8c\u500b request \u6703\u662f<code>b<\/code>\u7684\u7d50\u679c\u3002\u6211\u5011\u5047\u8a2d server \u51fa\u4e86\u4e00\u9ede\u554f\u984c\uff0c\u6240\u4ee5\u7b2c\u4e8c\u500b\u7684 response \u53cd\u800c\u6bd4\u7b2c\u4e00\u500b\u9084\u5148\u5230\u9054\uff08\u53ef\u80fd<code>b<\/code>\u7684\u641c\u5c0b\u7d50\u679c\u6709 cache \u4f46\u662f<code>a<\/code>\u6c92\u6709\uff09\uff0c\u9019\u6642\u5019\u5c31\u6703\u5148\u986f\u793a<code>b<\/code>\u7684\u5167\u5bb9\uff0c\u7b49\u5230\u7b2c\u4e00\u500b response \u56de\u4f86\u6642\uff0c\u518d\u986f\u793a<code>a<\/code>\u7684\u5167\u5bb9\u3002<\/p>\n<p>\u53ef\u662f\u9019\u6a23 UI \u5c31\u6709\u554f\u984c\u4e86\uff0c\u6211\u660e\u660e\u8f38\u5165\u7684\u662f<code>b<\/code>\uff0c\u600e\u9ebc auto complete \u7684\u63a8\u85a6\u95dc\u9375\u5b57\u662f<code>a<\/code>\u958b\u982d\uff1f<\/p>\n<p>\u6240\u4ee5\u6211\u5011\u5fc5\u9808\u8981\u505a\u500b\u6aa2\u67e5\uff0c\u6aa2\u67e5\u8fd4\u56de\u7684\u8cc7\u6599\u8ddf\u6211\u73fe\u5728\u8f38\u5165\u7684\u8cc7\u6599\u662f\u4e0d\u662f\u4e00\u81f4\uff0c\u5982\u679c\u4e00\u81f4\u7684\u8a71\u624d render\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-keyword\">var<\/span> timer = <span class=\"hljs-literal\">null<\/span>;\r\n<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>).addEventListener(<span class=\"hljs-string\">'input'<\/span>, (e) =&gt; {\r\n  <span class=\"hljs-keyword\">if<\/span> (timer) {\r\n    clearTimeout(timer);\r\n  }\r\n  timer = setTimeout(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n    searchWikipedia(e.target.value).then(<span class=\"hljs-function\">(<span class=\"hljs-params\">data<\/span>) =&gt;<\/span> {\r\n      <span class=\"hljs-keyword\">if<\/span> (data[<span class=\"hljs-number\">0<\/span>] === <span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>).value) {\r\n        renderList(data[<span class=\"hljs-number\">1<\/span>])\r\n      }\r\n    })\r\n  }, <span class=\"hljs-number\">250<\/span>)\r\n})\r\n<\/code><\/pre>\n<p>\u5230\u9019\u88e1\u61c9\u8a72\u5c31\u5dee\u4e0d\u591a\u4e86\uff0c\u8a72\u6709\u7684\u529f\u80fd\u90fd\u6709\u4e86\u3002<\/p>\n<p>\u63a5\u8457\uff0c\u8b93\u6211\u5011\u4f86\u6311\u6230\u7528 RxJS \u5be6\u4f5c\u5427\uff01<\/p>\n<p>\u9996\u5148\uff0c\u5148\u5f9e\u7c21\u55ae\u7248\u7684\u958b\u59cb\u505a\uff0c\u5c31\u662f\u4e0d\u5305\u542b debounce \u8ddf\u4e0a\u9762 API \u9806\u5e8f\u554f\u984c\u7684\u5be6\u4f5c\uff0c\u76e3\u807d input \u4e8b\u4ef6\u8f49\u63db\u6210 request\uff0c\u7136\u5f8c\u7528<code>flatMap<\/code>\u58d3\u5e73\uff0c\u5176\u5be6\u5c31\u8ddf\u4e0a\u9762\u7684\u6d41\u7a0b\u5dee\u4e0d\u591a\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable\r\n  .fromEvent(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>), <span class=\"hljs-string\">'input'<\/span>)\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> e.target.value)\r\n  .flatMap(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-keyword\">return<\/span> Rx.Observable.from(searchWikipedia(value)).map(<span class=\"hljs-function\"><span class=\"hljs-params\">res<\/span> =&gt;<\/span> res[<span class=\"hljs-number\">1<\/span>])\r\n  })\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    renderList(value);\r\n  })\r\n<\/code><\/pre>\n<p>\u9019\u908a\u7528\u4e86\u5169\u500b<code>map<\/code>\uff0c\u4e00\u500b\u662f\u628a<code>e<\/code>\u8f49\u6210<code>e.target.value<\/code>\uff0c\u4e00\u500b\u662f\u628a\u50b3\u56de\u4f86\u7684\u7d50\u679c\u8f49\u6210<code>res[1]<\/code>\uff0c\u56e0\u70ba\u6211\u5011\u53ea\u9700\u8981\u95dc\u9375\u5b57\u5217\u8868\uff0c\u5176\u4ed6\u7684\u6771\u897f\u5176\u5be6\u90fd\u4e0d\u7528\u3002<\/p>\n<p>\u90a3\u8981\u5982\u4f55\u5be6\u4f5c<code>debounce<\/code>\u7684\u529f\u80fd\u5462\uff1f<\/p>\n<p>RxJS \u5df2\u7d93\u5e6b\u4f60\u5be6\u4f5c\u597d\u4e86\uff0c\u6240\u4ee5\u4f60\u53ea\u8981\u52a0\u4e0a<code>.debounceTime(250)<\/code>\u5c31\u597d\u4e86\uff0c\u5c31\u662f\u9019\u9ebc\u7c21\u55ae\u3002<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable\r\n  .fromEvent(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>), <span class=\"hljs-string\">'input'<\/span>)\r\n  .debounceTime(<span class=\"hljs-number\">250<\/span>)\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> e.target.value)\r\n  .flatMap(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-keyword\">return<\/span> Rx.Observable.from(searchWikipedia(value)).map(<span class=\"hljs-function\"><span class=\"hljs-params\">res<\/span> =&gt;<\/span> res[<span class=\"hljs-number\">1<\/span>])\r\n  })\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    renderList(value);\r\n  })\r\n<\/code><\/pre>\n<p>\u9084\u6709\u6700\u5f8c\u4e00\u500b\u554f\u984c\u8981\u89e3\u6c7a\uff0c\u90a3\u5c31\u662f\u525b\u624d\u63d0\u5230\u7684 request \u7684\u9806\u5e8f\u554f\u984c\u3002<\/p>\n<p>Observable \u6709\u4e00\u500b\u4e0d\u540c\u7684\u89e3\u6cd5\uff0c\u6211\u4f86\u89e3\u91cb\u7d66\u5927\u5bb6\u807d\u807d\u3002<\/p>\n<p>\u5176\u5be6\u9664\u4e86<code>flatMap<\/code>\u4ee5\u5916\uff0c\u9084\u6709\u53e6\u5916\u4e00\u7a2e\u65b9\u5f0f\u53eb\u505a<code>switchMap<\/code>\uff0c\u4ed6\u5011\u7684\u5dee\u5225\u5728\u65bc\u8981\u600e\u9ebc\u628a Observable \u7d66\u58d3\u5e73\u3002\u524d\u8005\u6211\u5011\u4e4b\u524d\u4ecb\u7d39\u904e\u4e86\uff0c\u5c31\u662f\u6703\u628a\u6bcf\u4e00\u500b\u4e8c\u7dad\u7684 Observable \u90fd\u58d3\u5e73\uff0c\u4e26\u4e14\u300c\u6bcf\u4e00\u500b\u90fd\u57f7\u884c\u300d\u3002<\/p>\n<p>\u800c<code>switchMap<\/code>\u7684\u5dee\u5225\u5728\u65bc\uff0c\u4ed6\u6c38\u9060\u53ea\u6703\u8655\u7406\u6700\u5f8c\u4e00\u500b Observable\u3002\u62ff\u6211\u5011\u7684\u4f8b\u5b50\u4f86\u8aaa\uff0c\u5047\u8a2d\u7b2c\u4e00\u500b request \u9084\u6c92\u56de\u4f86\u7684\u6642\u5019\uff0c\u7b2c\u4e8c\u500b request \u5c31\u767c\u51fa\u53bb\u4e86\uff0c\u90a3\u6211\u5011\u7684 Observable \u5c31\u53ea\u6703\u8655\u7406\u7b2c\u4e8c\u500b request\uff0c\u800c\u4e0d\u7ba1\u7b2c\u4e00\u500b\u3002<\/p>\n<p>\u7b2c\u4e00\u500b\u9084\u662f\u6703\u767c\u9001\uff0c\u9084\u662f\u6703\u63a5\u6536\u5230\u8cc7\u6599\uff0c\u53ea\u662f\u63a5\u6536\u5230\u8cc7\u6599\u4ee5\u5f8c\u4e0d\u6703\u518d\u628a\u9019\u500b\u8cc7\u6599 emit \u5230 Observable \u4e0a\u9762\uff0c\u610f\u601d\u5c31\u662f\u6839\u672c\u6c92\u4eba\u7406\u9019\u500b\u8cc7\u6599\u4e86\u3002<\/p>\n<p>\u53ef\u4ee5\u770b\u4e00\u4e0b\u7c21\u964b\u7684\u5716\u89e3\uff0c<code>flatMap<\/code>\u6bcf\u4e00\u500b promise resolve \u4e4b\u5f8c\u7684\u8cc7\u6599\u90fd\u6703\u88ab\u767c\u9001\u5230\u6211\u5011\u7684 Observable \u4e0a\u9762\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/flatmap.png\" alt=\"\" \/><\/p>\n<p>\u800c<code>switchMap<\/code>\u53ea\u6703\u8655\u7406\u6700\u5f8c\u4e00\u500b\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/switchmap.png\" alt=\"\" \/><\/p>\n<p>\u6240\u4ee5\u6211\u5011\u53ea\u8981\u628a<code>flatMap<\/code>\u6539\u6210<code>switchMap<\/code>\uff0c\u5c31\u53ef\u4ee5\u6c38\u9060\u53ea\u95dc\u6ce8\u6700\u5f8c\u4e00\u500b\u767c\u9001\u7684 request\uff0c\u4e0d\u7528\u53bb\u7ba1 request \u50b3\u56de\u4f86\u7684\u9806\u5e8f\uff0c\u56e0\u70ba\u524d\u9762\u7684 request \u90fd\u8ddf\u9019\u500b Observable \u7121\u95dc\u4e86\u3002<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable\r\n  .fromEvent(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>), <span class=\"hljs-string\">'input'<\/span>)\r\n  .debounceTime(<span class=\"hljs-number\">250<\/span>)\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> e.target.value)\r\n  .switchMap(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-keyword\">return<\/span> Rx.Observable.from(searchWikipedia(value)).map(<span class=\"hljs-function\"><span class=\"hljs-params\">res<\/span> =&gt;<\/span> res[<span class=\"hljs-number\">1<\/span>])\r\n  })\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    renderList(value);\r\n  })\r\n<\/code><\/pre>\n<p>\u505a\u5230\u9019\u908a\uff0c\u5c31\u8ddf\u525b\u525b\u5be6\u4f5c\u7684\u529f\u80fd\u4e00\u6a21\u4e00\u6a23\u4e86\u3002<\/p>\n<p>\u4f46\u5176\u5be6\u9084\u6709\u5730\u65b9\u53ef\u4ee5\u6539\u9032\uff0c\u6211\u5011\u4f86\u505a\u500b\u5c0f\u5c0f\u7684\u52a0\u5f37\u597d\u4e86\u3002\u73fe\u5728\u7684\u8a71\u7576\u6211\u8f38\u5165<code>abc<\/code>\uff0c\u6703\u51fa\u73fe<code>abc<\/code>\u7684\u76f8\u95dc\u95dc\u9375\u5b57\uff0c\u63a5\u8457\u6211\u628a<code>abc<\/code>\u5168\u90e8\u522a\u6389\uff0c\u8b93 input \u8b8a\u6210\u7a7a\u767d\uff0c\u6703\u767c\u73fe API \u9019\u6642\u5019\u56de\u50b3\u4e00\u500b\u932f\u8aa4\uff1a<code>The \"search\" parameter must be set.<\/code>\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u5011\u53ef\u4ee5\u5728 input \u662f\u7a7a\u7684\u6642\u5019\uff0c\u4e0d\u767c\u9001 request\uff0c\u53ea\u56de\u50b3\u4e00\u500b\u7a7a\u9663\u5217\uff0c\u800c\u56de\u50b3\u7a7a\u9663\u5217\u9019\u4ef6\u4e8b\u60c5\u53ef\u4ee5\u7528<code>Rx.Observable.of([])<\/code>\u4f86\u5b8c\u6210\uff0c\u9019\u6a23\u6703\u5275\u9020\u4e00\u500b\u6703\u767c\u9001\u7a7a\u9663\u5217\u7684 Observable\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable\r\n  .fromEvent(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>), <span class=\"hljs-string\">'input'<\/span>)\r\n  .debounceTime(<span class=\"hljs-number\">250<\/span>)\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> e.target.value)\r\n  .switchMap(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-keyword\">return<\/span> value.length &lt; <span class=\"hljs-number\">1<\/span> ? Rx.Observable.of([]) : Rx.Observable.from(searchWikipedia(value)).map(<span class=\"hljs-function\"><span class=\"hljs-params\">res<\/span> =&gt;<\/span> res[<span class=\"hljs-number\">1<\/span>])\r\n  })\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    renderList(value);\r\n  })\r\n<\/code><\/pre>\n<p>\u9084\u6709\u4e00\u500b\u9ede\u64ca\u95dc\u9375\u5b57\u6e05\u55ae\u4e4b\u5f8c\u628a\u6587\u5b57\u8a2d\u5b9a\u6210\u95dc\u9375\u5b57\u7684\u529f\u80fd\uff0c\u5728\u9019\u908a\u5c31\u4e0d\u793a\u7bc4\u7d66\u5927\u5bb6\u770b\u4e86\uff0c\u4f46\u5176\u5be6\u5c31\u662f\u518d\u5275\u9020\u4e00\u500b Observable \u53bb\u76e3\u807d\u9ede\u64ca\u4e8b\u4ef6\uff0c\u9ede\u5230\u7684\u6642\u5019\u5c31\u8a2d\u5b9a\u6587\u5b57\u4e26\u4e14\u628a\u95dc\u9375\u5b57\u6e05\u55ae\u7d66\u6e05\u6389\u3002<\/p>\n<p>\u6211\u76f4\u63a5\u9644\u4e0a\u53c3\u8003\u7a0b\u5f0f\u78bc\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable\r\n  .fromEvent(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete__list'<\/span>), <span class=\"hljs-string\">'click'<\/span>)\r\n  .filter(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> e.target.matches(<span class=\"hljs-string\">'li'<\/span>))\r\n  .map(<span class=\"hljs-function\"><span class=\"hljs-params\">e<\/span> =&gt;<\/span> e.target.innerHTML)\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">value<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.auto-complete input'<\/span>).value = value;\r\n    renderList([])\r\n  })\r\n<\/code><\/pre>\n<p>\u96d6\u7136\u6211\u53ea\u4ecb\u7d39\u4e86\u6700\u57fa\u672c\u7684\u64cd\u4f5c\uff0c\u4f46 RxJS \u7684\u5f37\u5927\u4e4b\u8655\u5c31\u5728\u65bc\u9664\u4e86\u9019\u4e9b\uff0c\u4f60\u751a\u81f3\u9084\u6709<code>retry<\/code>\u53ef\u4ee5\u7528\uff0c\u53ea\u8981\u8f15\u9b06\u52a0\u4e0a\u9019\u500b\uff0c\u5c31\u80fd\u5920\u6709\u81ea\u52d5\u91cd\u8a66\u7684\u529f\u80fd\u3002<\/p>\n<p>\u76f8\u95dc\u7684\u61c9\u7528\u5834\u666f\u9084\u6709\u5f88\u591a\uff0c\u53ea\u8981\u662f\u8ddf API \u6709\u95dc\u9023\u7684\u5e7e\u4e4e\u90fd\u53ef\u4ee5\u7528 RxJS \u5f88\u512a\u96c5\u7684\u89e3\u6c7a\u3002<\/p>\n<h1>React + Redux \u7684\u975e\u540c\u6b65\u89e3\u6c7a\u65b9\u6848\uff1aredux-observable<\/h1>\n<p>\u9019\u662f\u6211\u5011\u4eca\u5929\u7684\u6700\u5f8c\u4e00\u500b\u4e3b\u984c\u4e86\uff0c\u4e5f\u662f\u6211\u958b\u5834\u6240\u63d0\u5230\u7684\u3002<\/p>\n<p>React + Redux \u9019\u4e00\u5957\u975e\u5e38\u5e38\u898b\u7684\u7d44\u5408\uff0c\u4e00\u76f4\u90fd\u6709\u4e00\u500b\u554f\u984c\u5b58\u5728\uff0c\u90a3\u5c31\u662f\u6c92\u6709\u898f\u7bc4\u975e\u540c\u6b65\u884c\u70ba\uff08\u4f8b\u5982\u8aaa API\uff09\u5230\u5e95\u61c9\u8a72\u600e\u9ebc\u8655\u7406\u3002\u800c\u958b\u6e90\u793e\u7fa4\u4e5f\u6709\u8a31\u591a\u4e0d\u540c\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u4f8b\u5982\u8aaa redux-thunk\u3001redux-promise\u3001redux-saga \u7b49\u7b49\u3002<\/p>\n<p>\u6211\u5011\u524d\u9762\u8b1b\u4e86\u9019\u9ebc\u591a\u6771\u897f\uff0c\u8209\u4e86\u9019\u9ebc\u591a\u7bc4\u4f8b\uff0c\u5c31\u662f\u8981\u8b49\u660e\u7d66\u5927\u5bb6\u770b Reactive programming \u5f88\u9069\u5408\u62ff\u4f86\u89e3\u6c7a\u8907\u96dc\u7684\u975e\u540c\u6b65\u554f\u984c\u3002\u56e0\u6b64\uff0cNetflix \u5c31\u958b\u6e90\u4e86\u9019\u5957<a href=\"https:\/\/redux-observable.js.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">redux-observable<\/a>\uff0c\u7528 RxJS \u4f86\u8655\u7406\u975e\u540c\u6b65\u884c\u70ba\u3002<\/p>\n<p>\u5728\u77ad\u89e3 RxJS \u4e4b\u5f8c\uff0c\u53ef\u4ee5\u5f88\u8f15\u9b06\u7684\u7406\u89e3<code>redux-observable<\/code>\u7684\u539f\u7406\u3002<\/p>\n<p>\u5728 redux \u7684\u61c9\u7528\u88e1\u9762\uff0c\u6240\u6709\u7684 action \u90fd\u6703\u901a\u904e middleware\uff0c\u4f60\u53ef\u4ee5\u5728\u9019\u908a\u5c0d action \u505a\u4efb\u4f55\u8655\u7406\u3002\u6216\u8005\u6211\u5011\u4e5f\u53ef\u4ee5\u628a action \u770b\u505a\u662f\u4e00\u500b Observable\uff0c\u4f8b\u5982\u8aaa\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-comment\">\/\/ \u7bc4\u4f8b\u800c\u5df2<\/span>\r\nRx.Observable.from(actionStreams)\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">action<\/span> =&gt;<\/span> {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(action.type, action.payload)\r\n  })\r\n<\/code><\/pre>\n<p>\u6709\u4e86\u9019\u500b\u4ee5\u5f8c\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u505a\u4e00\u4e9b\u5f88\u6709\u8da3\u7684\u4e8b\u60c5\uff0c\u4f8b\u5982\u8aaa\u5075\u6e2c\u5230\u67d0\u500b action \u7684\u6642\u5019\uff0c\u6211\u5011\u5c31\u767c\u9001 request\uff0c\u4e26\u4e14\u628a response \u653e\u9032\u53e6\u5916\u4e00\u500b action \u88e1\u9762\u9001\u51fa\u53bb\u3002<\/p>\n<pre><code class=\"lang-js hljs javascript\">Rx.Observable.from(actionStreams)\r\n  .filter(<span class=\"hljs-function\"><span class=\"hljs-params\">action<\/span> =&gt;<\/span> action.type === <span class=\"hljs-string\">'GET_USER_INFO'<\/span>)\r\n  .switchMap(\r\n    <span class=\"hljs-function\"><span class=\"hljs-params\">action<\/span> =&gt;<\/span> Rx.Observable.from(API.getUserInfo(action.payload.userId))\r\n  )\r\n  .subscribe(<span class=\"hljs-function\"><span class=\"hljs-params\">userInfo<\/span> =&gt;<\/span> {\r\n    dispatch({\r\n      <span class=\"hljs-attr\">type<\/span>: <span class=\"hljs-string\">'SET_USER_INFO'<\/span>,\r\n      <span class=\"hljs-attr\">payload<\/span>: userInfo\r\n    })\r\n  })\r\n<\/code><\/pre>\n<p>\u4e0a\u9762\u5c31\u662f\u4e00\u500b\u7c21\u55ae\u7684\u4f8b\u5b50\uff0c\u4f46\u5176\u5be6<code>redux-observable<\/code>\u5df2\u7d93\u5e6b\u6211\u5011\u8655\u7406\u6389\u5f88\u591a\u6771\u897f\u4e86\uff0c\u6240\u4ee5\u6211\u5011\u53ea\u8981\u8a18\u5f97\u4e00\u500b\u6982\u5ff5\uff1a<\/p>\n<blockquote><p>action in, action out<\/p><\/blockquote>\n<p><code>redux-observable<\/code>\u00a0\u662f\u4e00\u500b middleware\uff0c\u4f60\u53ef\u4ee5\u5728\u88e1\u9762\u52a0\u4e0a\u5f88\u591a<code>epic<\/code>\uff0c\u6bcf\u4e00\u500b<code>epic<\/code>\u5c31\u662f\u4e00\u500b Observable\uff0c\u4f60\u53ef\u4ee5\u76e3\u807d\u67d0\u4e00\u500b\u6307\u5b9a\u7684 action\uff0c\u505a\u4e00\u4e9b\u8655\u7406\uff0c\u518d\u8f49\u6210\u53e6\u5916\u4e00\u500b action\u3002<\/p>\n<p>\u76f4\u63a5\u770b\u7a0b\u5f0f\u78bc\u6703\u6bd4\u8f03\u597d\u61c2\uff1a<\/p>\n<pre><code class=\"lang-js hljs javascript\"><span class=\"hljs-keyword\">import<\/span> Actions <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'.\/actions\/user'<\/span>;\r\n<span class=\"hljs-keyword\">import<\/span> ActionTypes <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'.\/actionTypes\/user'<\/span>\r\n\r\n<span class=\"hljs-keyword\">const<\/span> getUserEpic = <span class=\"hljs-function\"><span class=\"hljs-params\">action$<\/span> =&gt;<\/span>\r\n  action$.ofType(actionTypes.GET_USER)\r\n    .switchMap(\r\n      <span class=\"hljs-function\"><span class=\"hljs-params\">action<\/span> =&gt;<\/span> Rx.Observable.from(API.getUserInfo(action.payload.userId))\r\n    ).map(<span class=\"hljs-function\"><span class=\"hljs-params\">userInfo<\/span> =&gt;<\/span> Actions.setUsers(userInfo))\r\n<\/code><\/pre>\n<p>\u5927\u6982\u5c31\u662f\u50cf\u9019\u6a23\uff0c\u6211\u5011\u76e3\u807d\u4e00\u500b action type\uff08GET_USER\uff09\uff0c\u4e00\u63a5\u6536\u5230\u7684\u6642\u5019\u5c31\u767c\u9001 request\uff0c\u4e26\u4e14\u628a\u7d50\u679c\u8f49\u70ba<code>setUsers<\/code>\u9019\u500b action\uff0c\u9019\u5c31\u662f\u6240\u8b02\u7684 action in, action out\u3002<\/p>\n<p>\u9019\u6a23\u7684\u597d\u8655\u662f\u4ec0\u9ebc\uff1f\u597d\u8655\u662f\u660e\u78ba\u5236\u5b9a\u4e86\u4e00\u500b\u898f\u7bc4\uff0c\u7576\u4f60\u7684 component \u9700\u8981\u8cc7\u6599\u7684\u6642\u5019\uff0c\u5c31\u9001\u51fa\u4e00\u500b get \u7684 action\uff0c\u9019\u500b action \u7d93\u904e middleware \u7684\u6642\u5019\u6703\u89f8\u767c epic\uff0cepic \u767c request \u7d66 server \u62ff\u8cc7\u6599\uff0c\u8f49\u6210\u53e6\u5916\u4e00\u500b set \u7684 action\uff0c\u7d93\u904e reducer \u8a2d\u5b9a\u8cc7\u6599\u4ee5\u5f8c\u66f4\u65b0\u5230 component \u7684 props\u3002<\/p>\n<p>\u53ef\u4ee5\u770b\u9019\u5f35\u6d41\u7a0b\u5716\uff1a<\/p>\n<p><img decoding=\"async\" class=\"medium-zoom-image\" src=\"https:\/\/static.coderbridge.com\/img\/techbridge\/images\/huli\/rxjs\/observable.png\" alt=\"\" \/><\/p>\n<p>\u7e3d\u4e4b\u5462\uff0c<code>epic<\/code>\u5c31\u662f\u4e00\u500b Observable\uff0c\u4f60\u53ea\u8981\u78ba\u4fdd\u4f60\u6700\u5f8c\u56de\u50b3\u7684\u6771\u897f\u662f\u4e00\u500b action \u5c31\u597d\uff0c\u90a3\u500b action \u5c31\u6703\u88ab\u9001\u5230 reducer \u53bb\u3002<\/p>\n<p>\u7919\u65bc\u7bc7\u5e45\u7684\u95dc\u4fc2\uff0c\u4eca\u5929\u5c0d\u65bc<code>redux-observable<\/code>\u53ea\u662f\u6982\u5ff5\u6027\u7684\u5e36\u904e\u53bb\u800c\u5df2\uff0c\u6c92\u6709\u6642\u9593\u597d\u597d\u793a\u7bc4\uff0c\u4e4b\u5f8c\u518d\u4f86\u627e\u500b\u6642\u9593\u597d\u597d\u5beb\u4e00\u4e0b<code>redux-observable<\/code>\u7684\u5be6\u6230\u61c9\u7528\u3002<\/p>\n<h1>\u7d50\u8ad6<\/h1>\n<p>\u5f9e\u4e00\u958b\u59cb\u7684\u9663\u5217\u8b1b\u5230 Observable\uff0c\u8b1b\u5230\u756b\u5716\u7684\u7bc4\u4f8b\u518d\u8b1b\u5230\u7d93\u5178\u7684 Auto Complete\uff0c\u6700\u5f8c\u9084\u8b1b\u4e86<code>redux-observable<\/code>\uff0c\u9019\u4e00\u8def\u7684\u904e\u7a0b\u4e2d\uff0c\u5e0c\u671b\u5927\u5bb6\u6709\u9ad4\u6703\u5230 Observable \u5728\u8655\u7406\u975e\u540c\u6b65\u884c\u70ba\u7684\u5f37\u5927\u4e4b\u8655\u4ee5\u53ca\u7c21\u6f54\u3002<\/p>\n<p>\u9019\u7bc7\u7684\u76ee\u7684\u662f\u5e0c\u671b\u80fd\u8b93\u5927\u5bb6\u7406\u89e3 Observable \u5927\u6982\u5728\u505a\u4ec0\u9ebc\uff0c\u4ee5\u53ca\u4ecb\u7d39\u4e00\u4e9b\u7c21\u55ae\u7684\u61c9\u7528\u5834\u666f\uff0c\u5e0c\u671b\u80fd\u63d0\u4f9b\u4e00\u7bc7\u7c21\u55ae\u6613\u61c2\u7684\u4e2d\u6587\u5165\u9580\u6587\u7ae0\uff0c\u8b93\u66f4\u591a\u4eba\u80fd\u9ad4\u6703\u5230 Observable \u7684\u5a01\u529b\u3002<\/p>\n<p>\u559c\u6b61\u9019\u7bc7\u7684\u8a71\u53ef\u4ee5\u5e6b\u5fd9\u5206\u4eab\u51fa\u53bb\uff0c\u767c\u73fe\u54ea\u908a\u6709\u5beb\u932f\u4e5f\u6b61\u8fce\u7559\u8a00\u6307\u6b63\uff0c\u611f\u8b1d\u3002<\/p>\n<p>\u53c3\u8003\u8cc7\u6599\uff1a<\/p>\n<p><a href=\"https:\/\/ithelp.ithome.com.tw\/articles\/10186104\" target=\"_blank\" rel=\"noopener noreferrer\">30 \u5929\u7cbe\u901a RxJS (01)\uff1a\u8a8d\u8b58 RxJS<\/a><br \/>\n<a href=\"http:\/\/blog.techbridge.cc\/2016\/05\/28\/reactive-programming-intro-by-rxjs\/\">Reactive Programming \u7c21\u4ecb\u8207\u6559\u5b78(\u4ee5 RxJS \u70ba\u4f8b)<\/a><br \/>\n<a href=\"https:\/\/gist.github.com\/staltz\/868e7e9bc2a7b8c1f754\" target=\"_blank\" rel=\"noopener noreferrer\">The introduction to Reactive Programming you&#8217;ve been missing<\/a><br \/>\n<a href=\"http:\/\/www.alloyteam.com\/2016\/12\/learn-rxjs\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u6784\u5efa\u6d41\u5f0f\u5e94\u7528\u2014RxJS\u8be6\u89e3<\/a><br \/>\n<a href=\"https:\/\/medium.com\/kevin-salters-blog\/epic-middleware-in-redux-e4385b6ff7c6\" target=\"_blank\" rel=\"noopener noreferrer\">Epic Middleware in Redux<\/a><br \/>\n<a href=\"http:\/\/blog.danieleghidoli.it\/2016\/10\/22\/http-rxjs-observables-angular\/\" target=\"_blank\" rel=\"noopener noreferrer\">Combining multiple Http streams with RxJS Observables in Angular2<\/a><\/p>\n<p>\u5f71\u7247\uff1a<br \/>\n<a href=\"https:\/\/www.youtube.com\/watch?v=AslncyG8whg\" target=\"_blank\" rel=\"noopener noreferrer\">Netflix JavaScript Talks &#8211; RxJS + Redux + React = Amazing!<\/a><br \/>\n<a href=\"https:\/\/www.youtube.com\/watch?v=2LCo926NFLI\" target=\"_blank\" rel=\"noopener noreferrer\">RxJS Quick Start with Practical Examples<\/a><br \/>\n<a href=\"https:\/\/www.youtube.com\/watch?v=ei7FsoXKPl0\" target=\"_blank\" rel=\"noopener noreferrer\">RxJS Observables Crash Course<\/a><br \/>\n<a href=\"https:\/\/www.youtube.com\/watch?v=COviCoUtwx4\" target=\"_blank\" rel=\"noopener noreferrer\">Netflix JavaScript Talks &#8211; RxJS Version 5<\/a><br \/>\n<a href=\"https:\/\/www.youtube.com\/watch?v=3LKMwkuK0ZE\" target=\"_blank\" rel=\"noopener noreferrer\">RxJS 5 Thinking Reactively | Ben Lesh<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u95dc\u6ce8 RxJS \u5df2\u7d93\u597d\u4e00\u6bb5\u6642\u9593\u4e86\uff0c\u6700\u65e9\u77e5\u9053\u9019\u500b\u6771\u897f\u662f\u56e0\u70ba\u00a0redux-observable\uff0c\u662f\u4e00\u500b redux \u7684 middleware\uff0cNetflix \u5229\u7528\u5b83\u4f86\u89e3\u6c7a\u8907\u96dc\u7684\u975e\u540c\u6b65\u76f8\u95dc\u554f\u984c\uff0c\u90a3\u6642\u5019\u6211\u9023redux-saga\u90fd\u9084\u6c92\u641e\u61c2\uff0c\u6c92\u60f3\u5230\u5c31\u53c8\u6709\u65b0\u7684\u6771\u897f\u51fa\u4f86\u4e86\u3002 \u534a\u5e74\u524d\u82b1\u4e86\u4e00\u4e9b\u6642\u9593\uff0c\u627e\u4e86\u5f88\u591a\u7db2\u8def\u4e0a\u7684\u8cc7\u6599\uff0c\u8a66\u5716\u60f3\u8981\u641e\u61c2\u9019\u6574\u500b\u6771\u897f\u3002\u53ef\u662f\u5c0d\u6211\u4f86\u8aaa\uff0c\u5f88\u591a\u6559\u5b78\u7684\u6b65\u8abf\u90fd\u592a\u5feb\u4e86\uff0c\u4e0d\u7136\u5c31\u662f\u8b1b\u5f97\u592a\u4ed4\u7d30\uff0c\u53cd\u800c\u8b93\u521d\u5b78\u8005\u7121\u6240\u9069\u5f9e\u3002 \u9019\u6b21\u6709\u6a5f\u6703\u5728\u516c\u53f8\u7684\u65b0\u5c08\u6848\u88e1\u9762\u5617\u8a66\u5c0e\u5165redux-observable\uff0c\u8eab\u70ba\u63d0\u5021\u8981\u5c0e\u5165\u7684\u4eba\uff0c\u52e2\u5fc5\u8981\u5c0d\u9019\u6771\u897f\u6709\u4e00\u5b9a\u7684\u77ad\u89e3\u3002\u79c9\u6301\u8457\u9019\u500b\u60f3\u6cd5\uff0c\u4e0a\u9031\u8a8d\u771f\u82b1\u4e86\u9ede\u6642\u9593\u518d\u6b21\u628a\u76f8\u95dc\u8cc7\u6e90\u90fd\u7814\u7a76\u4e86\u4e00\u4e0b\uff0c\u6f38\u6f38\u6574\u7406\u51fa\u4e00\u5957\u300c\u6211\u89ba\u5f97\u61c9\u8a72\u53ef\u4ee5\u628a RxJS \u8b1b\u5f97\u66f4\u597d\u61c2\u300d\u7684\u65b9\u6cd5\uff0c\u5728\u9019\u908a\u8ddf\u5927\u5bb6\u5206\u4eab\u4e00\u4e0b\u3002 \u5728\u958b\u59cb\u4e4b\u524d\uff0c\u8981\u5148\u5927\u529b\u7a31\u8b9a\u53bb\u5e74 iT \u90a6\u5e6b\u5fd9\u9435\u4eba\u8cfd\u7684 Web \u7d44\u51a0\u8ecd\uff1a30 \u5929\u7cbe\u901a RxJS\uff0c\u9019\u7cfb\u5217\u6587\u7ae0\u5beb\u5f97\u5f88\u5b8c\u6574\uff0c\u611f\u53d7\u5f97\u51fa\u4f86\u4f5c\u8005\u4e0b\u4e86\u5f88\u591a\u529f\u592b\u5728\u9019\u4e0a\u9762\u3002\u770b\u5b8c\u9019\u7bc7\u4e4b\u5f8c\u5982\u679c\u5c0d\u66f4\u591a\u61c9\u7528\u6709\u8208\u8da3\u7684\uff0c\u53ef\u4ee5\u53bb\u628a\u9019\u7cfb\u5217\u7684\u6587\u7ae0\u8b80\u5b8c\u3002 \u597d\uff0c\u90a3\u5c31\u8b93\u6211\u5011\u958b\u59cb\u5427\uff01 \u8acb\u4f60\u5148\u5fd8\u6389 RxJS \u6c92\u932f\uff0c\u4f60\u6c92\u770b\u932f\u3002 \u8981\u5b78\u6703 RxJS \u7684\u7b2c\u4e00\u4ef6\u4e8b\u60c5\u5c31\u662f\uff1a\u5fd8\u8a18\u5b83\u3002 \u5fd8\u8a18\u6709\u9019\u500b\u6771\u897f\uff0c\u5b8c\u5168\u5fd8\u8a18\uff0c\u5148\u8b93\u6211\u8b1b\u5e7e\u500b\u5176\u4ed6\u6771\u897f\uff0c\u7b49\u6211\u5011\u9700\u8981\u8b1b\u5230 RxJS \u7684\u6642\u5019\u6211\u6703\u518d\u63d0\u9192\u4f60\u7684\u3002 \u5728\u6211\u5011\u8ac7\u5230\u4e3b\u89d2\u4e4b\u524d\uff0c\u5148\u4f86\u505a\u4e00\u4e9b\u6709\u8da3\u7684\u4e8b\u60c5\u5427\uff01 \u7a0b\u5f0f\u57fa\u790e\u80fd\u529b\u6e2c\u8a66 \u5148\u8b93\u6211\u5011\u505a\u4e00\u500b\u7c21\u55ae\u7684\u7df4\u7fd2\u984c\u6696\u8eab\uff0c\u984c\u76ee\u662f\u9019\u6a23\u7684\uff1a \u6709\u4e00\u500b\u9663\u5217\uff0c\u88e1\u9762\u6709\u4e09\u7a2e\u985e\u578b\u7684\u8cc7\u6599\uff1a\u6578\u5b57\u3001a~z\u7d44\u6210\u7684\u5b57\u4e32\u3001\u6578\u5b57\u7d44\u6210\u7684\u5b57\u4e32\uff0c\u8acb\u4f60\u628a\u6bcf\u500b\u6578\u5b57\u4ee5\u53ca\u6578\u5b57\u7d44\u6210\u7684\u5b57\u4e32\u4e58\u4ee5\u4e8c\u4e4b\u5f8c\u52a0\u7e3d \u7bc4\u4f8b\u8f38\u5165\uff1a[1, 5, 9, 3, &#8216;hi&#8217;, &#8216;tb&#8217;, 456, &#8217;11&#8217;, &#8216;yoyoyo&#8217;] \u4f60\u770b\u5b8c\u4e4b\u5f8c\u61c9\u8a72\u6703\u8aaa\uff1a\u300c\u9019\u6709\u4ec0\u9ebc\u96e3\u7684\uff1f\u300d\uff0c\u4e26\u4e14\u5728\u4e00\u5206\u9418\u4ee5\u5167\u5c31\u5beb\u51fa\u4e0b\u9762\u7684\u7a0b\u5f0f\u78bc\uff1a const source = [1, 5, 9, 3, &#8216;hi&#8217;, &#8216;tb&#8217;, 456, &#8217;11&#8217;, &#8216;yoyoyo&#8217;]; &hellip; <a href=\"https:\/\/www.strongd.net\/?p=1562\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">\u5e0c\u671b\u662f\u6700\u6dfa\u986f\u6613\u61c2\u7684 RxJS \u6559\u5b78<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,20],"tags":[243],"class_list":["post-1562","post","type-post","status-publish","format-standard","hentry","category-javascript","category-20","tag-rxjs"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1562","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1562"}],"version-history":[{"count":1,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1562\/revisions"}],"predecessor-version":[{"id":1563,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1562\/revisions\/1563"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1562"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}