{"id":438,"date":"2007-11-14T00:00:00","date_gmt":"2007-11-13T16:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=438"},"modified":"2011-07-15T09:56:07","modified_gmt":"2011-07-15T01:56:07","slug":"as3%e6%97%a5%e7%a7%af%e6%9c%88%e7%b4%af3-%e5%88%a9%e7%94%a8as3%e7%9a%84%e5%9b%be%e5%bd%a2%e7%95%8c%e9%9d%a2%e5%bc%80%e5%8f%91%e5%8f%8a%e8%b5%84%e6%ba%90%e7%ae%a1%e7%90%86%e6%94%bb%e7%95%a5","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=438","title":{"rendered":"AS3\u65e5\u79ef\u6708\u7d2f(3) – \u5229\u7528AS3\u7684\u56fe\u5f62\u754c\u9762\u5f00\u53d1\u53ca\u8d44\u6e90\u7ba1\u7406\u653b\u7565"},"content":{"rendered":"

\u539f\u6587\u7ae0\u5730\u5740\uff1a<\/STRONG>http:\/\/as3blog.com\/as3\/as3tip-take-care-of-resource<\/FONT><\/A><\/P>
\n

\u6452\u5f03\u4e86attachMovie\u4e4b\u540e\u7684AS3\uff0c\u91c7\u7528\u4e86\u7c7b\u4f3cDOM\u7684\u64cd\u4f5c\u65b9\u5f0f\u3002addChild\u3001removeChild\u3001getChildAt\u7b49\u65b9\u6cd5\u5f00\u59cb\u6210\u4e3aAS3\u4e2d\u663e\u793a\uff08\u5728\u5c4f\u5e55\u4e0a\u6e32\u67d3\uff09\u3001\u64cd\u4f5c\u56fe\u5f62\u7684\u4e3b\u8981\u65b9\u6cd5\u3002\u7531\u4e8eAS1\u3001AS2\u5b8c\u5168\u662f\u4f9d\u8d56\u4e8eattchMovie\u7684\u601d\u60f3\uff0c\u56e0\u6b64\u5bf9\u4e8e\u4f20\u7edfFlash\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u8f6c\u53d8\u5230\u65b0\u7684addChild\u7684\u786e\u9700\u8981\u4e0b\u4e00\u756a\u529f\u592b\u3002<\/P>
\n

\u7531\u4e8e\u65b0\u7684\u201cDisplayObject\u201d\u5728\u5185\u5b58\u7684\u4f7f\u7528\u4e0a\u975e\u5e38\u201c\u654f\u611f\u201d\u3002\u5f80\u5f80\u7531\u4e8e\u4e0d\u826f\u7684\u7f16\u7a0b\u4e60\u60ef\u4f1a\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u5185\u5b58\u6cc4\u6f0f\uff0c\u56e0\u6b64\uff0c\u6211\u4eec\u4e0d\u5f97\u4e0d\u6bd4AS1\u3001AS2\u65f6\u4ee3\u66f4\u52a0\u6df1\u5165\u5230\u5185\u5b58\u7ba1\u7406\u4e86\u3002\u6211\u60f3\uff0c\u6bcf\u4e00\u4e2aFlash\u5f00\u53d1\u4eba\u5458\uff0c\u5305\u62ec\u6211\u81ea\u5df1\uff0c\u90fd\u5e94\u8be5\u82b1\u4e00\u756a\u529f\u592b\u4ed4\u7ec6\u4f53\u4f1a\u201c\u5185\u5b58\u7ba1\u7406\u201d\u8fd9\u51e0\u4e2a\u5b57\u7684\u542b\u4e49\u3002\u6bd5\u7adf\u6211\u4eec\u5b66\u4e60AS3\u662f\u4e3a\u4e86\u5f00\u53d1\u6bd4AS1\u30012\u65f6\u4ee3\u66f4\u52a0\u5148\u8fdb\u3001\u9ad8\u6548\u800c\u4e14\u5185\u5b58\u5360\u7528\u5c0f\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u5982\u679c\u8fd8\u662f\u5f00\u53d1\u4e00\u4e9b\u7b80\u5355\u7684\u5e94\u7528\uff0c\u4e5f\u5c31\u5931\u53bb\u6211\u4eec\u6bcf\u4e00\u4e2a\u4eba\u4f7f\u7528AS3\u7684\u610f\u4e49\u4e86\u3002<\/P>
\n

\u6211\u89c9\u5f97\uff0c\u7531\u4e8eGC\u662fFlash\u5e94\u7528\u7a0b\u5e8f\u5185\u5b58\u7ba1\u7406\u7684\u6838\u5fc3\uff0c\u6211\u5e94\u8be5\u5148\u4eceAS3\u4e2d\u7684Garbage Collector\uff08\u7b80\u79f0GC\uff09\u5f00\u59cb\u8bf4\u8d77\u3002AS3\u7684GC\u529f\u80fd\u6bd4AS1\u30012\u4e2d\u7684\u8981\u5f3a\u5927\u7684\u591a\u3002\u7136\u800c\uff0c\u5f3a\u5927\u7684\u540c\u65f6\uff0c\u4e5f\u5e26\u6765\u4e86\u4e00\u5b9a\u7a0b\u5ea6\u7684\u590d\u6742\u6027\u3002\u4f46\u662f\u4e5f\u4e0d\u81f3\u4e8e\u975e\u5e38\u590d\u6742\uff0c\u6211\u89c9\u5f97\u6bd4C++\u7b49\u4f20\u7edf\u8bed\u8a00\u8981\u5bb9\u6613\u638c\u63e1\u5f97\u591a\u3002<\/P>
\n

\u5728\u7814\u7a76\u5185\u5b58\u5982\u4f55\u56de\u6536\u4e4b\u524d\uff0c\u5148\u8bf4\u4e00\u4e0b\u53d8\u91cf\u7684\u521b\u5efa\uff1a
\u5728Flash\u4e2d\uff0c\u6211\u4eec\u6bcf\u5efa\u7acb\u4e00\u4e2a\u975e\u539f\u751f\u53d8\u91cf\u65f6\uff08Boolean, String, Number, uint, int\u8fd9\u4e9b\u662f\u539f\u751f\u53d8\u91cf\uff09\uff0c\u8fd9\u4e2a\u53d8\u91cf\u540d\u53ea\u662f\u4e00\u4e2areference\uff08\u6307\u5411\uff0c\u6709\u65f6\u5019\u4e5f\u6210\u4e3a\u201c\u5f15\u7528\u201d\uff09\u800c\u5df2\uff0c\u800c\u5e76\u975e\u8fd9\u4e2a\u53d8\u91cf\u672c\u8eab\u3002\u4f8b\u5982\uff1a
var a:int = 5; \/\/a\u5c31\u662f5
var b:int = a; \/\/b\u662fa\uff0c\u4e5f\u5c31\u662f5
a = 4;
trace(b); \/\/ \u662f5\uff0c\u800c\u4e0d\u662f4\uff01
\/\/\u6539\u53d8b\u7684\u503c\uff0ca\u4e0d\u53d1\u751f\u53d8\u5316\u3002\u53cd\u4e4b\u4ea6\u7136
var c:Object = {name:\u201daw\u201d, blog:\u201dwww.awflasher.com\/blog\u201d}; \/\/c\u53ea\u662f\u6307\u5411\u4e00\u4e2a\u5185\u90e8\u7684Object\uff0c\u4e3a\u4e86\u63cf\u8ff0\u65b9\u4fbf\uff0c\u79f0\u5176\u4e3a\u201cO\u201d
var d:Object = c; \/\/d\u6307\u5411c\uff0c\u6307\u5411\u4e86\u540c\u4e00\u4e2aObject\u201cO\u201d
c.name = \u201cbw\u201d
trace(d.name); \/\/\u4e0d\u662faw\uff0c\u800c\u662fbw\u4e86
\/\/\u6539\u53d8c\u4e5f\u597d\uff0c\u6539\u53d8d\u4e5f\u7f62\uff0c\u5176\u5b9e\u662f\u6539\u53d8\u4e86\u90a3\u4e2a\u201cO\u201d\uff0c\u56e0\u6b64\u6539\u53d8c\u7684\u65f6\u5019\uff0cd\u7684\u503c\u4e5f\u5c31\u53d8\u4e86\u3002\u56e0\u6b64d.name\u5df2\u7ecf\u88ab\u6539\u53d8\u4e3a\u4e86\u201cbw\u201d\u3002<\/P>
\n

\u9996\u5148\uff0c\u660e\u786e\u4e00\u70b9\uff0cGC\u4f1a\u6309\u7167\u4e00\u5b9a\u7684\u65f6\u95f4\u5468\u671f\u8fdb\u884c\u5185\u5b58\u6e05\u7406\uff08memory sweep\uff09\u3002\u56e0\u6b64\u4e0d\u8981\u56e0\u4e3adelete\u6389\u4e00\u4e2aobject\u540e\u68c0\u67e5System.totalMemory\u5185\u5b58\u5c31\u6ca1\u6709\u53cd\u5e94\u800c\u6000\u7591GC\u662f\u5426\u6b63\u5e38\u3002<\/P>
\n

\u90a3\u4e48GC\u4e3a\u4ec0\u4e48\u8981\u6309\u7167\u4e00\u5b9a\u7684\u65f6\u95f4\u5468\u671f\u8fdb\u884c\u6e05\u7406\u5462\u3002\u8fd9\u8fd8\u8981\u5f97\u4eceGC\u7684\u5177\u4f53\u5de5\u4f5c\u539f\u7406\u8bf4\u8d77\u3002<\/P>
\n

GC\u7684\u4e24\u4e2a\u56de\u6536\u4f53\u7cfb\uff1a
1\u3001\u201cReference Counting\u201d – \u5f15\u7528\u8ba1\u6570\u5668
\u8fd9\u4e2a\u4f53\u7cfb\u662f\u81ea\u4eceAS1\u65f6\u4ee3\u5c31\u6709\u7684\u4f53\u7cfb\uff0c\u5b83\u7684\u5de5\u4f5c\u539f\u7406\u975e\u5e38\u7b80\u5355\uff1a\u7cfb\u7edf\u8ba1\u7b97\u6bcf\u4e00\u4e2a\u5bf9\u8c61\u88ab\u6307\u5411\uff0c\u6216\u8005\u8bf4\u5f15\u7528\u7684\u6b21\u6570\u3002\u6bd4\u5982
var a:Object = {name:\u201daw\u201d, blog:\u201dwww.awflasher.com\/blog\u201d};
\u8fd9\u65f6\u5019\uff0c\u8fd9\u4e2aObject\uff08\u6211\u4eec\u4ecd\u7136\u79f0\u4e3a\u201cO\u201d\uff09\uff0c\u6709\u4e00\u6b21\u5f15\u7528\uff0c\u5b83\u7684\u5f15\u7528\u8ba1\u6570\u5668\u4e3a1\uff08\u6765\u81eaa\uff09\u3002
\u6211\u4eec\u518d\u5efa\u7acb\u4e00\u4e2a\u5bf9\u8c61b\uff0c\u5e76\u6307\u5411\u5230a\uff1a
var b:Object = a;
\u8fd9\u65f6\u5019\u201cO\u201d\u5f15\u7528\u8ba1\u6570\u5668\u53d8\u4e3a\u4e862\uff08\u6765\u81eaa\u3001b\uff09
\u6211\u4eec\u5220\u9664\u4e00\u4e2a\uff0c\u6bd4\u5982\u5148\u5220\u9664b\uff1a
delete b;
\u8fd9\u65f6\u5019\u5f15\u7528\u8ba1\u6570\u5668\u4e3a\uff082-1=1\uff091\uff0cGC\u4e0d\u64cd\u4f5c
\u518d\u5220\u9664\u53e6\u5916\u4e00\u4e2aa\uff1a
delete a;
\u201cO\u201d\u5f15\u7528\u8ba1\u6570\u5668\u53d8\u4e3a\uff081-1=0\uff090\uff0cGC\u51fa\u9762\u5e72\u6389\u8fd9\u4e2a\u5bf9\u8c61\u3002
\u8fd9\u5957\u4f53\u7cfb\u5f88\u8f7b\u4fbf\uff0cCPU\u538b\u529b\u8f83\u5c0f\u3002\u4f46\u662f\u5b83\u4e5f\u6709\u7f3a\u9677\u3002\u5f53\u6211\u4eec\u7684\u5bf9\u8c61\u5185\u90e8\u4e92\u76f8\u5f15\u7528\u7684\u65f6\u5019\uff0c\u9ebb\u70e6\u5c31\u6765\u4e86\u3002\u4f8b\u5982\uff1a
var a:Object = {name:\u201daw\u201d, description:\u201dunknown\u201d};
\/\/ \u5efa\u7acb\u4e00\u4e2a\u5bf9\u8c61a\uff0c\u4ecd\u7136\u5047\u8bbe\u5185\u90e8\u5bf9\u8c61\u4e3a\u201cO\u201d\uff0c\u8fd9\u65f6O\u7684\u5f15\u7528\u6b21\u6570\u4e3a1
var b:Object = {nameObj:a, url:\u201dawflasher.com\u201d};
\/\/ b\u5f15\u7528\u4e86a\uff0c\u540c\u65f6\u521b\u5efa\u4e86\u65b0\u7684\u5185\u90e8\u5bf9\u8c61\u201cP\u201d\u3002\u8fd9\u65f6O\u7684\u5f15\u7528\u6b21\u6570\u4e3a2\uff0cP\u4e3a1
a.myDescription = b;
\/\/ a\u7684myDescription\u5c5e\u6027\u6307\u5411\u5230\u4e86b\u3002\u8fd9\u6837\uff0cP\u7684\u5f15\u7528\u6b21\u6570\u4e5f\u4e3a2\u4e86\u3002
\/\/ \u662f\u4e0d\u662f\u6709\u70b9\u5934\u6655\uff1f\u9759\u4e0b\u6765\uff0c\u753b\u4e2a\u56fe\u6162\u6162\u770b\u770b\uff1a\uff09
delete a;
delete b;
\u4e24\u6b21delete\u64cd\u4f5c\u540e\uff0cO\u3001P\u7684\u5f15\u7528\u6b21\u6570\u90fd\u662f1\uff0c\u5b83\u4eec\u5c06\u7ee7\u7eed\u5360\u7528\u4f60\u7684\u5185\u5b58\u3002\u201cReference Counting\u201d \u4f53\u7cfb\u65e0\u80fd\u4e3a\u529b\u4e86\u3002<\/P>
\n

2\u3001\u201cMark Sweeping\u201d – \u6807\u8bb0\u6e05\u9664\u6cd5\u5219
GC\u7684\u7b2c\u4e00\u79cd\u673a\u5236\u201cReference Counting\u201d\uff0c\u5728FlashPlayer8\u4e4b\u524d\u662fGC\u552f\u4e00\u7684\u673a\u5236\u3002FlashPlayer6\u548c7\u7531\u4e8e\u5f15\u5165\u4e86\u590d\u6742\u7684OOP\u5f00\u53d1\u6a21\u5f0f\uff0c\u5c24\u5176\u662f7\u5f15\u5165\u4e86\u7c7b\u4f3cJava\u3001C++\u7b49\u5f3a\u5927OOP\u8bed\u8a00\u7684\u8bed\u6cd5\u3002\u5229\u7528Flash\u8bbe\u8ba1\u7684\u590d\u6742\u9879\u76ee\u8d8a\u6765\u8d8a\u591a\u3002\u7531\u4e8eFlash\u5f00\u53d1\u4eba\u5458\u5927\u591a\u4e0d\u4e86\u89e3GC\uff0c\u800cJava\u3001C++\u7684\u5f00\u53d1\u4eba\u5458\u53c8\u5df2\u7ecf\u4e60\u60ef\u4e86\u5f3a\u5927\u7684GC\uff08\u65e0\u8bba\u662f\u81ea\u52a8\u7684\u8fd8\u662f\u624b\u52a8\u7684\uff09\u3002\u56e0\u6b64FlashPlayer6\u30017\u7684\u5185\u5b58\u95ee\u9898\u5f00\u59cb\u6d6e\u73b0\u51fa\u6765\u3002
Okay\uff0cFlash Player8\u5f15\u5165\u4e86\u65b0\u7684\u201cMark Sweeping\u201d\u673a\u5236\u3002\u6211\u60f3\u8fd9\u4e5f\u662f\u5f53\u5e74Marcomedia\uff08Adobe\uff09\u6025\u4e8e\u63a8\u51faPlayer8\u7684\u539f\u56e0\u5427\uff01\uff08\u8fd8\u8bb0\u5f97\u5f53\u5e74Flash8\u7684\u4ecb\u7ecd\u89c6\u9891\u4e48\uff0c\u6548\u7387\u63d0\u9ad8\u662f\u4e00\u4e2a\u9769\u547d\u6027\u7684\u6539\u8fdb\uff09
\u4e0b\u9762\u5c31\u6765\u8bb2\u8ff0\u201cMark Sweeping\u201d – \u6807\u8bb0\u6e05\u9664\u6cd5\u5219\u7684\u5de5\u4f5c\u539f\u7406\u3002
FlashPlayer\u4f1a\u4eceroot\u5f00\u59cb\uff0c\u904d\u5386\u7cfb\u7edf\u7684\u6bcf\u4e00\u4e2a\u53d8\u91cf\uff0c\u5e76\u5bf9\u6709\u6307\u5411\u7684\u5bf9\u8c61\u4e4b\u95f4\uff0c\u8bb0\u5f55\u4e00\u6b21\u8054\u7cfb\u3002\u5728\u904d\u5386\u7ed3\u675f\u4e4b\u540e\uff0c\u51e1\u662f\u4e0eroot\u4e0d\u76f8\u8054\u7cfb\u7684\u5bf9\u8c61\uff0c\u88abFlashPlayer\u65e0\u60c5\u5730\u5e72\u6389\uff1a\uff09
Okay\uff0c\u56de\u5230\u521a\u624d\u7684\u4f8b\u5b50\uff0c\u5f53\u6211\u4eecdelete a\uff0c\u5e76delete b\u4e4b\u540e\uff0croot\u4e0eO\u3001P\u5c31\u5212\u6e05\u4e86\u754c\u7ebf\u3002\u8fd9\u65f6\u5019\uff0cGC\u5c31\u53ef\u4ee5\u8fdb\u884c\u4e00\u6b21\u8083\u6e05\u4e86\u3002
\u7136\u800c\uff0c\u7531\u4e8e\u8fd9\u79cd\u201cMark Sweeping\u201d\u8981\u904d\u5386\u6240\u6709\u7684\u5bf9\u8c61\uff0c\u56e0\u6b64\u975e\u5e38\u6d88\u8017\u8d44\u6e90\u3002\u8fd9\u4e5f\u5c31\u56de\u5230\u4e86\u5f53\u521d\u7684\u95ee\u9898\uff1a\u201cGC\u4e3a\u4ec0\u4e48\u8981\u6309\u7167\u4e00\u5b9a\u7684\u65f6\u95f4\u5468\u671f\u8fdb\u884c\u6e05\u7406\u201c – \u56e0\u4e3a\u4e0d\u80fd\u7ed9CPU\u9020\u6210\u592a\u5927\u7684\u8d1f\u62c5\u3002
\u6211\u4e2a\u4eba\u731c\u6d4b\uff0cGC\u7684\u5185\u90e8\u6e05\u9664\u7b56\u7565\u5e94\u8be5\u662f\u5728\u67d0\u4e00\u6b21\u4e8b\u4ef6\uff08\u4f8b\u5982delete\uff09\u53d1\u751f\u540e\uff0c\u5728CPU\u6bd4\u8f83\u7a7a\u95f2\u3001RAM\u5206\u914d\u76f8\u5bf9\u5408\u7406\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u3002<\/P>
\n

3\u3001\u5173\u4e8edelete\u3002Gskinner\u300aUnderstanding Delete<\/FONT><\/A>\u300b\u8bf4\u7684\u5f88\u6e05\u695a\uff1a
delete\u5728AS3\u4e2d\uff0c\u53ea\u80fd\u5220\u9664dynamic\u7c7b\u7684\u5bf9\u8c61\u5b9e\u4f8b\u7684\u5c5e\u6027\/\u65b9\u6cd5\u4e86\u3002\u8fd9\u610f\u5473\u7740\u4f60\u4e0d\u80fd\u50cfAS2\u90a3\u6837\u7528delete\u968f\u610f\u5220\u9664\u6210\u5458\u4e86\u3002\u5f53\u7136\uff0c\u66ff\u4ee3\u65b9\u6cd5\u8fd8\u662f\u6709\u7684\uff1a\u628a\u6210\u5458\u8bbe\u7f6e\u4e3anull\u5373\u53ef\u3002\u4f8b\u5982myobj.name=null;<\/P>
\n

Okay\uff0c\u4e0d\u8981\u4ee5\u4e3a\u6709\u4e86\u201cMark Sweeping\u201d\u5c31\u4e07\u4e8b\u5927\u5409\u4e86\u3002\u7531\u4e8eGC\u4e0d\u4f1a\u5373\u65f6\u8fdb\u884c\uff0c\u56e0\u6b64\u4f60\u7684\u5bf9\u8c61\u4f1a\u5728\u4e00\u6bb5\u65f6\u95f4\u5185\u201c\u9634\u9b42\u4e0d\u6563\u201d\uff01\u5bf9\u4e8e\u4e00\u4e2a\u8ffd\u6c42\u5b8c\u7f8e\u7684\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u5185\u90e8\u7684\u67d0\u4e9b\u673a\u5236\u4f1a\u5728\u88ab\u5220\u9664\u4e4b\u540e\u7ee7\u7eed\u5de5\u4f5c\uff1aAS\u8bed\u53e5\u4f1a\u7ee7\u7eed\u6267\u884c\u3001\u58f0\u97f3\u4f1a\u7ee7\u7eed\u64ad\u653e\u3001\u4e8b\u4ef6\u4f1a\u7ee7\u7eed\u89e6\u53d1\uff01<\/P>
\n

KirupaForum\u6709\u7f51\u53cb\u8bf4\uff0c\u201cAll you got to do is pray the garbage collector doesn\u2019t break down.\u201d\uff0c\u786e\u5b9e\uff0c\u5982\u679c\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u8981\u8fd0\u884c\u4e0a\u4e00\u4e2a\u591a\u5c0f\u65f6\uff0c\u90a3\u4e48\u6162\u6162\u6d41\u901d\u7684\u5185\u5b58\u4f1a\u8ba9\u4f60\u7684\u7528\u6237\u5bf9\u4f60\u7684\u4ea7\u54c1\u5931\u671b\uff08\u4f8b\u5982\u6e38\u620f\uff09\u3002\u56e0\u6b64\u6211\u4eec\u9700\u8981\u6709\u4e00\u4e2a\u826f\u597d\u7684\u8d44\u6e90\u7ba1\u7406\u7b56\u7565\u3002<\/P>
\n

<\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"

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