{"id":182,"date":"2026-01-22T10:56:00","date_gmt":"2026-01-22T02:56:00","guid":{"rendered":"https:\/\/mitongxue.cn\/?p=182"},"modified":"2026-06-04T11:04:27","modified_gmt":"2026-06-04T03:04:27","slug":"%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e4%b8%8e%e5%86%85%e5%ad%98%e6%b3%84%e6%bc%8f","status":"publish","type":"post","link":"https:\/\/mitongxue.cn\/index.php\/2026\/01\/22\/%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e4%b8%8e%e5%86%85%e5%ad%98%e6%b3%84%e6%bc%8f\/","title":{"rendered":"\u5783\u573e\u56de\u6536\u4e0e\u5185\u5b58\u6cc4\u6f0f"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4ec0\u4e48\u662f\u5185\u5b58\u6cc4\u9732<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7a0b\u5e8f\u7684\u8fd0\u884c\u9700\u8981\u5185\u5b58\u3002\u53ea\u8981\u7a0b\u5e8f\u63d0\u51fa\u8981\u6c42\uff0c\u64cd\u4f5c\u7cfb\u7edf\u6216\u8005\u8fd0\u884c\u65f6\uff08<em>runtime<\/em>\uff09\u5c31\u5fc5\u987b\u4f9b\u7ed9\u5185\u5b58\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u6301\u7eed\u8fd0\u884c\u7684\u670d\u52a1\u8fdb\u7a0b\uff08<em>daemon<\/em>\uff09\uff0c\u5fc5\u987b\u53ca\u65f6\u91ca\u653e\u4e0d\u518d\u7528\u5230\u7684\u5185\u5b58\u3002\u5426\u5219\uff0c\u5185\u5b58\u5360\u7528\u8d8a\u6765\u8d8a\u9ad8\uff0c\u8f7b\u5219\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\uff0c\u91cd\u5219\u5bfc\u81f4\u8fdb\u7a0b\u5d29\u6e83\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e0d\u518d\u7528\u5230\u7684\u5185\u5b58\uff0c\u5982\u679c\u6ca1\u6709\u53ca\u65f6\u91ca\u653e\uff0c\u5c31\u53eb\u505a\u5185\u5b58\u6cc4\u6f0f\uff08<em>memory leak<\/em>\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><em>JavaScript<\/em> \u4e2d\u7684\u5783\u573e\u56de\u6536<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d4f\u89c8\u5668\u7684 <em>Javascript<\/em> \u5177\u6709\u81ea\u52a8\u5783\u573e\u56de\u6536\u673a\u5236\uff08<em>GC<\/em>\uff1a<em>Garbage Collecation<\/em>\uff09\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6267\u884c\u73af\u5883\u4f1a\u8d1f\u8d23\u7ba1\u7406\u4ee3\u7801\u6267\u884c\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u7684\u5185\u5b58\u3002\u5176\u539f\u7406\u662f\uff1a<strong>\u5783\u573e\u6536\u96c6\u5668\u4f1a\u5b9a\u671f\uff08\u5468\u671f\u6027\uff09\u627e\u51fa\u90a3\u4e9b\u4e0d\u5728\u7ee7\u7eed\u4f7f\u7528\u7684\u53d8\u91cf\uff0c\u7136\u540e\u91ca\u653e\u5176\u5185\u5b58<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\u8fd9\u4e2a\u8fc7\u7a0b\u4e0d\u662f\u5b9e\u65f6\u7684\uff0c\u56e0\u4e3a\u5176\u5f00\u9500\u6bd4\u8f83\u5927\u5e76\u4e14 <em>GC<\/em> \u65f6\u505c\u6b62\u54cd\u5e94\u5176\u4ed6\u64cd\u4f5c\uff0c\u6240\u4ee5\u5783\u573e\u56de\u6536\u5668\u4f1a\u6309\u7167\u56fa\u5b9a\u7684\u65f6\u95f4\u95f4\u9694\u5468\u671f\u6027\u7684\u6267\u884c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u518d\u4f7f\u7528\u7684\u53d8\u91cf\u4e5f\u5c31\u662f\u751f\u547d\u5468\u671f\u7ed3\u675f\u7684\u53d8\u91cf\uff0c\u5f53\u7136\u53ea\u53ef\u80fd\u662f\u5c40\u90e8\u53d8\u91cf\uff0c\u5168\u5c40\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f\u76f4\u81f3\u6d4f\u89c8\u5668\u5378\u8f7d\u9875\u9762\u624d\u4f1a\u7ed3\u675f\u3002\u5c40\u90e8\u53d8\u91cf\u53ea\u5728\u51fd\u6570\u7684\u6267\u884c\u8fc7\u7a0b\u4e2d\u5b58\u5728\uff0c\u800c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u4f1a\u4e3a\u5c40\u90e8\u53d8\u91cf\u5728\u6808\u6216\u5806\u4e0a\u5206\u914d\u76f8\u5e94\u7684\u7a7a\u95f4\uff0c\u4ee5\u5b58\u50a8\u5b83\u4eec\u7684\u503c\uff0c\u7136\u540e\u5728\u51fd\u6570\u4e2d\u4f7f\u7528\u8fd9\u4e9b\u53d8\u91cf\uff0c\u76f4\u81f3\u51fd\u6570\u7ed3\u675f\uff0c\u800c\u95ed\u5305\u4e2d\u7531\u4e8e\u5185\u90e8\u51fd\u6570\u7684\u539f\u56e0\uff0c\u5916\u90e8\u51fd\u6570\u5e76\u4e0d\u80fd\u7b97\u662f\u7ed3\u675f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u95ee\u9898\u5c31\u51fa\u73b0\u4e86\uff1a\u5230\u5e95\u54ea\u4e2a\u53d8\u91cf\u662f\u6ca1\u6709\u7528\u7684\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u5783\u573e\u6536\u96c6\u5668\u5fc5\u987b\u8ddf\u8e2a\u5230\u5e95\u54ea\u4e2a\u53d8\u91cf\u6ca1\u7528\uff0c\u5bf9\u4e8e\u4e0d\u518d\u6709\u7528\u7684\u53d8\u91cf\u6253\u4e0a\u6807\u8bb0\uff0c\u4ee5\u5907\u5c06\u6765\u6536\u56de\u5176\u5185\u5b58\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528\u4e8e\u6807\u8bb0\u7684\u65e0\u7528\u53d8\u91cf\u7684\u7b56\u7565\u53ef\u80fd\u56e0\u5b9e\u73b0\u800c\u6709\u6240\u533a\u522b\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\u6709\u4e24\u79cd\u5b9e\u73b0\u65b9\u5f0f\uff1a<strong>\u6807\u8bb0\u6e05\u9664<\/strong>\u548c<strong>\u5f15\u7528\u8ba1\u6570<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f15\u7528\u8ba1\u6570\u4e0d\u592a\u5e38\u7528\uff0c\u6807\u8bb0\u6e05\u9664\u8f83\u4e3a\u5e38\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6807\u8bb0\u6e05\u9664<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>JavaScript<\/em> \u4e2d\u6700\u5e38\u7528\u7684\u5783\u573e\u56de\u6536\u65b9\u5f0f\u5c31\u662f\u6807\u8bb0\u6e05\u9664\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u53d8\u91cf\u8fdb\u5165\u73af\u5883\u65f6\uff0c\u4f8b\u5982\uff0c\u5728\u51fd\u6570\u4e2d\u58f0\u660e\u4e00\u4e2a\u53d8\u91cf\uff0c\u5c31\u5c06\u8fd9\u4e2a\u53d8\u91cf\u6807\u8bb0\u4e3a\u201c\u8fdb\u5165\u73af\u5883\u201d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u903b\u8f91\u4e0a\u8bb2\uff0c\u6c38\u8fdc\u4e0d\u80fd\u91ca\u653e\u8fdb\u5165\u73af\u5883\u7684\u53d8\u91cf\u6240\u5360\u7528\u7684\u5185\u5b58\uff0c\u56e0\u4e3a\u53ea\u8981\u6267\u884c\u6d41\u8fdb\u5165\u76f8\u5e94\u7684\u73af\u5883\uff0c\u5c31\u53ef\u80fd\u4f1a\u7528\u5230\u5b83\u4eec\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u800c\u5f53\u53d8\u91cf\u79bb\u5f00\u73af\u5883\u65f6\uff0c\u5219\u5c06\u5176\u6807\u8bb0\u4e3a\u201c\u79bb\u5f00\u73af\u5883\u201d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function test(){\n  var a = 10 ; \/\/ \u88ab\u6807\u8bb0 \uff0c\u8fdb\u5165\u73af\u5883 \n  var b = 20 ; \/\/ \u88ab\u6807\u8bb0 \uff0c\u8fdb\u5165\u73af\u5883\n}\ntest(); \/\/ \u6267\u884c\u5b8c\u6bd5 \u4e4b\u540e a\u3001b \u53c8\u88ab\u6807\u79bb\u5f00\u73af\u5883\uff0c\u88ab\u56de\u6536\u3002<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5783\u573e\u56de\u6536\u5668\u5728\u8fd0\u884c\u7684\u65f6\u5019\u4f1a\u7ed9\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u7684\u6240\u6709\u53d8\u91cf\u90fd\u52a0\u4e0a\u6807\u8bb0\uff08\u5f53\u7136\uff0c\u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u6807\u8bb0\u65b9\u5f0f\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e\uff0c\u5b83\u4f1a\u53bb\u6389\u73af\u5883\u4e2d\u7684\u53d8\u91cf\u4ee5\u53ca\u88ab\u73af\u5883\u4e2d\u7684\u53d8\u91cf\u5f15\u7528\u7684\u53d8\u91cf\u7684\u6807\u8bb0\uff08\u95ed\u5305\uff09\u3002\u800c\u5728\u6b64\u4e4b\u540e\u518d\u88ab\u52a0\u4e0a\u6807\u8bb0\u7684\u53d8\u91cf\u5c06\u88ab\u89c6\u4e3a\u51c6\u5907\u5220\u9664\u7684\u53d8\u91cf\uff0c\u539f\u56e0\u662f\u73af\u5883\u4e2d\u7684\u53d8\u91cf\u5df2\u7ecf\u65e0\u6cd5\u8bbf\u95ee\u5230\u8fd9\u4e9b\u53d8\u91cf\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\uff0c\u5783\u573e\u56de\u6536\u5668\u5b8c\u6210\u5185\u5b58\u6e05\u9664\u5de5\u4f5c\uff0c\u9500\u6bc1\u90a3\u4e9b\u5e26\u6807\u8bb0\u7684\u503c\u5e76\u56de\u6536\u5b83\u4eec\u6240\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5230\u76ee\u524d\u4e3a\u6b62\uff0c<em>IE9+\u3001Firefox\u3001Opera\u3001Chrome\u3001Safari<\/em> \u7684 <em>JS<\/em> \u5b9e\u73b0\u4f7f\u7528\u7684\u90fd\u662f\u6807\u8bb0\u6e05\u9664\u7684\u5783\u573e\u56de\u6536\u7b56\u7565\u6216\u7c7b\u4f3c\u7684\u7b56\u7565\uff0c\u53ea\u4e0d\u8fc7\u5783\u573e\u6536\u96c6\u7684\u65f6\u95f4\u95f4\u9694\u4e92\u4e0d\u76f8\u540c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f15\u7528\u8ba1\u6570<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f15\u7528\u8ba1\u6570\u7684\u542b\u4e49\u662f\u8ddf\u8e2a\u8bb0\u5f55\u6bcf\u4e2a\u503c\u88ab\u5f15\u7528\u7684\u6b21\u6570\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u58f0\u660e\u4e86\u4e00\u4e2a\u53d8\u91cf\u5e76\u5c06\u4e00\u4e2a\u5f15\u7528\u7c7b\u578b\u503c\u8d4b\u7ed9\u8be5\u53d8\u91cf\u65f6\uff0c\u5219\u8fd9\u4e2a\u503c\u7684\u5f15\u7528\u6b21\u6570\u5c31\u662f <em>1<\/em>\u3002\u5982\u679c\u540c\u4e00\u4e2a\u503c\u53c8\u88ab\u8d4b\u7ed9\u53e6\u4e00\u4e2a\u53d8\u91cf\uff0c\u5219\u8be5\u503c\u7684\u5f15\u7528\u6b21\u6570\u52a0 <em>1<\/em>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f8\u53cd\uff0c\u5982\u679c\u5305\u542b\u5bf9\u8fd9\u4e2a\u503c\u5f15\u7528\u7684\u53d8\u91cf\u53c8\u53d6\u5f97\u4e86\u53e6\u5916\u4e00\u4e2a\u503c\uff0c\u5219\u8fd9\u4e2a\u503c\u7684\u5f15\u7528\u6b21\u6570\u51cf <em>1<\/em>\u3002\u5f53\u8fd9\u4e2a\u503c\u7684\u5f15\u7528\u6b21\u6570\u53d8\u6210 <em>0<\/em> \u65f6\uff0c\u5219\u8bf4\u660e\u6ca1\u6709\u529e\u6cd5\u518d\u8bbf\u95ee\u8fd9\u4e2a\u503c\u4e86\uff0c\u56e0\u800c\u5c31\u53ef\u4ee5\u5c06\u5176\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u56de\u6536\u56de\u6765\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\uff0c\u5f53\u5783\u573e\u56de\u6536\u5668\u4e0b\u6b21\u518d\u8fd0\u884c\u65f6\uff0c\u5b83\u5c31\u4f1a\u91ca\u653e\u90a3\u4e9b\u5f15\u7528\u6b21\u6570\u4e3a <em>0<\/em> \u7684\u503c\u6240\u5360\u7528\u7684\u5185\u5b58\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function test() {\n    var a = {};\t\/\/ a \u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\u6b21\u6570\u4e3a 1\n    var b = a;\t\/\/ a \u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\u6b21\u6570\u52a0 1\uff0c\u4e3a 2\n    var c = a;\t\/\/ a \u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\u6b21\u6570\u518d\u52a0 1\uff0c\u4e3a 3\n    var b = {};\t\/\/ a \u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\u6b21\u6570\u51cf 1\uff0c\u4e3a 2\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Netscape Navigator3<\/em> \u662f\u6700\u65e9\u4f7f\u7528\u5f15\u7528\u8ba1\u6570\u7b56\u7565\u7684\u6d4f\u89c8\u5668\uff0c\u4f46\u5f88\u5feb\u5b83\u5c31\u9047\u5230\u4e00\u4e2a\u4e25\u91cd\u7684\u95ee\u9898\uff1a<strong>\u5faa\u73af\u5f15\u7528<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5faa\u73af\u5f15\u7528\u6307\u7684\u662f\u5bf9\u8c61 <em>A<\/em> \u4e2d\u5305\u542b\u4e00\u4e2a\u6307\u5411\u5bf9\u8c61B\u7684\u6307\u9488\uff0c\u800c\u5bf9\u8c61 <em>B<\/em> \u4e2d\u4e5f\u5305\u542b\u4e00\u4e2a\u6307\u5411\u5bf9\u8c61 <em>A<\/em> \u7684\u5f15\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function fn() {\n    var a = {};\n    var b = {};\n    a.pro = b;\n    b.pro = a;\n}\nfn();<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u4ee3\u7801 <em>a<\/em> \u548c <em>b<\/em> \u7684\u5f15\u7528\u6b21\u6570\u90fd\u662f <em>2<\/em>\uff0c<em>fn<\/em> \u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u4e24\u4e2a\u5bf9\u8c61\u90fd\u5df2\u7ecf\u79bb\u5f00\u73af\u5883\uff0c\u5728\u6807\u8bb0\u6e05\u9664\u65b9\u5f0f\u4e0b\u662f\u6ca1\u6709\u95ee\u9898\u7684\uff0c\u4f46\u662f\u5728\u5f15\u7528\u8ba1\u6570\u7b56\u7565\u4e0b\uff0c\u56e0\u4e3a <em>a<\/em> \u548c <em>b<\/em> \u7684\u5f15\u7528\u6b21\u6570\u4e0d\u4e3a <em>0<\/em>\uff0c\u6240\u4ee5\u4e0d\u4f1a\u88ab\u5783\u573e\u56de\u6536\u5668\u56de\u6536\u5185\u5b58\uff0c\u5982\u679c <em>fn<\/em> \u51fd\u6570\u88ab\u5927\u91cf\u8c03\u7528\uff0c\u5c31\u4f1a\u9020\u6210\u5185\u5b58\u6cc4\u9732\u3002\u5728 <em>IE7<\/em> \u4e0e <em>IE8<\/em> 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