{"id":50471,"date":"2025-08-10T08:59:00","date_gmt":"2025-08-10T00:59:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/50471.html"},"modified":"2025-08-10T08:59:00","modified_gmt":"2025-08-10T00:59:00","slug":"9-%e5%a0%86%e5%92%8c%e6%a0%88%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/50471.html","title":{"rendered":"9. \u5806\u548c\u6808\u6709\u4ec0\u4e48\u533a\u522b"},"content":{"rendered":"<h3>\u603b\u7ed3<\/h3>\n<ul>\n<li>\u6808&#xff1a;\u7528\u4e8e\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b&#xff0c;\u901f\u5ea6\u5feb&#xff0c;\u751f\u547d\u5468\u671f\u660e\u786e&#xff1b;<\/li>\n<li>\u5806&#xff1a;\u7528\u4e8e\u5b58\u50a8\u5f15\u7528\u7c7b\u578b&#xff0c;\u7a7a\u95f4\u5927\u4f46\u8bbf\u95ee\u6162&#xff0c;\u4f9d\u8d56\u5783\u573e\u56de\u6536\u673a\u5236&#xff1b;<\/li>\n<li>JavaScript \u4e2d\u53d8\u91cf\u7684\u5b58\u50a8\u65b9\u5f0f\u53d6\u51b3\u4e8e\u5176\u7c7b\u578b&#xff1b;<\/li>\n<li>\u7406\u89e3\u5806\u6808\u673a\u5236\u6709\u52a9\u4e8e\u4f18\u5316\u4ee3\u7801\u6027\u80fd\u3001\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u3002<\/li>\n<\/ul>\n<p>\u2705 \u5efa\u8bae&#xff1a;\u5728\u5f00\u53d1\u4e2d\u5408\u7406\u4f7f\u7528\u57fa\u7840\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b&#xff0c;\u6ce8\u610f\u53d8\u91cf\u4f5c\u7528\u57df\u548c\u5f15\u7528\u5173\u7cfb&#xff0c;\u4ee5\u63d0\u5347\u5e94\u7528\u6027\u80fd\u548c\u7a33\u5b9a\u6027\u3002<\/p>\n<hr \/>\n<h3>\u6982\u8ff0<\/h3>\n<p>\u5728 JavaScript \u4e2d&#xff0c;\u5806&#xff08;Heap&#xff09; \u548c \u6808&#xff08;Stack&#xff09; \u662f\u4e24\u79cd\u4e0d\u540c\u7684\u5185\u5b58\u5206\u914d\u533a\u57df&#xff0c;\u7528\u4e8e\u5b58\u50a8\u7a0b\u5e8f\u8fd0\u884c\u65f6\u7684\u6570\u636e\u3002\u7406\u89e3\u5b83\u4eec\u7684\u533a\u522b\u6709\u52a9\u4e8e\u6211\u4eec\u66f4\u597d\u5730\u7406\u89e3\u53d8\u91cf\u5b58\u50a8\u673a\u5236\u3001\u6027\u80fd\u4f18\u5316\u4ee5\u53ca\u5783\u573e\u56de\u6536\u673a\u5236\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u6808&#xff08;Stack&#xff09;<\/h3>\n<h4>1. \u5b9a\u4e49<\/h4>\n<p>\u6808\u662f\u4e00\u79cd\u81ea\u52a8\u5206\u914d\u548c\u91ca\u653e\u7684\u5185\u5b58\u533a\u57df&#xff0c;\u7528\u4e8e\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b&#xff08;\u5982 number\u3001string\u3001boolean\u3001undefined\u3001null\u3001symbol\u3001bigint&#xff09;\u548c\u51fd\u6570\u8c03\u7528\u65f6\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<h4>2. \u7279\u70b9<\/h4>\n<table>\n<tr>\u7279\u6027\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u5b58\u53d6\u901f\u5ea6\u5feb<\/td>\n<td>\u56e0\u4e3a\u6808\u7684\u7ed3\u6784\u662f\u540e\u8fdb\u5148\u51fa&#xff08;LIFO&#xff09;&#xff0c;\u5185\u5b58\u662f\u8fde\u7eed\u7684<\/td>\n<\/tr>\n<tr>\n<td>\u751f\u547d\u5468\u671f\u660e\u786e<\/td>\n<td>\u53d8\u91cf\u8fdb\u5165\u4f5c\u7528\u57df\u65f6\u5206\u914d\u5185\u5b58&#xff0c;\u79bb\u5f00\u4f5c\u7528\u57df\u65f6\u81ea\u52a8\u91ca\u653e<\/td>\n<\/tr>\n<tr>\n<td>\u7a7a\u95f4\u6709\u9650<\/td>\n<td>\u6808\u7684\u5927\u5c0f\u6709\u9650&#xff0c;\u4e0d\u80fd\u5b58\u653e\u5927\u91cf\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td>\u5b58\u50a8\u57fa\u7840\u7c7b\u578b<\/td>\n<td>\u5982 number, string, boolean \u7b49<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3. \u793a\u4f8b<\/h4>\n<p><span class=\"token keyword\">let<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> b <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><br \/>\nb <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 10<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 20<\/span><\/p>\n<ul>\n<li>a \u548c b \u662f\u4e24\u4e2a\u72ec\u7acb\u7684\u6808\u5185\u5b58\u5730\u5740&#xff0c;\u4e92\u4e0d\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e8c\u3001\u5806&#xff08;Heap&#xff09;<\/h3>\n<h4>1. \u5b9a\u4e49<\/h4>\n<p>\u5806\u662f\u4e00\u79cd\u52a8\u6001\u5206\u914d\u7684\u5185\u5b58\u533a\u57df&#xff0c;\u7528\u4e8e\u5b58\u50a8\u5f15\u7528\u7c7b\u578b&#xff08;\u5982 object\u3001array\u3001function&#xff09;\u7684\u5b9e\u9645\u6570\u636e\u3002<\/p>\n<h4>2. \u7279\u70b9<\/h4>\n<table>\n<tr>\u7279\u6027\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u52a8\u6001\u5206\u914d<\/td>\n<td>\u5185\u5b58\u5927\u5c0f\u4e0d\u56fa\u5b9a&#xff0c;\u8fd0\u884c\u65f6\u52a8\u6001\u5206\u914d<\/td>\n<\/tr>\n<tr>\n<td>\u5b58\u53d6\u901f\u5ea6\u8f83\u6162<\/td>\n<td>\u56e0\u4e3a\u5806\u5185\u5b58\u662f\u65e0\u5e8f\u7684&#xff0c;\u9700\u8981\u901a\u8fc7\u5f15\u7528\u5730\u5740\u8bbf\u95ee<\/td>\n<\/tr>\n<tr>\n<td>\u9700\u8981\u5783\u573e\u56de\u6536<\/td>\n<td>\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u7531\u5783\u573e\u56de\u6536\u673a\u5236\u81ea\u52a8\u6e05\u7406<\/td>\n<\/tr>\n<tr>\n<td>\u5b58\u50a8\u5f15\u7528\u7c7b\u578b<\/td>\n<td>\u5982\u5bf9\u8c61\u3001\u6570\u7ec4\u3001\u51fd\u6570\u7b49<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3. \u793a\u4f8b<\/h4>\n<p><span class=\"token keyword\">let<\/span> obj1 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;Tom&#034;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> obj2 <span class=\"token operator\">&#061;<\/span> obj1<span class=\"token punctuation\">;<\/span><br \/>\nobj2<span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Jerry&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>obj1<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Jerry<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>obj2<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Jerry<\/span><\/p>\n<ul>\n<li>obj1 \u548c obj2 \u6307\u5411\u5806\u4e2d\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61&#xff0c;\u4fee\u6539\u4e00\u4e2a\u4f1a\u5f71\u54cd\u53e6\u4e00\u4e2a\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e09\u3001\u5806\u548c\u6808\u7684\u533a\u522b\u603b\u7ed3<\/h3>\n<table>\n<tr>\u7279\u6027\u6808&#xff08;Stack&#xff09;\u5806&#xff08;Heap&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u5b58\u50a8\u5185\u5bb9<\/td>\n<td>\u57fa\u7840\u6570\u636e\u7c7b\u578b<\/td>\n<td>\u5f15\u7528\u7c7b\u578b&#xff08;\u5bf9\u8c61\u3001\u6570\u7ec4\u3001\u51fd\u6570\u7b49&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u5206\u914d\u65b9\u5f0f<\/td>\n<td>\u81ea\u52a8\u5206\u914d<\/td>\n<td>\u52a8\u6001\u5206\u914d<\/td>\n<\/tr>\n<tr>\n<td>\u5b58\u53d6\u901f\u5ea6<\/td>\n<td>\u5feb<\/td>\n<td>\u76f8\u5bf9\u8f83\u6162<\/td>\n<\/tr>\n<tr>\n<td>\u751f\u547d\u5468\u671f<\/td>\n<td>\u8fdb\u5165\u4f5c\u7528\u57df\u5206\u914d&#xff0c;\u79bb\u5f00\u91ca\u653e<\/td>\n<td>\u624b\u52a8\u5206\u914d&#xff0c;\u7531\u5783\u573e\u56de\u6536\u673a\u5236\u7ba1\u7406<\/td>\n<\/tr>\n<tr>\n<td>\u7a7a\u95f4\u5927\u5c0f<\/td>\n<td>\u5c0f\u4e14\u6709\u9650<\/td>\n<td>\u5927&#xff0c;\u9002\u5408\u5b58\u50a8\u5927\u91cf\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td>\u662f\u5426\u5171\u4eab<\/td>\n<td>\u4e0d\u5171\u4eab<\/td>\n<td>\u591a\u4e2a\u53d8\u91cf\u53ef\u6307\u5411\u540c\u4e00\u5bf9\u8c61<\/td>\n<\/tr>\n<tr>\n<td>\u503c\u4f20\u9012 vs \u5f15\u7528\u4f20\u9012<\/td>\n<td>\u503c\u4f20\u9012&#xff08;\u62f7\u8d1d\u526f\u672c&#xff09;<\/td>\n<td>\u5f15\u7528\u4f20\u9012&#xff08;\u5171\u4eab\u5185\u5b58\u5730\u5740&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u56db\u3001JavaScript \u4e2d\u7684\u5185\u5b58\u7ba1\u7406\u673a\u5236<\/h3>\n<h4>1. \u81ea\u52a8\u5783\u573e\u56de\u6536&#xff08;GC&#xff09;<\/h4>\n<p>JavaScript \u5f15\u64ce&#xff08;\u5982 V8&#xff09;\u4f1a\u81ea\u52a8\u7ba1\u7406\u5185\u5b58\u7684\u5206\u914d\u548c\u56de\u6536&#xff1a;<\/p>\n<ul>\n<li>\u5f53\u4e00\u4e2a\u5bf9\u8c61\u4e0d\u518d\u88ab\u5f15\u7528\u65f6&#xff0c;\u5783\u573e\u56de\u6536\u5668\u4f1a\u5c06\u5176\u4ece\u5806\u4e2d\u6e05\u9664\u3002<\/li>\n<li>\u6808\u4e2d\u7684\u53d8\u91cf\u5728\u4f5c\u7528\u57df\u7ed3\u675f\u540e\u81ea\u52a8\u51fa\u6808&#xff0c;\u65e0\u9700\u624b\u52a8\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<h4>2. \u5783\u573e\u56de\u6536\u7b56\u7565<\/h4>\n<ul>\n<li>\u6807\u8bb0\u6e05\u9664&#xff08;Mark and Sweep&#xff09;&#xff1a;\u4e3b\u6d41\u7b56\u7565&#xff0c;\u6807\u8bb0\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u5e76\u6e05\u9664\u3002<\/li>\n<li>\u5f15\u7528\u8ba1\u6570&#xff08;Reference Counting&#xff09;&#xff1a;\u5df2\u9010\u6e10\u6dd8\u6c70&#xff0c;\u5bb9\u6613\u5bfc\u81f4\u5faa\u73af\u5f15\u7528\u95ee\u9898\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e94\u3001\u6027\u80fd\u4f18\u5316\u5efa\u8bae<\/h3>\n<table>\n<tr>\u5efa\u8bae\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u907f\u514d\u9891\u7e41\u521b\u5efa\u5927\u5bf9\u8c61<\/td>\n<td>\u51cf\u5c11\u5806\u5185\u5b58\u5206\u914d\u548c GC \u538b\u529b<\/td>\n<\/tr>\n<tr>\n<td>\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf<\/td>\n<td>\u5c40\u90e8\u53d8\u91cf\u5b58\u50a8\u5728\u6808\u4e2d&#xff0c;\u8bbf\u95ee\u901f\u5ea6\u5feb<\/td>\n<\/tr>\n<tr>\n<td>\u907f\u514d\u5faa\u73af\u5f15\u7528<\/td>\n<td>\u9632\u6b62\u5185\u5b58\u6cc4\u6f0f<\/td>\n<\/tr>\n<tr>\n<td>\u5408\u7406\u4f7f\u7528 const \u548c let<\/td>\n<td>\u6709\u52a9\u4e8e\u4f18\u5316\u53d8\u91cf\u4f5c\u7528\u57df\u548c\u5185\u5b58\u7ba1\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb505\u6b21\uff0c\u70b9\u8d5e3\u6b21\uff0c\u6536\u85cf12\u6b21\u3002\u6808\uff1a\u7528\u4e8e\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u901f\u5ea6\u5feb\uff0c\u751f\u547d\u5468\u671f\u660e\u786e\uff1b\u5806\uff1a\u7528\u4e8e\u5b58\u50a8\u5f15\u7528\u7c7b\u578b\uff0c\u7a7a\u95f4\u5927\u4f46\u8bbf\u95ee\u6162\uff0c\u4f9d\u8d56\u5783\u573e\u56de\u6536\u673a\u5236\uff1bJavaScript \u4e2d\u53d8\u91cf\u7684\u5b58\u50a8\u65b9\u5f0f\u53d6\u51b3\u4e8e\u5176\u7c7b\u578b\uff1b\u7406\u89e3\u5806\u6808\u673a\u5236\u6709\u52a9\u4e8e\u4f18\u5316\u4ee3\u7801\u6027\u80fd\u3001\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u3002\u2705\u5efa\u8bae\uff1a\u5728\u5f00\u53d1\u4e2d\u5408\u7406\u4f7f\u7528\u57fa\u7840\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\uff0c\u6ce8\u610f\u53d8\u91cf\u4f5c\u7528\u57df\u548c\u5f15\u7528\u5173\u7cfb\uff0c\u4ee5\u63d0\u5347\u5e94\u7528\u6027\u80fd\u548c\u7a33\u5b9a\u6027\u3002\u5728 JavaScript 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