{"id":1388,"date":"2024-06-02T22:33:18","date_gmt":"2024-06-02T22:33:18","guid":{"rendered":""},"modified":"2024-06-05T03:10:11","modified_gmt":"2024-06-04T19:10:11","slug":"javascript%e6%b7%b1%e5%85%a5%e4%b9%8b%e4%bd%9c%e7%94%a8%e5%9f%9f%e9%93%be","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1388","title":{"rendered":"JavaScript\u6df1\u5165\u4e4b\u4f5c\u7528\u57df\u94fe"},"content":{"rendered":"<td class=\"d-block comment-body markdown-body  js-comment-body\">\n<h2 dir=\"auto\">\u524d\u8a00<\/h2>\n<p dir=\"auto\">\u5728<a href=\"https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/4\" data-hovercard-type=\"issue\" data-hovercard-url=\"\/mqyqingfeng\/Blog\/issues\/4\/hovercard\">\u300aJavaScript\u6df1\u5165\u4e4b\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u300b<\/a>\u4e2d\u8bb2\u5230\uff0c\u5f53JavaScript\u4ee3\u7801\u6267\u884c\u4e00\u6bb5\u53ef\u6267\u884c\u4ee3\u7801(executable code)\u65f6\uff0c\u4f1a\u521b\u5efa\u5bf9\u5e94\u7684\u6267\u884c\u4e0a\u4e0b\u6587(execution context)\u3002<\/p>\n<p dir=\"auto\">\u5bf9\u4e8e\u6bcf\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u90fd\u6709\u4e09\u4e2a\u91cd\u8981\u5c5e\u6027\uff1a<\/p>\n<ul dir=\"auto\">\n<li>\u53d8\u91cf\u5bf9\u8c61(Variable object\uff0cVO)<\/li>\n<li>\u4f5c\u7528\u57df\u94fe(Scope chain)<\/li>\n<li>this<\/li>\n<\/ul>\n<p dir=\"auto\">\u4eca\u5929\u91cd\u70b9\u8bb2\u8bb2\u4f5c\u7528\u57df\u94fe\u3002<\/p>\n<h2 dir=\"auto\">\u4f5c\u7528\u57df\u94fe<\/h2>\n<p dir=\"auto\">\u5728<a href=\"https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/5\" data-hovercard-type=\"issue\" data-hovercard-url=\"\/mqyqingfeng\/Blog\/issues\/5\/hovercard\">\u300aJavaScript\u6df1\u5165\u4e4b\u53d8\u91cf\u5bf9\u8c61\u300b<\/a>\u4e2d\u8bb2\u5230\uff0c\u5f53\u67e5\u627e\u53d8\u91cf\u7684\u65f6\u5019\uff0c\u4f1a\u5148\u4ece\u5f53\u524d\u4e0a\u4e0b\u6587\u7684\u53d8\u91cf\u5bf9\u8c61\u4e2d\u67e5\u627e\uff0c\u5982\u679c\u6ca1\u6709\u627e\u5230\uff0c\u5c31\u4f1a\u4ece\u7236\u7ea7(\u8bcd\u6cd5\u5c42\u9762\u4e0a\u7684\u7236\u7ea7)\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u53d8\u91cf\u5bf9\u8c61\u4e2d\u67e5\u627e\uff0c\u4e00\u76f4\u627e\u5230\u5168\u5c40\u4e0a\u4e0b\u6587\u7684\u53d8\u91cf\u5bf9\u8c61\uff0c\u4e5f\u5c31\u662f\u5168\u5c40\u5bf9\u8c61\u3002\u8fd9\u6837\u7531\u591a\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u53d8\u91cf\u5bf9\u8c61\u6784\u6210\u7684\u94fe\u8868\u5c31\u53eb\u505a\u4f5c\u7528\u57df\u94fe\u3002<\/p>\n<p dir=\"auto\">\u4e0b\u9762\uff0c\u8ba9\u6211\u4eec\u4ee5\u4e00\u4e2a\u51fd\u6570\u7684\u521b\u5efa\u548c\u6fc0\u6d3b\u4e24\u4e2a\u65f6\u671f\u6765\u8bb2\u89e3\u4f5c\u7528\u57df\u94fe\u662f\u5982\u4f55\u521b\u5efa\u548c\u53d8\u5316\u7684\u3002<\/p>\n<h2 dir=\"auto\">\u51fd\u6570\u521b\u5efa<\/h2>\n<p dir=\"auto\">\u5728<a href=\"https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/3\" data-hovercard-type=\"issue\" data-hovercard-url=\"\/mqyqingfeng\/Blog\/issues\/3\/hovercard\">\u300aJavaScript\u6df1\u5165\u4e4b\u8bcd\u6cd5\u4f5c\u7528\u57df\u548c\u52a8\u6001\u4f5c\u7528\u57df\u300b<\/a>\u4e2d\u8bb2\u5230\uff0c\u51fd\u6570\u7684\u4f5c\u7528\u57df\u5728\u51fd\u6570\u5b9a\u4e49\u7684\u65f6\u5019\u5c31\u51b3\u5b9a\u4e86\u3002<\/p>\n<p dir=\"auto\">\u8fd9\u662f\u56e0\u4e3a\u51fd\u6570\u6709\u4e00\u4e2a\u5185\u90e8\u5c5e\u6027 [[scope]]\uff0c\u5f53\u51fd\u6570\u521b\u5efa\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u4fdd\u5b58\u6240\u6709\u7236\u53d8\u91cf\u5bf9\u8c61\u5230\u5176\u4e2d\uff0c\u4f60\u53ef\u4ee5\u7406\u89e3 [[scope]] \u5c31\u662f\u6240\u6709\u7236\u53d8\u91cf\u5bf9\u8c61\u7684\u5c42\u7ea7\u94fe\uff0c\u4f46\u662f\u6ce8\u610f\uff1a[[scope]] \u5e76\u4e0d\u4ee3\u8868\u5b8c\u6574\u7684\u4f5c\u7528\u57df\u94fe\uff01<\/p>\n<p dir=\"auto\">\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\" \nfunction foo() {\n    function bar() {\n        ...\n    }\n}\n\"><\/p>\n<pre class=\"notranslate\"> \n<span class=\"pl-k\">function<\/span> <span class=\"pl-en\">foo<\/span><span class=\"pl-kos\">(<\/span><span class=\"pl-kos\">)<\/span> <span class=\"pl-kos\">{<\/span>\n    <span class=\"pl-k\">function<\/span> <span class=\"pl-en\">bar<\/span><span class=\"pl-kos\">(<\/span><span class=\"pl-kos\">)<\/span> <span class=\"pl-kos\">{<\/span>\n        ...\n    <span class=\"pl-kos\">}<\/span>\n<span class=\"pl-kos\">}<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">\u51fd\u6570\u521b\u5efa\u65f6\uff0c\u5404\u81ea\u7684[[scope]]\u4e3a\uff1a<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\nfoo.[[scope]] = [\n  globalContext.VO\n];\n\nbar.[[scope]] = [\n    fooContext.AO,\n    globalContext.VO\n];\n\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-s1\">foo<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-c1\"><\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-s1\">scope<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">[<\/span>\n  <span class=\"pl-s1\">globalContext<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-c1\">VO<\/span>\n<span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">;<\/span>\n\n<span class=\"pl-s1\">bar<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-c1\"><\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-s1\">scope<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">[<\/span>\n    <span class=\"pl-s1\">fooContext<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-c1\">AO<\/span><span class=\"pl-kos\">,<\/span>\n    <span class=\"pl-s1\">globalContext<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-c1\">VO<\/span>\n<span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">;<\/span><\/pre>\n<\/div>\n<h2 dir=\"auto\">\u51fd\u6570\u6fc0\u6d3b<\/h2>\n<p dir=\"auto\">\u5f53\u51fd\u6570\u6fc0\u6d3b\u65f6\uff0c\u8fdb\u5165\u51fd\u6570\u4e0a\u4e0b\u6587\uff0c\u521b\u5efa VO\/AO \u540e\uff0c\u5c31\u4f1a\u5c06\u6d3b\u52a8\u5bf9\u8c61\u6dfb\u52a0\u5230\u4f5c\u7528\u94fe\u7684\u524d\u7aef\u3002<\/p>\n<p dir=\"auto\">\u8fd9\u65f6\u5019\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u4f5c\u7528\u57df\u94fe\uff0c\u6211\u4eec\u547d\u540d\u4e3a Scope\uff1a<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\nScope = [AO].concat([[Scope]]);\n\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-v\">Scope<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">[<\/span><span class=\"pl-c1\">AO<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-en\">concat<\/span><span class=\"pl-kos\">(<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-v\">Scope<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">)<\/span><span class=\"pl-kos\">;<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">\u81f3\u6b64\uff0c\u4f5c\u7528\u57df\u94fe\u521b\u5efa\u5b8c\u6bd5\u3002<\/p>\n<h2 dir=\"auto\">\u634b\u4e00\u634b<\/h2>\n<p dir=\"auto\">\u4ee5\u4e0b\u9762\u7684\u4f8b\u5b50\u4e3a\u4f8b\uff0c\u7ed3\u5408\u7740\u4e4b\u524d\u8bb2\u7684\u53d8\u91cf\u5bf9\u8c61\u548c\u6267\u884c\u4e0a\u4e0b\u6587\u6808\uff0c\u6211\u4eec\u6765\u603b\u7ed3\u4e00\u4e0b\u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\u4e2d\u4f5c\u7528\u57df\u94fe\u548c\u53d8\u91cf\u5bf9\u8c61\u7684\u521b\u5efa\u8fc7\u7a0b\uff1a<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"var scope = &quot;global scope&quot;;\nfunction checkscope(){\n    var scope2 = 'local scope';\n    return scope2;\n}\ncheckscope();\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-k\">var<\/span> <span class=\"pl-s1\">scope<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-s\">\"global scope\"<\/span><span class=\"pl-kos\">;<\/span>\n<span class=\"pl-k\">function<\/span> <span class=\"pl-en\">checkscope<\/span><span class=\"pl-kos\">(<\/span><span class=\"pl-kos\">)<\/span><span class=\"pl-kos\">{<\/span>\n    <span class=\"pl-k\">var<\/span> <span class=\"pl-s1\">scope2<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-s\">'local scope'<\/span><span class=\"pl-kos\">;<\/span>\n    <span class=\"pl-k\">return<\/span> <span class=\"pl-s1\">scope2<\/span><span class=\"pl-kos\">;<\/span>\n<span class=\"pl-kos\">}<\/span>\n<span class=\"pl-en\">checkscope<\/span><span class=\"pl-kos\">(<\/span><span class=\"pl-kos\">)<\/span><span class=\"pl-kos\">;<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">\u6267\u884c\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<p dir=\"auto\">1.checkscope \u51fd\u6570\u88ab\u521b\u5efa\uff0c\u4fdd\u5b58\u4f5c\u7528\u57df\u94fe\u5230 \u5185\u90e8\u5c5e\u6027[[scope]]<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"checkscope.[[scope]] = [\n    globalContext.VO\n];\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-s1\">checkscope<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-c1\"><\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-s1\">scope<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">[<\/span>\n    <span class=\"pl-s1\">globalContext<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-c1\">VO<\/span>\n<span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">;<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">2.\u6267\u884c checkscope \u51fd\u6570\uff0c\u521b\u5efa checkscope \u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\uff0ccheckscope \u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\u88ab\u538b\u5165\u6267\u884c\u4e0a\u4e0b\u6587\u6808<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"ECStack = [\n    checkscopeContext,\n    globalContext\n];\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-v\">ECStack<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">[<\/span>\n    <span class=\"pl-s1\">checkscopeContext<\/span><span class=\"pl-kos\">,<\/span>\n    <span class=\"pl-s1\">globalContext<\/span>\n<span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">;<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">3.checkscope \u51fd\u6570\u5e76\u4e0d\u7acb\u523b\u6267\u884c\uff0c\u5f00\u59cb\u505a\u51c6\u5907\u5de5\u4f5c\uff0c\u7b2c\u4e00\u6b65\uff1a\u590d\u5236\u51fd\u6570[[scope]]\u5c5e\u6027\u521b\u5efa\u4f5c\u7528\u57df\u94fe<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"checkscopeContext = {\n    Scope: checkscope.[[scope]],\n}\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-s1\">checkscopeContext<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">{<\/span>\n    <span class=\"pl-c1\">Scope<\/span>: <span class=\"pl-s1\">checkscope<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-c1\"><\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-s1\">scope<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">,<\/span>\n<span class=\"pl-kos\">}<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">4.\u7b2c\u4e8c\u6b65\uff1a\u7528 arguments \u521b\u5efa\u6d3b\u52a8\u5bf9\u8c61\uff0c\u968f\u540e\u521d\u59cb\u5316\u6d3b\u52a8\u5bf9\u8c61\uff0c\u52a0\u5165\u5f62\u53c2\u3001\u51fd\u6570\u58f0\u660e\u3001\u53d8\u91cf\u58f0\u660e<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"checkscopeContext = {\n    AO: {\n        arguments: {\n            length: 0\n        },\n        scope2: undefined\n    }\uff0c\n    Scope: checkscope.[[scope]],\n}\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-s1\">checkscopeContext<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">{<\/span>\n    <span class=\"pl-c1\">AO<\/span>: <span class=\"pl-kos\">{<\/span>\n        <span class=\"pl-c1\">arguments<\/span>: <span class=\"pl-kos\">{<\/span>\n            <span class=\"pl-c1\">length<\/span>: <span class=\"pl-c1\">0<\/span>\n        <span class=\"pl-kos\">}<\/span><span class=\"pl-kos\">,<\/span>\n        <span class=\"pl-c1\">scope2<\/span>: <span class=\"pl-c1\">undefined<\/span>\n    <span class=\"pl-kos\">}<\/span><span class=\"pl-s1\">\uff0c<\/span>\n    <span class=\"pl-v\">Scope<\/span>: <span class=\"pl-s1\">checkscope<\/span><span class=\"pl-kos\">.<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-s1\">scope<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">,<\/span>\n<span class=\"pl-kos\">}<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">5.\u7b2c\u4e09\u6b65\uff1a\u5c06\u6d3b\u52a8\u5bf9\u8c61\u538b\u5165 checkscope \u4f5c\u7528\u57df\u94fe\u9876\u7aef<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"checkscopeContext = {\n    AO: {\n        arguments: {\n            length: 0\n        },\n        scope2: undefined\n    },\n    Scope: [AO, [[Scope]]]\n}\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-s1\">checkscopeContext<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">{<\/span>\n    <span class=\"pl-c1\">AO<\/span>: <span class=\"pl-kos\">{<\/span>\n        <span class=\"pl-c1\">arguments<\/span>: <span class=\"pl-kos\">{<\/span>\n            <span class=\"pl-c1\">length<\/span>: <span class=\"pl-c1\">0<\/span>\n        <span class=\"pl-kos\">}<\/span><span class=\"pl-kos\">,<\/span>\n        <span class=\"pl-c1\">scope2<\/span>: <span class=\"pl-c1\">undefined<\/span>\n    <span class=\"pl-kos\">}<\/span><span class=\"pl-kos\">,<\/span>\n    <span class=\"pl-c1\">Scope<\/span>: <span class=\"pl-kos\">[<\/span><span class=\"pl-c1\">AO<\/span><span class=\"pl-kos\">,<\/span> <span class=\"pl-kos\">[<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-v\">Scope<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span>\n<span class=\"pl-kos\">}<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">6.\u51c6\u5907\u5de5\u4f5c\u505a\u5b8c\uff0c\u5f00\u59cb\u6267\u884c\u51fd\u6570\uff0c\u968f\u7740\u51fd\u6570\u7684\u6267\u884c\uff0c\u4fee\u6539 AO \u7684\u5c5e\u6027\u503c<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"checkscopeContext = {\n    AO: {\n        arguments: {\n            length: 0\n        },\n        scope2: 'local scope'\n    },\n    Scope: [AO, [[Scope]]]\n}\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-s1\">checkscopeContext<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">{<\/span>\n    <span class=\"pl-c1\">AO<\/span>: <span class=\"pl-kos\">{<\/span>\n        <span class=\"pl-c1\">arguments<\/span>: <span class=\"pl-kos\">{<\/span>\n            <span class=\"pl-c1\">length<\/span>: <span class=\"pl-c1\">0<\/span>\n        <span class=\"pl-kos\">}<\/span><span class=\"pl-kos\">,<\/span>\n        <span class=\"pl-c1\">scope2<\/span>: <span class=\"pl-s\">'local scope'<\/span>\n    <span class=\"pl-kos\">}<\/span><span class=\"pl-kos\">,<\/span>\n    <span class=\"pl-c1\">Scope<\/span>: <span class=\"pl-kos\">[<\/span><span class=\"pl-c1\">AO<\/span><span class=\"pl-kos\">,<\/span> <span class=\"pl-kos\">[<\/span><span class=\"pl-kos\">[<\/span><span class=\"pl-v\">Scope<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">]<\/span>\n<span class=\"pl-kos\">}<\/span><\/pre>\n<\/div>\n<p dir=\"auto\">7.\u67e5\u627e\u5230 scope2 \u7684\u503c\uff0c\u8fd4\u56de\u540e\u51fd\u6570\u6267\u884c\u5b8c\u6bd5\uff0c\u51fd\u6570\u4e0a\u4e0b\u6587\u4ece\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u4e2d\u5f39\u51fa<\/p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"ECStack = [\n    globalContext\n];\"><\/p>\n<pre class=\"notranslate\"><span class=\"pl-v\">ECStack<\/span> <span class=\"pl-c1\">=<\/span> <span class=\"pl-kos\">[<\/span>\n    <span class=\"pl-s1\">globalContext<\/span>\n<span class=\"pl-kos\">]<\/span><span class=\"pl-kos\">;<\/span><\/pre>\n<\/div>\n<h2 dir=\"auto\">\u4e0b\u4e00\u7bc7\u6587\u7ae0<\/h2>\n<p dir=\"auto\"><a href=\"https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/7\" data-hovercard-type=\"issue\" data-hovercard-url=\"\/mqyqingfeng\/Blog\/issues\/7\/hovercard\">\u300aJavaScript\u6df1\u5165\u4e4b\u4eceECMAScript\u89c4\u8303\u89e3\u8bfbthis\u300b<\/a><\/p>\n<h2 dir=\"auto\">\u672c\u6587\u76f8\u5173\u94fe\u63a5<\/h2>\n<p dir=\"auto\"><a href=\"https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/3\" data-hovercard-type=\"issue\" data-hovercard-url=\"\/mqyqingfeng\/Blog\/issues\/3\/hovercard\">\u300aJavaScript\u6df1\u5165\u4e4b\u8bcd\u6cd5\u4f5c\u7528\u57df\u548c\u52a8\u6001\u4f5c\u7528\u57df\u300b<\/a><\/p>\n<p dir=\"auto\"><a href=\"https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/4\" data-hovercard-type=\"issue\" data-hovercard-url=\"\/mqyqingfeng\/Blog\/issues\/4\/hovercard\">\u300aJavaScript\u6df1\u5165\u4e4b\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u300b<\/a><\/p>\n<p dir=\"auto\"><a href=\"https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/5\" data-hovercard-type=\"issue\" data-hovercard-url=\"\/mqyqingfeng\/Blog\/issues\/5\/hovercard\">\u300aJavaScript\u6df1\u5165\u4e4b\u53d8\u91cf\u5bf9\u8c61\u300b<\/a><\/p>\n<h2 dir=\"auto\">\u6df1\u5165\u7cfb\u5217<\/h2>\n<p dir=\"auto\">JavaScript\u6df1\u5165\u7cfb\u5217\u76ee\u5f55\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/mqyqingfeng\/Blog\">https:\/\/github.com\/mqyqingfeng\/Blog<\/a>\u3002<\/p>\n<p dir=\"auto\">JavaScript\u6df1\u5165\u7cfb\u5217\u9884\u8ba1\u5199\u5341\u4e94\u7bc7\u5de6\u53f3\uff0c\u65e8\u5728\u5e2e\u5927\u5bb6\u634b\u987aJavaScript\u5e95\u5c42\u77e5\u8bc6\uff0c\u91cd\u70b9\u8bb2\u89e3\u5982\u539f\u578b\u3001\u4f5c\u7528\u57df\u3001\u6267\u884c\u4e0a\u4e0b\u6587\u3001\u53d8\u91cf\u5bf9\u8c61\u3001this\u3001\u95ed\u5305\u3001\u6309\u503c\u4f20\u9012\u3001call\u3001apply\u3001bind\u3001new\u3001\u7ee7\u627f\u7b49\u96be\u70b9\u6982\u5ff5\u3002<\/p>\n<p dir=\"auto\">\u5982\u679c\u6709\u9519\u8bef\u6216\u8005\u4e0d\u4e25\u8c28\u7684\u5730\u65b9\uff0c\u8bf7\u52a1\u5fc5\u7ed9\u4e88\u6307\u6b63\uff0c\u5341\u5206\u611f\u8c22\u3002\u5982\u679c\u559c\u6b22\u6216\u8005\u6709\u6240\u542f\u53d1\uff0c\u6b22\u8fcestar\uff0c\u5bf9\u4f5c\u8005\u4e5f\u662f\u4e00\u79cd\u9f13\u52b1\u3002<\/p>\n<\/td>\n<p>\u6587\u7ae0\u8f6c\u8f7d\u81ea<a href='https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/6'>https:\/\/github.com\/mqyqingfeng\/Blog\/issues\/6<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u5728\u300aJavaScript\u6df1\u5165\u4e4b\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u300b\u4e2d\u8bb2\u5230\uff0c\u5f53JavaScript\u4ee3\u7801\u6267\u884c\u4e00\u6bb5\u53ef\u6267\u884c\u4ee3\u7801(executable code)\u65f6\uff0c\u4f1a\u521b\u5efa\u5bf9\u5e94\u7684\u6267\u884c\u4e0a\u4e0b&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/www.lccc.top\/?p=1388\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1388","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1388"}],"collection":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1388"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1388\/revisions"}],"predecessor-version":[{"id":1493,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1388\/revisions\/1493"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1388"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1388"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1388"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}