{"id":1914,"date":"2024-11-10T15:52:45","date_gmt":"2024-11-10T07:52:45","guid":{"rendered":"https:\/\/fwq.ai\/blog\/1914\/"},"modified":"2024-11-10T15:52:45","modified_gmt":"2024-11-10T07:52:45","slug":"%e6%b5%8f%e8%a7%88%e5%99%a8%e4%b8%8e%e7%8b%ac%e7%ab%8b-js-%e6%96%87%e4%bb%b6%e8%bf%90%e8%a1%8c%e5%90%8c%e4%b8%80%e4%bb%a3%e7%a0%81%ef%bc%8c%e8%be%93%e5%87%ba%e4%b8%ba%e4%bd%95%e4%b8%8d%e5%90%8c","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/1914\/","title":{"rendered":"\u6d4f\u89c8\u5668\u4e0e\u72ec\u7acb JS \u6587\u4ef6\u8fd0\u884c\u540c\u4e00\u4ee3\u7801\uff0c\u8f93\u51fa\u4e3a\u4f55\u4e0d\u540c\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173061469570945.jpg\" class=\"aligncenter\" title=\"\u6d4f\u89c8\u5668\u4e0e\u72ec\u7acb JS \u6587\u4ef6\u8fd0\u884c\u540c\u4e00\u4ee3\u7801\uff0c\u8f93\u51fa\u4e3a\u4f55\u4e0d\u540c\uff1f\u63d2\u56fe\" alt=\"\u6d4f\u89c8\u5668\u4e0e\u72ec\u7acb JS \u6587\u4ef6\u8fd0\u884c\u540c\u4e00\u4ee3\u7801\uff0c\u8f93\u51fa\u4e3a\u4f55\u4e0d\u540c\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u4e00\u6bb5\u4ee3\u7801\u6267\u884c\u65f6\u8f93\u51fa\u4e0d\u540c\uff1a\u6d4f\u89c8\u5668\u4e0e\u72ec\u7acbjs\u6587\u4ef6\u5dee\u5f02\u89e3\u6790<\/strong><\/p>\n<p>\u5728\u7f16\u7a0b\u4e2d\uff0c\u76f8\u540c\u7684\u4ee3\u7801\u5728\u4e0d\u540c\u7684\u6267\u884c\u73af\u5883\u4e0b\u53ef\u80fd\u4f1a\u4ea7\u751f\u4e0d\u540c\u7684\u7ed3\u679c\uff0c\u4ee5\u4e0b\u4ee3\u7801\u5c31\u662f\u4e00\u4e2a\u7ecf\u5178\u6848\u4f8b\uff1a<\/p>\n<pre>function foo() {\n    console.log(this.a);\n}\n\nvar a = 2;\nfoo();<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u6d4f\u89c8\u5668\u8fd0\u884c<\/strong><\/p>\n<p>\u5728\u8fd9\u4e2a\u73af\u5883\u4e0b\uff0c\u8fd9\u6bb5\u4ee3\u7801\u5c06\u4f1a\u8f93\u51fa\uff1a<\/p>\n<pre>2<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u662f\u56e0\u4e3a\u5728\u6d4f\u89c8\u5668\u7684 javascript \u6b63\u5e38\u6a21\u5f0f\u4e2d\uff0cthis\u5173\u952e\u5b57\u9ed8\u8ba4\u7ed1\u5b9a\u5230\u5168\u5c40\u5bf9\u8c61\uff0c\u800c\u5168\u5c40\u5bf9\u8c61\u4e2d\u6709\u53d8\u91cf a\uff0c\u503c\u4e3a 2\u3002<\/p>\n<p><strong>\u72ec\u7acbjs\u6587\u4ef6\u8fd0\u884c<\/strong><\/p>\n<p>\u4f46\u662f\uff0c\u5f53\u6211\u4eec\u628a\u8fd9\u6bb5\u4ee3\u7801\u4fdd\u5b58\u5728\u4e00\u4e2a\u72ec\u7acb\u7684 js \u6587\u4ef6\u4e2d\uff0c\u7136\u540e\u4f7f\u7528 node.js \u547d\u4ee4\u6267\u884c\u65f6\uff0c\u8f93\u51fa\u7ed3\u679c\u5374\u662f\uff1a<\/p>\n<pre>undefined<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u662f\u56e0\u4e3a node.js \u9ed8\u8ba4\u4f1a\u542f\u7528\u4e25\u683c\u6a21\u5f0f\uff08strict mode\uff09\u3002\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0cthis\u5173\u952e\u5b57\u4e0d\u518d\u9ed8\u8ba4\u7ed1\u5b9a\u5230\u5168\u5c40\u5bf9\u8c61\uff0c\u800c\u662f\u7ed1\u5b9a\u5230\u51fd\u6570\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u3002\u800c\u8fd9\u4e2a\u51fd\u6570\u6ca1\u6709\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u56e0\u6b64\u8f93\u51fa\u4e3a undefined\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6cd5<\/strong><\/p>\n<p>\u4e3a\u4e86\u4f7f\u8fd9\u6bb5\u4ee3\u7801\u5728 node.js \u4e0b\u4e5f\u80fd\u8f93\u51fa 2\uff0c\u6211\u4eec\u53ef\u4ee5\u624b\u52a8\u5728\u51fd\u6570\u4e2d\u6307\u5b9a this \u7684\u7ed1\u5b9a\u5bf9\u8c61\uff1a<\/p>\n<pre>function foo() {\n    console.log(this.a);\n}\n\nvar a = 2;\nfoo.call({ a: a });<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u6837\uff0c\u6211\u4eec\u5c31\u660e\u786e\u6307\u5b9a\u4e86 this \u7ed1\u5b9a\u5230 { a: a } \u8fd9\u4e2a\u5bf9\u8c61\uff0c\u4ece\u800c\u4fdd\u8bc1\u8f93\u51fa\u4e0e\u6d4f\u89c8\u5668\u73af\u5883\u4e00\u81f4\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u6d4f\u89c8\u5668\u4e0e\u72ec\u7acb JS \u6587\u4ef6\u8fd0\u884c\u540c\u4e00\u4ee3\u7801\uff0c\u8f93\u51fa\u4e3a\u4f55\u4e0d\u540c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u6bb5\u4ee3\u7801\u6267\u884c\u65f6\u8f93\u51fa\u4e0d\u540c\uff1a\u6d4f\u89c8\u5668\u4e0e\u72ec\u7acbjs\u6587\u4ef6\u5dee\u5f02\u89e3\u6790 \u5728\u7f16\u7a0b\u4e2d\uff0c\u76f8\u540c\u7684\u4ee3\u7801\u5728\u4e0d\u540c\u7684\u6267\u884c\u73af\u5883\u4e0b\u53ef\u80fd\u4f1a\u4ea7\u751f\u4e0d\u540c\u7684\u7ed3\u679c\uff0c\u4ee5\u4e0b\u4ee3\u7801\u5c31\u662f\u4e00\u4e2a\u7ecf\u5178\u6848\u4f8b\uff1a function foo() { console.log(this.a); 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