{"id":2660,"date":"2024-11-10T16:40:54","date_gmt":"2024-11-10T08:40:54","guid":{"rendered":"https:\/\/fwq.ai\/blog\/2660\/"},"modified":"2024-11-10T16:40:54","modified_gmt":"2024-11-10T08:40:54","slug":"js-%e4%b8%ad-this-%e6%8c%87%e5%90%91%e7%9a%84%e7%96%91%e6%83%91%e8%a7%a3%e6%9e%90%ef%bc%9aobj-foo-%e5%92%8c-foo-%e4%b8%ba%e4%bb%80%e4%b9%88%e6%8c%87%e5%90%91-window-%e5%af%b9%e8%b1%a1%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/2660\/","title":{"rendered":"JS \u4e2d this \u6307\u5411\u7684\u7591\u60d1\u89e3\u6790\uff1aobj.foo() \u548c foo() \u4e3a\u4ec0\u4e48\u6307\u5411 window \u5bf9\u8c61\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173085435526743.jpg\" class=\"aligncenter\" title=\"JS \u4e2d this \u6307\u5411\u7684\u7591\u60d1\u89e3\u6790\uff1aobj.foo() \u548c foo() \u4e3a\u4ec0\u4e48\u6307\u5411 window \u5bf9\u8c61\uff1f\u63d2\u56fe\" alt=\"JS \u4e2d this \u6307\u5411\u7684\u7591\u60d1\u89e3\u6790\uff1aobj.foo() \u548c foo() \u4e3a\u4ec0\u4e48\u6307\u5411 window \u5bf9\u8c61\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>js\u4e2d this \u6307\u5411\u7684\u7591\u60d1\u89e3\u6790<\/strong><\/p>\n<p>\u5bf9\u4e8e this \u6307\u5411\u7684\u95ee\u9898\uff0c\u6709\u5f00\u53d1\u8005\u63d0\u51fa\u7591\u60d1\uff1a<\/p>\n<pre>function foo() {\n    console.log(this);\n}\n\nvar obj = {\n    a: 2,\n    foo: foo\n};\nobj.foo();<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u7591\u95ee 1\uff1a<\/strong><br \/> obj.foo() \u7b49\u4ef7\u4e8e foo()\uff1f<\/p>\n<p><strong>\u7591\u95ee 2\uff1a<\/strong><br \/>\u4e3a\u4ec0\u4e48 obj.foo() \u548c foo: console.log(this) \u90fd\u6307\u5411 window \u5bf9\u8c61\uff1f<\/p>\n<p><strong>\u89e3\u7b54\uff1a<\/strong><\/p>\n<p><strong>\u89e3\u7b54 1\uff1a<\/strong><br \/>\u4e0d\u7b49\u4ef7\u3002\u51fd\u6570\u540d\u540e\u9762\u52a0\u62ec\u53f7\u8868\u793a\u7acb\u5373\u6267\u884c\uff0c\u800c obj.foo() \u53ea\u662f\u5c06 foo() \u8d4b\u503c\u7ed9 obj \u7684 foo \u5c5e\u6027\u3002<\/p>\n<p><strong>\u89e3\u7b54 2\uff1a<\/strong><br \/>obj.foo() \u5b9e\u9645\u6267\u884c\u7684\u662f obj \u4e2d\u7684 foo \u65b9\u6cd5\uff0c\u6b64\u65f6 this \u6307\u5411 obj\u3002\u800c foo: console.log(this) \u5c06 console.log(this) \u7684\u503c\u76f4\u63a5\u8d4b\u503c\u7ed9 obj.foo\uff0c\u4e0e this \u6307\u5411\u65e0\u5173\u3002<\/p>\n<p><strong>this \u6307\u5411\u89c4\u5219\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e00\u822c\u6765\u8bf4\uff0cthis \u6307\u5411\u8c03\u7528\u5b83\u7684\u5bf9\u8c61\u3002<\/li>\n<li>\u5982\u679c\u51fd\u6570\u76f4\u63a5\u88ab\u8c03\u7528\uff0cthis \u6307\u5411 window \u5bf9\u8c61\uff08\u82e5\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c\u6307\u5411 undefined\uff09\u3002<\/li>\n<li>\u5982\u679c\u51fd\u6570\u4f5c\u4e3a\u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\uff0cthis \u6307\u5411\u8be5\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fJS \u4e2d this \u6307\u5411\u7684\u7591\u60d1\u89e3\u6790\uff1aobj.foo() \u548c foo() \u4e3a\u4ec0\u4e48\u6307\u5411 window \u5bf9\u8c61\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>js\u4e2d this \u6307\u5411\u7684\u7591\u60d1\u89e3\u6790 \u5bf9\u4e8e this \u6307\u5411\u7684\u95ee\u9898\uff0c\u6709\u5f00\u53d1\u8005\u63d0\u51fa\u7591\u60d1\uff1a function foo() { console.log(this); } var obj = { a: 2, foo: foo }; obj.foo(); \u767b\u5f55\u540e\u590d\u5236 \u7591\u95ee 1\uff1a obj.foo() \u7b49\u4ef7\u4e8e foo()\uff1f \u7591\u95ee 2\uff1a\u4e3a\u4ec0\u4e48 obj.foo() \u548c foo: console.log(this) \u90fd\u6307\u5411 window \u5bf9\u8c61\uff1f \u89e3\u7b54\uff1a \u89e3\u7b54 1\uff1a\u4e0d\u7b49\u4ef7\u3002\u51fd\u6570\u540d\u540e\u9762\u52a0\u62ec\u53f7\u8868\u793a\u7acb\u5373\u6267\u884c\uff0c\u800c obj.foo() \u53ea\u662f\u5c06 foo() \u8d4b\u503c\u7ed9 obj \u7684 foo \u5c5e\u6027\u3002 \u89e3\u7b54 2\uff1aobj.foo() \u5b9e\u9645\u6267\u884c\u7684\u662f obj \u4e2d\u7684 foo \u65b9\u6cd5\uff0c\u6b64\u65f6 this [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-2660","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2660","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=2660"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2660\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=2660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=2660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=2660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}