{"id":2701,"date":"2024-11-10T09:59:18","date_gmt":"2024-11-10T01:59:18","guid":{"rendered":"https:\/\/fwq.ai\/blog\/2701\/"},"modified":"2024-11-10T09:59:18","modified_gmt":"2024-11-10T01:59:18","slug":"javascript-%e4%b8%ad-this-%e6%8c%87%e5%90%91%e7%9a%84%e8%b0%9c%e5%9b%a2%ef%bc%9a%e8%b0%83%e7%94%a8%e4%b8%8e%e8%b5%8b%e5%80%bc%e7%9a%84%e5%8c%ba%e5%88%ab%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/2701\/","title":{"rendered":"JavaScript \u4e2d this \u6307\u5411\u7684\u8c1c\u56e2\uff1a\u8c03\u7528\u4e0e\u8d4b\u503c\u7684\u533a\u522b\uff1f"},"content":{"rendered":"

\"JavaScript<\/p>\n

this\u6307\u5411\u7684\u7591\u8651\u4e0e\u89e3\u7b54<\/strong><\/p>\n

\u5bf9\u4e8ethis\u6307\u5411\u7684\u95ee\u9898\uff0c\u672c\u6587\u5c06\u56f4\u7ed5\u4e24\u4e2a\u4ee3\u7801\u6bb5\u5c55\u5f00\u8ba8\u8bba\uff1a<\/p>\n

function foo() {\n  console.log(this)\n}\n\nvar obj = {\n  a: 2,\n  foo: foo\n}\nobj.foo()<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
var obj = {\n  a: 2,\n  foo: console.log(this)\n}\nobj.foo()<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u95ee\u9898\uff1a<\/strong><\/p>\n
    \n
  • \u7b2c\u4e00\u4e2a\u4ee3\u7801\u6bb5\u548c\u7b2c\u4e8c\u4e2a\u4ee3\u7801\u6bb5\u662f\u5426\u7b49\u4ef7\uff1f\u5982\u679c\u5426\uff0c\u8bf7\u89e3\u91ca\u539f\u56e0\u3002<\/li>\n
  • \u8fd9\u4e24\u4e2a\u4ee3\u7801\u6bb5\u4e2d\uff0cthis\u6307\u5411\u4e86\u4ec0\u4e48\uff1f<\/li>\n<\/ul>\n
    \u89e3\u7b54\uff1a<\/strong><\/p>\n
    \u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n
      \n
    • \n
      \u7b2c\u4e00\u4e2a\u95ee\u9898\uff1a<\/strong>\u4e24\u4e2a\u4ee3\u7801\u6bb5\u4e0d\u7b49\u4ef7\u3002\u867d\u7136\u770b\u8d77\u6765\u76f8\u4f3c\uff0c\u4f46\u5b83\u4eec\u5728\u6267\u884c\u65f6\u8868\u73b0\u4e0d\u540c\u3002<\/p>\n
        \n
      • \u7b2c\u4e00\u4e2a\u4ee3\u7801\u6bb5\u4e2d\uff0cfoo\u65b9\u6cd5\u6ca1\u6709\u7acb\u5373\u6267\u884c\u3002obj.foo()\u8bed\u53e5\u8c03\u7528\u8be5\u65b9\u6cd5\u65f6\uff0cthis\u6307\u5411obj\u5bf9\u8c61\u3002<\/li>\n
      • \u7b2c\u4e8c\u4e2a\u4ee3\u7801\u6bb5\u4e2d\uff0cfoo\u76f4\u63a5\u88ab\u8d4b\u503c\u7ed9\u4e86obj.foo\u5c5e\u6027\u3002\u8fd9\u5b9e\u9645\u4e0a\u5c06console.log(this)\u7684\u6267\u884c\u7ed3\u679c\uff08typeof this\u5f97\u5230\u7684window\u5bf9\u8c61\uff09\u8d4b\u503c\u7ed9\u4e86foo\u5c5e\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n
      • \n
        \u7b2c\u4e8c\u4e2a\u95ee\u9898\uff1a<\/strong><\/p>\n
          \n
        •  \u7b2c\u4e00\u4e2a\u4ee3\u7801\u6bb5\uff1a<\/strong>this\u6307\u5411obj\u5bf9\u8c61\uff0c\u56e0\u4e3aobj.foo()\u8c03\u7528foo\u65b9\u6cd5\u65f6\uff0cfoo\u51fd\u6570\u4e2d\u7684this\u6307\u5411\u8c03\u7528\u8005obj\u3002<\/li>\n
        •  \u7b2c\u4e8c\u4e2a\u4ee3\u7801\u6bb5\uff1a<\/strong>this\u6307\u5411window\u5bf9\u8c61\uff0c\u56e0\u4e3aconsole.log(this)\u7684\u6267\u884c\u7ed3\u679c\u662fwindow\u5bf9\u8c61\uff0c\u5b83\u88ab\u8d4b\u503c\u7ed9\u4e86foo\u5c5e\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
          \u4ee5\u4e0a\u5c31\u662fJavaScript \u4e2d this \u6307\u5411\u7684\u8c1c\u56e2\uff1a\u8c03\u7528\u4e0e\u8d4b\u503c\u7684\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":"
          this\u6307\u5411\u7684\u7591\u8651\u4e0e\u89e3\u7b54 \u5bf9\u4e8ethis\u6307\u5411\u7684\u95ee\u9898\uff0c\u672c\u6587\u5c06\u56f4\u7ed5\u4e24\u4e2a\u4ee3\u7801\u6bb5\u5c55\u5f00\u8ba8\u8bba\uff1a function foo() { console.log(this) } var obj = { a: 2, foo: foo } obj.foo() \u767b\u5f55\u540e\u590d\u5236 var obj = { a: 2, foo: console.log(this) } obj.foo() \u767b\u5f55\u540e\u590d\u5236 \u95ee\u9898\uff1a \u7b2c\u4e00\u4e2a\u4ee3\u7801\u6bb5\u548c\u7b2c\u4e8c\u4e2a\u4ee3\u7801\u6bb5\u662f\u5426\u7b49\u4ef7\uff1f\u5982\u679c\u5426\uff0c\u8bf7\u89e3\u91ca\u539f\u56e0\u3002 \u8fd9\u4e24\u4e2a\u4ee3\u7801\u6bb5\u4e2d\uff0cthis\u6307\u5411\u4e86\u4ec0\u4e48\uff1f \u89e3\u7b54\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u7b2c\u4e00\u4e2a\u95ee\u9898\uff1a\u4e24\u4e2a\u4ee3\u7801\u6bb5\u4e0d\u7b49\u4ef7\u3002\u867d\u7136\u770b\u8d77\u6765\u76f8\u4f3c\uff0c\u4f46\u5b83\u4eec\u5728\u6267\u884c\u65f6\u8868\u73b0\u4e0d\u540c\u3002 \u7b2c\u4e00\u4e2a\u4ee3\u7801\u6bb5\u4e2d\uff0cfoo\u65b9\u6cd5\u6ca1\u6709\u7acb\u5373\u6267\u884c\u3002obj.foo()\u8bed\u53e5\u8c03\u7528\u8be5\u65b9\u6cd5\u65f6\uff0cthis\u6307\u5411obj\u5bf9\u8c61\u3002 \u7b2c\u4e8c\u4e2a\u4ee3\u7801\u6bb5\u4e2d\uff0cfoo\u76f4\u63a5\u88ab\u8d4b\u503c\u7ed9\u4e86obj.foo\u5c5e\u6027\u3002\u8fd9\u5b9e\u9645\u4e0a\u5c06console.log(this)\u7684\u6267\u884c\u7ed3\u679c\uff08typeof this\u5f97\u5230\u7684window\u5bf9\u8c61\uff09\u8d4b\u503c\u7ed9\u4e86foo\u5c5e\u6027\u3002 \u7b2c\u4e8c\u4e2a\u95ee\u9898\uff1a \u7b2c\u4e00\u4e2a\u4ee3\u7801\u6bb5\uff1athis\u6307\u5411obj\u5bf9\u8c61\uff0c\u56e0\u4e3aobj.foo()\u8c03\u7528foo\u65b9\u6cd5\u65f6\uff0cfoo\u51fd\u6570\u4e2d\u7684this\u6307\u5411\u8c03\u7528\u8005obj\u3002 \u7b2c\u4e8c\u4e2a\u4ee3\u7801\u6bb5\uff1athis\u6307\u5411window\u5bf9\u8c61\uff0c\u56e0\u4e3aconsole.log(this)\u7684\u6267\u884c\u7ed3\u679c\u662fwindow\u5bf9\u8c61\uff0c\u5b83\u88ab\u8d4b\u503c\u7ed9\u4e86foo\u5c5e\u6027\u3002 \u4ee5\u4e0a\u5c31\u662fJavaScript \u4e2d this \u6307\u5411\u7684\u8c1c\u56e2\uff1a\u8c03\u7528\u4e0e\u8d4b\u503c\u7684\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},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-2701","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2701","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=2701"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2701\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=2701"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=2701"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=2701"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}