{"id":77,"date":"2024-05-24T14:18:33","date_gmt":"2024-05-24T14:18:33","guid":{"rendered":"http:\/\/icpnet.cn\/?p=77"},"modified":"2024-05-24T14:18:33","modified_gmt":"2024-05-24T14:18:33","slug":"js%e4%b8%adcallapplybind%e6%96%b9%e6%b3%95%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"http:\/\/icpnet.cn\/?p=77","title":{"rendered":"JS\u4e2dcall,apply,bind\u65b9\u6cd5\u5b9e\u73b0"},"content":{"rendered":"\n<p>js\u4e2d\u6539\u53d8this\u6307\u5411\u4e00\u822c\u6709\u4e09\u79cd\u65b9\u5f0f<\/p>\n\n\n\n<ul>\n<li>\u9690\u5f0f\u8f6c\u5316<\/li>\n\n\n\n<li>\u663e\u793a\u8f6c\u5316<\/li>\n\n\n\n<li>\u901a\u8fc7new\u5173\u952e\u5b57<\/li>\n<\/ul>\n\n\n\n<p>\u663e\u793a\u8f6c\u5316\u4e3b\u8981\u662f\u901a\u8fc7call,apply,bind\u65b9\u5f0f\u6765\u5b9e\u73b0\u3002\u4e0b\u9762\u4ecb\u7ecd\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u5b9e\u73b0\u7684\u57fa\u672c\u539f\u7406\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Call\u5b9e\u73b0<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>Function.protorype.myCall = function(context) {\n  if(typeof context !== 'function') {\n     throw new Error('not function');\n  }\n  const args = &#91;...arguments].slice(1);\n  context = context || window;\n  context.fn = this;\n  const result = context.fn(...args);\n  delete context.fn;\n  return result;\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Apply\u5b9e\u73b0<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>Function.protorype.myApply = function(context) {\n  if(typeof context !== 'function') {\n     throw new Error('not function');\n  }\n  const args = arguments&#91;1]\n  const fnSymbol = Symbol()\n  context = context || window;\n  context&#91;fnSymbol] = this;\n  let result = null;\n  if(args) {\n    result = context&#91;fnSymbol](...args);\n  } else {\n    result = context&#91;fnSymbol]();\n  }\n  delete context&#91;fnSymbol];\n  return result;\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Bind\u5b9e\u73b0<\/h4>\n\n\n\n<p>bind\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Function.prototype.myBind = function (context) {\r\n  \/\/ \u5224\u65ad\u8c03\u7528\u5bf9\u8c61\u662f\u5426\u4e3a\u51fd\u6570\r\n  if (typeof this !== \"function\") {\r\n    throw new Error(\"Type error\");\r\n  }\r\n  \/\/ \u83b7\u53d6\u53c2\u6570\r\n  const args = &#91;...arguments].slice(1),\r\n  const fn = this;\r\n  return function Fn() {\r\n    return fn.apply(\r\n      this instanceof Fn ? this : context,\r\n      \/\/ \u5f53\u524d\u7684\u8fd9\u4e2a arguments \u662f\u6307 Fn \u7684\u53c2\u6570\r\n      args.concat(...arguments)\r\n    );\r\n  };\r\n};\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>js\u4e2d\u6539\u53d8this\u6307\u5411\u4e00\u822c\u6709\u4e09\u79cd\u65b9\u5f0f \u663e\u793a\u8f6c\u5316\u4e3b\u8981\u662f\u901a\u8fc7call,apply,bind\u65b9\u5f0f\u6765\u5b9e\u73b0\u3002\u4e0b\u9762\u4ecb\u7ecd\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u5b9e\u73b0\u7684\u57fa\u672c\u539f\u7406\u3002 Call\u5b9e\u73b0 Apply\u5b9e\u73b0 Bind\u5b9e\u73b0 bind\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[27,28,26],"_links":{"self":[{"href":"http:\/\/icpnet.cn\/index.php?rest_route=\/wp\/v2\/posts\/77"}],"collection":[{"href":"http:\/\/icpnet.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/icpnet.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/icpnet.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/icpnet.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=77"}],"version-history":[{"count":1,"href":"http:\/\/icpnet.cn\/index.php?rest_route=\/wp\/v2\/posts\/77\/revisions"}],"predecessor-version":[{"id":78,"href":"http:\/\/icpnet.cn\/index.php?rest_route=\/wp\/v2\/posts\/77\/revisions\/78"}],"wp:attachment":[{"href":"http:\/\/icpnet.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=77"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/icpnet.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=77"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/icpnet.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=77"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}