{"id":17446,"date":"2025-05-27T10:29:04","date_gmt":"2025-05-27T02:29:04","guid":{"rendered":"https:\/\/92it.top\/?p=17446"},"modified":"2025-05-27T10:45:54","modified_gmt":"2025-05-27T02:45:54","slug":"javascript%e4%b8%ad%e7%9a%84this%e6%99%ae%e9%80%9a%e5%87%bd%e6%95%b0%e3%80%81%e7%ae%ad%e5%a4%b4%e5%87%bd%e6%95%b0%e3%80%81-%e5%87%bd%e6%95%b0%e8%bf%90%e7%94%a8","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=17446","title":{"rendered":"JavaScript\u4e2d\u7684this(\u666e\u901a\u51fd\u6570\u3001\u7bad\u5934\u51fd\u6570\u3001\u00a0\u51fd\u6570\u8fd0\u7528)"},"content":{"rendered":"\n<p>\u8f6c\u8f7d\uff1a<a href=\"https:\/\/www.jb51.net\/javascript\/3394889at.htm\">https:\/\/www.jb51.net\/javascript\/3394889at.htm<\/a><\/p>\n\n\n\n<p><strong>\u524d\u8a00<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>this\u673a\u5236\uff0c\u6211\u731c\u5927\u90e8\u5206\u7684JavaScript\u4f7f\u7528\u8005\u90fd\u5bf9\u5b83\u5934\u75bc\u4e0d\u5df2\uff0c\u5b83\u786e\u5b9e\u5728\u5f88\u591a\u65f6\u5019\u80fd\u7ed9\u6211\u4eec\u5199\u4ee3\u7801\u5e26\u6765\u4fbf\u5229\uff0c\u4f46\u6709\u4e9b\u65f6\u5019\u5374\u8ba9\u4eba\u96be\u4ee5\u638c\u63a7\uff0c\u65f6\u5e38\u4f1a\u51fa\u73b0\u6307\u54ea\u54ea\u4e0d\u7075\u7684\u573a\u666f\u3002\u4f5c\u4e3a\u53d7\u5bb3\u8005\u4e4b\u4e00\uff0c\u51fa\u4e8e\u597d\u5947\u548c\u5bf9\u4ee3\u7801\u7684\u63a7\u5236\u6b32\uff0c\u6211\u4e0d\u5f97\u4e0d\u53d1\u6325\u4e00\u4e0b\u5f3a\u8feb\u75c7\u7684\u529b\u91cf\uff0c\u9a71\u4f7f\u6211\u5f04\u61c2\u5b83\uff0c\u73b0\u5206\u4eab\u4e00\u4e0b\u6211\u5bf9this\u5173\u952e\u5b57\u7684\u7406\u89e3\u3002<\/p>\n\n\n\n<p>this\u5bf9\u8c61\uff1a\u89e3\u6790\u5668\u5728\u6bcf\u6b21\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u90fd\u4f1a\u5411\u51fd\u6570\u5185\u90e8\u8f6c\u9012\u4e00\u4e2a\u9690\u542b\u7684\u53c2\u6570\uff0c\u8fd9\u4e2a\u53c2\u6570\u5c31\u662fthis\uff0cthis\u6307\u5411\u7684\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u6211\u4eec\u79f0\u4e3a\u51fd\u6570\u6267\u884c\u7684\u4e0a\u4e0b\u6587\u5bf9\u8c61\uff0c\u6839\u636e\u51fd\u6570\u8c03\u7528\u65b9\u5f0f\u7684\u4e0d\u540c\uff0cthis\u4f1a\u6307\u5411\u4e0d\u540c\u7684\u5bf9\u8c61\u3002<strong>this\u662f\u5f53\u524d\u6267\u884c\u4e0a\u4e0b\u6587\u4e2d\u6240\u6307\u5411\u7684\u5bf9\u8c61\uff08\u5b9e\u9645\u4e0a\u5c31\u662f\u8fd9\u4e2a\u5bf9\u8c61\u7684\u6307\u9488\u6216\u5f15\u7528\uff09\uff0c\u5b83\u53d6\u51b3\u4e8e\u51fd\u6570\u662f\u5982\u4f55\u88ab\u8c03\u7528\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cthis\u662f\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u5c5e\u6027\u3002<\/strong><\/p>\n\n\n\n<p><strong>this\u5173\u952e\u5b57\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n\n\n\n<ul>\n<li><code>this<\/code>\u662f<code>javascript<\/code>\u4e2d\u6700\u590d\u6742\u7684\u673a\u5236\u4e4b\u4e00\uff0c<code>this<\/code>\u5173\u952e\u5b57\u5b58\u5728\u4e8e\u6211\u4eec\u58f0\u660e\u7684\u51fd\u6570\u4e2d\uff0c\u5b83\u662f\u6211\u4eec\u6240\u671f\u671b\u64cd\u4f5c\u5bf9\u8c61\u7684\u4ee3\u8868\u3002<\/li>\n\n\n\n<li>\u5f53\u4e00\u4e2a\u51fd\u6570\u88ab\u8c03\u7528\u65f6\uff0c\u4f1a\u5728\u7f16\u8bd1\u5668\u4e2d\u7559\u4e0b\u4e00\u6761\u8bb0\u5f55\uff0c\u8fd9\u4e2a\u8bb0\u5f55\u5305\u62ec\u4e86\u51fd\u6570\u7684\u8c03\u7528\u4f4d\u7f6e\u3001\u8c03\u7528\u65b9\u5f0f\u3001\u4f20\u9012\u7684\u53c2\u6570\u7b49\u4fe1\u606f\uff0cthis\u4e5f\u4f5c\u4e3a\u8bb0\u5f55\u4e2d\u7684\u4e00\u4e2a\u4fe1\u606f\u5c5e\u6027\u5728\u51fd\u6570\u6267\u884c\u7684\u65f6\u5019\u88ab\u4f7f\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u4e00\u3001\u5c06\u6839\u636e\u4e00\u4e0b\u51e0\u4e2a\u65b9\u9762\u4ecb\u7ecdthis\u7684\u6307\u5411\u95ee\u9898<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>1\u3001\u5168\u5c40\u73af\u5883\u4e2d\u7684this<\/strong><\/p>\n\n\n\n<p>\u5728\u5168\u5c40\u73af\u5883\u4e2d\uff08\u4e0d\u5728\u4efb\u4f55\u51fd\u6570\u6216\u5bf9\u8c61\u5185\u90e8\uff09\uff0cthis\u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff08\u5728\u6d4f\u89c8\u5668\u73af\u5883\u4e2d\u662f<strong>window<\/strong>\uff0c\u5728node.js\u4e2d\u662f<strong>global<\/strong>\uff09<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">console.log(this === window); \/\/ \u5728\u6d4f\u89c8\u5668\u4e2d\u8f93\u51fa true\n<\/pre>\n\n\n\n<p><strong>2\u3001\u51fd\u6570\u4e2d\u7684this<\/strong><\/p>\n\n\n\n<p>\u5f53\u4e00\u4e2a\u51fd\u6570\u88ab\u76f4\u63a5\u8c03\u7528\u65f6\uff0cthis\u5728\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\u6307\u5411<strong>\u5168\u5c40\u5bf9\u8c61<\/strong>\uff08window\uff09\uff0c\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\u6307\u5411<strong>undefined<\/strong><\/p>\n\n\n\n<p>JS\u4e25\u683c\u6a21\u5f0f\uff1aJavaScript\u5728\u8bed\u6cd5\u548c\u884c\u4e3a\u4e0a\u5b58\u5728\u4e00\u4e9b\u6a21\u7cca\u7684\u7279\u6027\uff0c\u53ef\u80fd\u5bfc\u81f4\u4e00\u4e9b\u4e0d\u6613\u5bdf\u89c9\u7684\u9519\u8bef\uff0c\u4e3a\u63d0\u9ad8\u4ee3\u7801\u7684\u8d28\u91cf\u548c\u53ef\u7ef4\u62a4\u6027\uff0cjs\u5f15\u5165\u4e86\u4e25\u683c\u6a21\u5f0f\uff0c\u901a\u8fc7\u542f\u7528\u4e00\u4e9b\u989d\u5916\u7684\u89c4\u5219\uff0c\u5f3a\u5236\u6267\u884c\u66f4\u4e25\u683c\u7684\u8bed\u6cd5\u548c\u884c\u4e3a\u3002\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\u4ee3\u7801\u4e2d\u7684\u6f5c\u5728\u95ee\u9898\u5c06\u88ab\u6355\u83b7\u5e76\u629b\u51fa\u9519\u8bef\uff0c\u6709\u52a9\u4e8e\u63d0\u524d\u53d1\u73b0\u548c\u4fee\u590d\u6f5c\u5728bug\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">function regularFunction() {\n  console.log(this);\n}\n \nregularFunction(); \/\/ \u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\u6307\u5411 window\uff0c\u4e25\u683c\u6a21\u5f0f\u4e0b\u4e3a undefined\n \n\/\/ \u6f14\u793a\u4e25\u683c\u6a21\u5f0f\u4e0b\u7684\u60c5\u51b5\n(function () {\n  \"use strict\";\n  regularFunction();\n})();<\/pre>\n\n\n\n<p><strong>3\u3001\u5bf9\u8c61\u65b9\u6cd5\u4e2d\u7684this<\/strong><\/p>\n\n\n\n<p>\u5f53\u51fd\u6570\u4f5c\u4e3a\u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\u65f6\uff0cthis\u6307\u5411\u8c03\u7528\u8be5\u65b9\u6cd5\u7684\u5bf9\u8c61<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var person = {\n  name: \"John\",\n  sayName: function () {\n    console.log(this.name);\n  }\n};\n \nperson.sayName(); \/\/ \u8f93\u51fa \"John\"\uff0c\u8fd9\u91cc\u7684 this \u6307\u5411 person \u5bf9\u8c61<\/pre>\n\n\n\n<p><strong>4\u3001\u6784\u9020\u51fd\u6570\u4e2d\u7684this<\/strong><\/p>\n\n\n\n<p>\u4f7f\u7528new\u5173\u952e\u5b57\uff08\u5b9e\u4f8b\u5316\uff09\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u8be5\u51fd\u6570\u88ab\u5f53\u4f5c\u6784\u9020\u51fd\u6570\uff08\u7c7b\uff09\uff0cthis\u4f1a\u6307\u5411\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u5b9e\u4f8b<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">function Person(name) {\n  this.name = name;\n  this.sayHello = function () {\n    console.log(\"Hello, I'm \" + this.name);\n  };\n}\n\nvar john = new Person(\"John\");\njohn.sayHello(); \/\/ \u8f93\u51fa \"Hello, I'm John\"\uff0c\u8fd9\u91cc this \u6307\u5411 john \u5b9e\u4f8b\n<\/pre>\n\n\n\n<p>\u6784\u9020\u51fd\u6570\u600e\u4e48\u6267\u884c\u521b\u5efa\u5bf9\u8c61\u7684\u8fc7\u7a0b\uff1a<\/p>\n\n\n\n<ul>\n<li>\u8c03\u7528\u4e00\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u4ed6\u4f1a\u7acb\u5373\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61<\/li>\n\n\n\n<li>\u5c06\u65b0\u5efa\u7684\u5bf9\u8c61\u8bbe\u7f6e\u4e3a\u51fd\u6570\u4e2d\u7684this\uff0c<strong>\u5728\u6784\u9020\u51fd\u6570\u4e2d\u53ef\u4ee5\u4f7f\u7528this\u6765\u5f15\u7528\u65b0\u5efa\u7684\u5bf9\u8c61<\/strong><\/li>\n\n\n\n<li>\u9010\u884c\u6267\u884c\u51fd\u6570\u4e2d\u7684\u4ee3\u7801<\/li>\n\n\n\n<li>\u5c06\u65b0\u5efa\u7684\u5bf9\u8c61\u4f5c\u4e3a\u8fd4\u56de\u503c\u8fd4\u56de<\/li>\n<\/ul>\n\n\n\n<p>\u5728\u6784\u9020\u51fd\u6570\u4e2d\uff0c\u521b\u5efa\u5bf9\u8c61\u548c\u8fd4\u56de\u5bf9\u8c61\u90fd\u7ed9\u6211\u4eec\u9690\u85cf\u4e86\uff0c\u4f7f\u7528\u540c\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u5bf9\u8c61\uff0c\u6211\u4eec\u79f0\u4e3a\u4e00\u7c7b\u5bf9\u8c61\uff0c\u4e5f\u5c06\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u79f0\u4e3a\u4e00\u4e2a\u7c7b\u3002\u6211\u4eec\u5c06\u901a\u8fc7\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u5bf9\u8c61\uff0c\u79f0\u4e3a\u662f\u8be5\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p><strong>5\u3001\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\u7684this<\/strong><\/p>\n\n\n\n<p>\u5728DOM\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\uff0cthis\u901a\u5e38\u6307\u5411\u89e6\u53d1\u4e8b\u4ef6\u7684\u5143\u7d20<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;button id=\"myButton\">Click me&lt;\/button>\n\n&lt;script>\n  var button = document.getElementById(\"myButton\");\n  button.onclick = function () {\n    console.log(this); \/\/ \u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u8fd9\u91cc\u7684 this \u6307\u5411\u6309\u94ae\u5143\u7d20\n    \t\t\t\t  \/\/\u6253\u5370 \uff1a&lt;button id=\"myButton\">Click me&lt;\/button>\n  };\n&lt;\/script>\n<\/pre>\n\n\n\n<p><strong>6\u3001\u7bad\u5934\u51fd\u6570\u4e2d\u7684this<\/strong><\/p>\n\n\n\n<p>\u7bad\u5934\u51fd\u6570\u6ca1\u6709\u81ea\u5df1\u7684this\uff0c\u5b83\u7684this\u7ee7\u627f\u81ea\u5916\u5c42\u4f5c\u7528\u57df\u7684this<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u666e\u901a\u51fd\u6570\nfunction outerFunction() {\n  this.name = \"Outer\";\n  var innerFunction = function () {\n    console.log(this.name);\n  };\n  innerFunction();\n}\n\n\/\/ \u7bad\u5934\u51fd\u6570\nfunction outerFunctionWithArrow() {\n  this.name = \"Outer with Arrow\";\n  var innerFunction = () => {\n    console.log(this.name);\n  };\n  innerFunction();\n}\n\nnew outerFunction(); \/\/ \u8f93\u51fa undefined\uff0c\u56e0\u4e3a innerFunction \u4e2d\u7684 this \u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff0c\u5168\u5c40\u5bf9\u8c61\u6ca1\u6709 name \u5c5e\u6027\nnew outerFunctionWithArrow(); \/\/ \u8f93\u51fa \"Outer with Arrow\"\uff0c\u7bad\u5934\u51fd\u6570\u7684 this \u7ee7\u627f\u81ea outerFunctionWithArrow \u7684 this\n<\/pre>\n\n\n\n<p><strong>\u4e8c\u3001\u6539\u53d8this\u6307\u5411\u7684\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u7531\u4e8e\u7bad\u5934\u51fd\u6570\u7684this\u6765\u81ea\u4e8e\u7ee7\u627f\uff0c\u7bad\u5934\u51fd\u6570\u65e0\u6cd5\u4f7f\u7528\u4ee5\u4e0b\u4e09\u79cd\u65b9\u6cd5\u6539\u53d8this\u6307\u5411<\/p>\n\n\n\n<p><strong>1\u3001call()\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<ul>\n<li><code>call<\/code>&nbsp;\u65b9\u6cd5\u662f\u9644\u52a0\u5728\u51fd\u6570\u8c03\u7528\u540e\u9762\u4f7f\u7528\uff0c\u53ef\u4ee5\u5ffd\u7565\u51fd\u6570\u672c\u8eab\u7684 this \u6307\u5411<\/li>\n\n\n\n<li>\u8bed\u6cd5\uff1a&nbsp;\u51fd\u6570\u540d.call(\u8981\u6539\u53d8\u7684 this \u6307\u5411\uff0c\u8981\u7ed9\u51fd\u6570\u4f20\u9012\u7684\u53c2\u65701\uff0c\u8981\u7ed9\u51fd\u6570\u4f20\u9012\u7684\u53c2\u65702\uff0c &#8230;)<\/li>\n\n\n\n<li>\u4f7f\u7528 call \u65b9\u6cd5\u7684\u65f6\u5019:<br>1\u3001\u4f1a\u7acb\u5373\u6267\u884c\u51fd\u6570<br>2\u3001\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u4f60\u8981\u6539\u53d8\u7684\u51fd\u6570\u5185\u90e8\u7684 this \u6307\u5411<br>3\u3001\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5f00\u59cb\uff0c\u4f9d\u6b21\u662f\u5411\u51fd\u6570\u4f20\u9012\u53c2\u6570<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var obj = { name: 'Jack' }\nfunction fn(a, b) {\n  console.log(this)\n  console.log(a)\n  console.log(b)\n}\nfn(1, 2)\nfn.call(obj, 1, 2)\n<\/pre>\n\n\n\n<ul>\n<li><code>fn(1,2)<\/code>&nbsp;\u7684\u65f6\u5019\uff0c\u51fd\u6570\u5185\u90e8\u7684 this \u6307\u5411 window\uff08\u51fd\u6570\u88ab\u76f4\u63a5\u8c03\u7528\uff09<\/li>\n\n\n\n<li><code>fn.call(obj, 1, 2)<\/code>&nbsp;\u7684\u65f6\u5019\uff0c\u51fd\u6570\u5185\u90e8\u7684 this \u5c31\u6307\u5411\u4e86 obj \u8fd9\u4e2a\u5bf9\u8c61<\/li>\n<\/ul>\n\n\n\n<p><strong>2\u3001apply()\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<ul>\n<li><code>apply<\/code>&nbsp;\u65b9\u6cd5\u662f\u9644\u52a0\u5728\u51fd\u6570\u8c03\u7528\u540e\u9762\u4f7f\u7528\uff0c\u53ef\u4ee5\u5ffd\u7565\u51fd\u6570\u672c\u8eab\u7684 this \u6307\u5411<\/li>\n\n\n\n<li>\u8bed\u6cd5\uff1a&nbsp;\u51fd\u6570\u540d.apply(\u8981\u6539\u53d8\u7684 this \u6307\u5411\uff0c[\u8981\u7ed9\u51fd\u6570\u4f20\u9012\u7684\u53c2\u65701\uff0c \u8981\u7ed9\u51fd\u6570\u4f20\u9012\u7684\u53c2\u65702\uff0c &#8230;])<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>apply<\/code> \u65b9\u6cd5\u7684\u65f6\u5019:<br>1\u3001\u4f1a\u7acb\u5373\u6267\u884c\u51fd\u6570<br>2\u3001\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u4f60\u8981\u6539\u53d8\u7684\u51fd\u6570\u5185\u90e8\u7684 this \u6307\u5411<br>3\u3001\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a&nbsp;<strong>\u6570\u7ec4<\/strong>\uff0c\u6570\u7ec4\u91cc\u9762\u7684\u6bcf\u4e00\u9879\u4f9d\u6b21\u662f\u5411\u51fd\u6570\u4f20\u9012\u7684\u53c2\u6570\uff08\u548ccall\u65b9\u6cd5\u7684\u4e3b\u8981\u533a\u522b\u70b9\uff09<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var obj = { name: 'Jack' }\nfunction fn(a, b) {\n  console.log(this)\n  console.log(a)\n  console.log(b)\n}\nfn(1, 2)\nfn.apply(obj, [1, 2])\n<\/pre>\n\n\n\n<ul>\n<li><code>fn(1,2)<\/code>&nbsp;\u7684\u65f6\u5019\uff0c\u51fd\u6570\u5185\u90e8\u7684 this \u6307\u5411 window\uff08\u51fd\u6570\u88ab\u76f4\u63a5\u8c03\u7528\uff09<\/li>\n\n\n\n<li><code>fn.call(obj, 1, 2)<\/code>&nbsp;\u7684\u65f6\u5019\uff0c\u51fd\u6570\u5185\u90e8\u7684 this \u5c31\u6307\u5411\u4e86 obj \u8fd9\u4e2a\u5bf9\u8c61<\/li>\n<\/ul>\n\n\n\n<p><strong>3\u3001bind()\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<ul>\n<li><code>bind<\/code>&nbsp;\u65b9\u6cd5\u662f\u9644\u52a0\u5728\u51fd\u6570\u8c03\u7528\u540e\u9762\u4f7f\u7528\uff0c\u53ef\u4ee5\u5ffd\u7565\u51fd\u6570\u672c\u8eab\u7684 this \u6307\u5411<\/li>\n\n\n\n<li>\u548c call \/ apply \u6709\u4e00\u4e9b\u4e0d\u4e00\u6837\uff0c\u5c31\u662f\u4e0d\u4f1a\u7acb\u5373\u6267\u884c\u51fd\u6570\uff0c\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u5df2\u7ecf\u6539\u53d8\u4e86 this \u6307\u5411\u7684\u51fd\u6570<\/li>\n\n\n\n<li>\u8bed\u6cd5\uff1a&nbsp;var newFn = \u51fd\u6570\u540d.bind(\u8981\u6539\u53d8\u7684 this \u6307\u5411);&nbsp;newFn(\u4f20\u9012\u53c2\u6570)<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var obj = { name: 'Jack' }\nfunction fn(a, b) {\n  console.log(this)\n  console.log(a)\n  console.log(b)\n}\nfn(1, 2)\nvar newFn = fn.bind(obj)\nnewFn(1, 2)\n<\/pre>\n\n\n\n<ul>\n<li>bind \u8c03\u7528\u7684\u65f6\u5019\uff0c\u4e0d\u4f1a\u6267\u884c fn \u8fd9\u4e2a\u51fd\u6570\uff0c\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u51fd\u6570<\/li>\n\n\n\n<li>\u8fd9\u4e2a\u65b0\u7684\u51fd\u6570\u5c31\u662f\u4e00\u4e2a\u6539\u53d8\u4e86 this \u6307\u5411\u4ee5\u540e\u7684 fn \u51fd\u6570<\/li>\n\n\n\n<li><code>fn(1, 2)<\/code>&nbsp;\u7684\u65f6\u5019 this \u6307\u5411 window<\/li>\n\n\n\n<li><code>newFn(1, 2)<\/code>&nbsp;\u7684\u65f6\u5019\u6267\u884c\u7684\u662f\u4e00\u4e2a\u548c fn \u4e00\u6478\u4e00\u6837\u7684\u51fd\u6570\uff0c\u53ea\u4e0d\u8fc7\u91cc\u9762\u7684 this \u6307\u5411\u6539\u6210\u4e86 obj<\/li>\n<\/ul>\n\n\n\n<p><strong>\u4e09\u3001\u56de\u8c03\u51fd\u6570\u4e2dthis\u6307\u5411<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>\u8fd9\u91cc\u6211\u4eec\u8865\u5145\u4e00\u4e0b\u5728\u56de\u8c03\u51fd\u6570\u8fd0\u7528\u4e2dthis\u6307\u5411\uff08\u4e5f\u662f\u5bb9\u6613\u6df7\u6dc6\u7684\u77e5\u8bc6\u70b9\uff09<\/strong><\/p>\n\n\n\n<p><strong>1\u3001\u5bf9\u8c61\u65b9\u6cd5\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570<\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u56de\u8c03\u51fd\u6570\u662f\u4e00\u4e2a\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u5e76\u4e14\u662f\u4ee5\u5bf9\u8c61\u65b9\u6cd5\u7684\u65b9\u5f0f\u4f20\u9012\u8fdb\u53bb\u7684\uff0c\u90a3\u4e48 this \u901a\u5e38\u4f1a\u6307\u5411\u8be5\u5bf9\u8c61\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var myObject = {\n  value: 10,\n  callbackFunction: function () {\n    console.log(this.value);\n  }\n};\n[1,2,3].forEach(() => {\n  myObject.callbackFunction()\n});        \/\/\u8f93\u51fa\u4e09\u4e2a10\n<\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cforEach \u662f\u6570\u7ec4\u7684\u65b9\u6cd5\uff0cmyObject.callbackFunction \u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u4f20\u9012\u7ed9 forEach\u3002\u5f53 forEach \u8c03\u7528\u8fd9\u4e2a\u56de\u8c03\u51fd\u6570\u65f6\uff0cthis \u4ecd\u7136\u6307\u5411 myObject\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u51fd\u6570\u672c\u8d28\u4e0a\u8fd8\u662f myObject \u7684\u4e00\u4e2a\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p><strong>2\u3001\u7bad\u5934\u51fd\u6570\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570<\/strong><\/p>\n\n\n\n<p>\u7bad\u5934\u51fd\u6570\u6ca1\u6709\u81ea\u5df1\u7684 this\uff0c\u5b83\u4f1a\u7ee7\u627f\u5916\u5c42\u4f5c\u7528\u57df\u7684 this\uff08\u4f9d\u636e\u8bcd\u6cd5\u4f5c\u7528\u57df\u89c4\u5219\uff09\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">function outerFunction() {\n  this.name = \"Outer\";\n  var array = [1, 2, 3];\n  array.forEach(() => {\n    console.log(this.name);  \/\/\u6253\u5370\u4e09\u6b21Outer\n  });\n}\nnew outerFunction();\n<\/pre>\n\n\n\n<p>\u6839\u636e\u4e0a\u9762\u4e24\u4e2a\u4f8b\u5b50\uff0c\u8fd9\u91cc\u6211\u4eec\u4ecb\u7ecd\u4e00\u4e0b<strong>\u666e\u901a\u51fd\u6570<\/strong>\u548c<strong>\u7bad\u5934\u51fd\u6570<\/strong>\u5728\u786e\u5b9athis\u6307\u5411\u65f6\u7684\u4e00\u4e9b\u533a\u522b\uff1a<\/p>\n\n\n\n<p>1\u3001\u666e\u901a\u51fd\u6570<\/p>\n\n\n\n<p>\u666e\u901a\u51fd\u6570\u5728\u51fd\u6570\u5b9a\u4e49\u65f6\u4f1a\u786e\u5b9a\u51fd\u6570\u7684\u4f5c\u7528\u57df\uff0c\u4f46\u4e0d\u4f1a\u660e\u786e\u51fd\u6570\u4e2dthis\u7684\u6307\u5411\u3002\u666e\u901a\u51fd\u6570\u4e2dthis\u7684\u6307\u5411\u662f\u5728\u51fd\u6570\u88ab\u8c03\u7528\u65f6\u88ab\u786e\u5b9a\uff08\u6307\u5411\u8c03\u7528\u8005\u6216\u8005\u5168\u5c40\u5bf9\u8c61\uff09<\/p>\n\n\n\n<p>2\u3001\u7bad\u5934\u51fd\u6570<\/p>\n\n\n\n<p>\u7bad\u5934\u51fd\u6570\u7531\u4e8e\u5176\u672c\u8eab\u4e0d\u4f1a\u751f\u6210this\uff0c\u5176this\u7ee7\u627f\u81ea\u5916\u5c42\u4f5c\u7528\u57df\u3002\u7bad\u5934\u51fd\u6570\u5728\u5b9a\u4e49\u65f6\u4e0d\u4ec5\u4f1a\u786e\u5b9a\u4f5c\u7528\u57df\uff0c\u800c\u4e14\u4f1a\u6355\u83b7\u5916\u5c42\u4f5c\u7528\u57df\u7684this\u4f5c\u4e3a\u81ea\u8eab\u7684this\uff0c\u7bad\u5934\u51fd\u6570\u7684this\u5728\u5b9a\u4e49\u65f6\u5c31\u5df2\u7ecf\u786e\u5b9a\uff0c\u5728\u5176\u540e\u7684\u51fd\u6570\u8c03\u7528\u65f6\uff0c\u65e0\u8bba\u8c03\u7528\u7bad\u5934\u51fd\u6570\u7684\u662f\u8c01\u5b83\u7684this\u6307\u5411\u90fd\u4e0d\u4f1a\u53d1\u751f\u6539\u53d8\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0a\u9762\u8fd9\u4e2a\u4f8b\u5b50\u4e3a\u4f8b\uff1a<\/p>\n\n\n\n<p>\u7bad\u5934\u51fd\u6570\u5b9a\u4e49\u5728 outerFunction \u8fd9\u4e2a\u51fd\u6570\u5185\u90e8\uff0c\u6ce8\u610f\u4e0d\u662f\u5b9a\u4e49\u5728 forEach \u65b9\u6cd5\u5185\u3002\u5177\u4f53\u53ef\u4ee5\u4e86\u89e3\u4e00\u4e0b\u51fd\u6570\u4f20\u53c2\u7684\u6b65\u9aa4\uff0c\u8fd9\u91cc\u7bad\u5934\u51fd\u6570\u662f\u5148\u5728 outerFunction \u8fd9\u4e2a\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\uff0c\u4e4b\u540e\u624d\u4f5c\u4e3a\u53c2\u6570\u4f20\u7ed9 forEach \u65b9\u6cd5\u3002\u7bad\u5934\u51fd\u6570\u7ee7\u627f\u4e86 outerFunction \u51fd\u6570\u7684this\uff0c\u5e76\u5728\u4e4b\u540e\u88ab forEach \u65b9\u6cd5\u8c03\u7528\u65f6\u4e0d\u4f1a\u53d1\u751f\u6539\u53d8\u3002<\/p>\n\n\n\n<p><strong>3\u3001\u56de\u8c03\u51fd\u6570\u6307\u5411\u5168\u5c40\u5bf9\u8c61\u7684\u5e38\u89c1\u60c5\u51b5<\/strong><\/p>\n\n\n\n<p>\u5f53\u666e\u901a\u51fd\u6570\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\uff0c\u5e76\u4e14\u8fd9\u4e2a\u666e\u901a\u51fd\u6570\u662f\u88ab\u4e00\u4e2a\u5168\u5c40\u51fd\u6570\uff08\u5982 setTimeout\u3001setInterval\uff09\u6216\u8005\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u72ec\u7acb\u8c03\u7528\u7684\u51fd\u6570\uff08\u6ca1\u6709\u901a\u8fc7\u5bf9\u8c61\u6765\u8c03\u7528\uff09\u8c03\u7528\u65f6\uff0c\u5728\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0cthis \u901a\u5e38\u4f1a\u6307\u5411\u5168\u5c40\u5bf9\u8c61\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/\u88ab\u4e00\u4e2a\u5168\u5c40\u51fd\u6570\u8c03\u7528\nsetTimeout(function () {\n  console.log(this); \n}, 1000);\n<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u72ec\u7acb\u8c03\u7528\n  function outer(){\n    inner()\n  }\n  function inner(){\n    console.log(this);\n  }\n  outer()\n<\/pre>\n\n\n\n<p><strong>\u56db\u3001\u603b\u7ed3\u4e0e\u5e38\u89c1\u9519\u8bef\u793a\u4f8b<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>this\u6307\u5411\uff1a<\/strong><\/p>\n\n\n\n<ul>\n<li>1\u3001\u666e\u901a\u51fd\u6570\uff1a\u8c01\u8c03\u7528\u51fd\u6570\uff0cthis\u5c31\u6307\u5411\u8c01\uff0c\u6ca1\u6709\u8c03\u7528\u8005\u5c31\u6307\u5411\u5168\u5c40\u5bf9\u8c61Window<\/li>\n\n\n\n<li>2\u3001\u7bad\u5934\u51fd\u6570\uff1a\u7bad\u5934\u51fd\u6570\u4e0d\u4f1a\u521b\u5efathis\uff0c\u5b83\u7684this\u7ee7\u627f\u81ea\u4e0a\u5c42\u4f5c\u7528\u57df\u4e2d\u7684this<\/li>\n<\/ul>\n\n\n\n<p><strong>1\u3001\u6848\u4f8b\u4e00<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/\u56de\u8c03\u51fd\u6570\u4e2d\u9519\u8bef\u4f7f\u7528this\nvar person = {\n  name: \"Eve\",\n  greetLater: function () {\n    setTimeout(function () {\n      console.log(this.name); \/\/ \u6b64\u5904\u7684function\u4e3a\u666e\u901a\u51fd\u6570\uff0c\u4f5c\u4e3asetTimeout\u7684\u53c2\u6570this\u6307\u5411\u5168\u5c40\u5bf9\u8c61\n    }, 1000);\n  }\n};\n\nperson.greetLater();\n<\/pre>\n\n\n\n<p>\u6b64\u5904\u7684function\u4e3a\u666e\u901a\u51fd\u6570\uff0c\u88ab\u4e00\u4e2a\u5168\u5c40\u51fd\u6570\u8c03\u7528\uff0c\u5176this\u6307\u5411\u5168\u5c40\u5bf9\u8c61 Window \u3002<\/p>\n\n\n\n<p>\u8981\u60f3\u8f93\u51fa Eve \uff0c\u5c06\u6b64\u5904\u7684\u666e\u901a\u51fd\u6570\u6539\u4e3a\u7bad\u5934\u51fd\u6570\u5373\u53ef\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var person = {\n  name: \"Eve\",\n  greetLater: function () {\n    setTimeout( ()=> {\n      console.log(this.name); \/\/ \u8f93\u51faEve\n    }, 1000);\n  }\n};\n \nperson.greetLater();<\/pre>\n\n\n\n<p><strong>2\u3001\u6848\u4f8b\u4e8c<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/\u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u6df7\u6dc6 this \u6307\u5411\nvar outer = {\n  name: \"Outer Object\",\n  innerFunction: function () {\n    var inner = {\n      name: \"Inner Object\",\n      nestedFunction: function () {\n        console.log(this.name); \/\/ \u8fd9\u91cc this \u6307\u5411 inner\uff0c\u800c\u4e0d\u662f outer\n      }\n    };\n    inner.nestedFunction();\n  }\n};\n\nouter.innerFunction();\n<\/pre>\n\n\n\n<p>nestedFunction \u662f\u4f5c\u4e3a inner \u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\uff0cthis\u6307\u5411 inner \u5bf9\u8c61\uff08\u6839\u636e\u666e\u901a\u51fd\u6570 this \u6307\u5411\u7684\u89c4\u5219\uff0c\u5f53\u51fd\u6570\u4f5c\u4e3a\u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\u65f6\uff0cthis \u4f1a\u6307\u5411\u8c03\u7528\u8be5\u51fd\u6570\u7684\u5bf9\u8c61\u3002\uff09<\/p>\n\n\n\n<p><strong>\u4e94\u3001\u4f7f\u7528\u5916\u5c42\u4f5c\u7528\u57dfthis\u7684\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u60f3\u8981\u8bbf\u95ee\u5230 outer \u5bf9\u8c61\u7684 name \u5c5e\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4e24\u79cd\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<p>1\u3001\u4fdd\u5b58\u5916\u5c42 this \u7684\u5f15\u7528<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var outer = {\n  name: \"Outer Object\",\n  innerFunction: function () {\n    var self = this;\n    var inner = {\n      name: \"Inner Object\",\n      nestedFunction: function () {\n        console.log(self.name); \/\/ \u73b0\u5728\u53ef\u4ee5\u8bbf\u95ee\u5230 outer \u7684 name \u5c5e\u6027\uff0c\u8f93\u51fa \"Outer Object\"\n      }\n    };\n    inner.nestedFunction();\n  }\n};\n\nouter.innerFunction();\n<\/pre>\n\n\n\n<p>\u5728\u65b9\u6cd5\u7684\u5f00\u5934\u5148\u628a this \u4fdd\u5b58\u5230\u4e00\u4e2a\u53d8\u91cf\u4e2d\uff08\u901a\u5e38\u547d\u540d\u4e3a self \u6216 that \u7b49\uff09\uff0c\u7136\u540e\u5728 inner \u5bf9\u8c61\u4e2d\u4f7f\u7528\u8fd9\u4e2a\u4fdd\u5b58\u7684\u53d8\u91cf\u6765\u8bbf\u95ee outer \u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n<p><strong>2\u3001\u4f7f\u7528\u7bad\u5934\u51fd\u6570<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var outer = {\n  name: \"Outer Object\",\n  innerFunction: function () {\n    var inner = {\n      name: \"Inner Object\",\n      nestedFunction: () => {\n        console.log(this.name); \/\/ \u8f93\u51fa \"Outer Object\"\n      }\n    };\n    inner.nestedFunction();\n  }\n};\n\nouter.innerFunction();\n<\/pre>\n\n\n\n<p>\u5c06 nestedFunction \u6539\u4e3a\u7bad\u5934\u51fd\u6570\uff0c\u56e0\u4e3a\u7bad\u5934\u51fd\u6570\u4f1a\u7ee7\u627f\u5916\u5c42\u4f5c\u7528\u57df\u7684 this\uff0c\u5728\u8fd9\u91cc\u5916\u5c42\u4f5c\u7528\u57df\u662f outer.innerFunction()\uff0c\u5176 this \u6307\u5411 outer \u5bf9\u8c61\uff0c\u6240\u4ee5\u7bad\u5934\u51fd\u6570\u91cc\u7684 this \u4e5f\u80fd\u6307\u5411 outer \u5bf9\u8c61\u3002<\/p>\n\n\n\n<p><strong>\u516d\u3001JavaScript\u7684this \u548c Java\u7684 this \u6709\u4ec0\u4e48\u4e0d\u540c\u5417\uff1f<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>JavaScript \u548c Java \u4e2d\u7684&nbsp;<code>this<\/code>&nbsp;\u5173\u952e\u5b57\u867d\u7136\u540d\u79f0\u76f8\u540c\uff0c\u4f46&nbsp;<strong>\u5de5\u4f5c\u673a\u5236\u622a\u7136\u4e0d\u540c<\/strong>\u3002\u7406\u89e3\u8fd9\u4e9b\u5dee\u5f02\u662f\u907f\u514d\u6df7\u6dc6\u7684\u5173\u952e\uff1a<\/p>\n\n\n\n<p><strong>\u6838\u5fc3\u533a\u522b\u6982\u89c8<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><strong>\u7279\u6027<\/strong><\/th><th><strong>JavaScript<\/strong><\/th><th><strong>Java<\/strong><\/th><\/tr><\/thead><tbody><tr><td><strong>\u7ed1\u5b9a\u65f6\u673a<\/strong><\/td><td>\u52a8\u6001\u7ed1\u5b9a\uff08\u8fd0\u884c\u65f6\u786e\u5b9a\uff09<\/td><td>\u9759\u6001\u7ed1\u5b9a\uff08\u7f16\u8bd1\u65f6\u786e\u5b9a\uff09<\/td><\/tr><tr><td><strong>\u4f5c\u7528\u57df\u89c4\u5219<\/strong><\/td><td>\u51fd\u6570\u4f5c\u7528\u57df\uff08\u53d6\u51b3\u4e8e\u8c03\u7528\u65b9\u5f0f\uff09<\/td><td>\u7c7b\u4f5c\u7528\u57df\uff08\u6307\u5411\u5f53\u524d\u5b9e\u4f8b\uff09<\/td><\/tr><tr><td><strong>\u5168\u5c40\u73af\u5883\u4e2d\u7684&nbsp;<code>this<\/code><\/strong><\/td><td>\u6d4f\u89c8\u5668\u4e2d\u6307\u5411&nbsp;<code>window<\/code>\uff0cNode.js \u4e2d\u6307\u5411&nbsp;<code>global<\/code><\/td><td>\u65e0\u5168\u5c40&nbsp;<code>this<\/code>\uff0c\u53ea\u80fd\u5728\u7c7b\u65b9\u6cd5\u4e2d\u4f7f\u7528<\/td><\/tr><tr><td><strong>\u6784\u9020\u51fd\u6570\u4e2d\u7684&nbsp;<code>this<\/code><\/strong><\/td><td>\u521b\u5efa\u5e76\u8fd4\u56de\u65b0\u5bf9\u8c61<\/td><td>\u5f15\u7528\u6b63\u5728\u521b\u5efa\u7684\u5b9e\u4f8b<\/td><\/tr><tr><td><strong>\u9759\u6001\u65b9\u6cd5\u4e2d\u7684&nbsp;<code>this<\/code><\/strong><\/td><td>\u6307\u5411\u5168\u5c40\u5bf9\u8c61\u6216\u6784\u9020\u51fd\u6570\u672c\u8eab\uff08\u53d6\u51b3\u4e8e\u8c03\u7528\u65b9\u5f0f\uff09<\/td><td>\u65e0\u6cd5\u4f7f\u7528&nbsp;<code>this<\/code>\uff08\u9759\u6001\u65b9\u6cd5\u5c5e\u4e8e\u7c7b\u800c\u975e\u5b9e\u4f8b\uff09<\/td><\/tr><tr><td><strong>\u7bad\u5934\u51fd\u6570<\/strong><\/td><td>\u7ee7\u627f\u81ea\u5916\u5c42\u4f5c\u7528\u57df\u7684&nbsp;<code>this<\/code><\/td><td>\u65e0\u7bad\u5934\u51fd\u6570\u6982\u5ff5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>\u8be6\u7ec6\u5bf9\u6bd4\u5206\u6790<\/strong><\/p>\n\n\n\n<p>1. JavaScript \u7684&nbsp;<code>this<\/code><\/p>\n\n\n\n<ul>\n<li>\u52a8\u6001\u7ed1\u5b9a\uff1a<code>this<\/code>&nbsp;\u7684\u503c\u53d6\u51b3\u4e8e\u51fd\u6570\u7684\u8c03\u7528\u65b9\u5f0f\uff0c\u800c\u975e\u5b9a\u4e49\u4f4d\u7f6e\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5168\u5c40\u4f5c\u7528\u57df\nconsole.log(this === window); \/\/ true\uff08\u6d4f\u89c8\u5668\u73af\u5883\uff09\n\n\/\/ \u51fd\u6570\u8c03\u7528\nfunction showThis() {\n  console.log(this); \/\/ window\uff08\u975e\u4e25\u683c\u6a21\u5f0f\uff09\u6216 undefined\uff08\u4e25\u683c\u6a21\u5f0f\uff09\n}\n\n\/\/ \u5bf9\u8c61\u65b9\u6cd5\nconst obj = {\n  name: 'Alice',\n  greet() {\n    console.log(this.name); \/\/ 'Alice'\n  }\n};\n\n\/\/ \u6784\u9020\u51fd\u6570\nfunction Person(name) {\n  this.name = name; \/\/ this \u6307\u5411\u65b0\u521b\u5efa\u7684\u5b9e\u4f8b\n}\n\n\/\/ \u7bad\u5934\u51fd\u6570\nconst arrow = () => {\n  console.log(this); \/\/ \u7ee7\u627f\u81ea\u5916\u5c42\u4f5c\u7528\u57df\uff08\u5982\u5168\u5c40\u4f5c\u7528\u57df\uff09\n};<\/pre>\n\n\n\n<p>2. Java \u7684&nbsp;<code>this<\/code><\/p>\n\n\n\n<ul>\n<li>\u9759\u6001\u7ed1\u5b9a\uff1a<code>this<\/code>&nbsp;\u59cb\u7ec8\u6307\u5411\u5f53\u524d\u5b9e\u4f8b\uff0c\u5728\u7f16\u8bd1\u65f6\u5373\u53ef\u786e\u5b9a\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Person {\n  private String name;\n\n  \/\/ \u6784\u9020\u51fd\u6570\n  public Person(String name) {\n    this.name = name; \/\/ this \u6307\u5411\u6b63\u5728\u521b\u5efa\u7684\u5b9e\u4f8b\n  }\n\n  \/\/ \u5b9e\u4f8b\u65b9\u6cd5\n  public void greet() {\n    System.out.println(\"Hello, \" + this.name); \/\/ \u8bbf\u95ee\u5b9e\u4f8b\u5c5e\u6027\n  }\n\n  \/\/ \u9759\u6001\u65b9\u6cd5\uff08\u65e0\u6cd5\u4f7f\u7528 this\uff09\n  public static void staticMethod() {\n    \/\/ this.name = \"Bob\"; \/\/ \u7f16\u8bd1\u9519\u8bef\uff1a\u9759\u6001\u65b9\u6cd5\u4e2d\u4e0d\u80fd\u4f7f\u7528 this\n  }\n}<\/pre>\n\n\n\n<p><strong>\u5e38\u89c1\u573a\u666f\u5bf9\u6bd4<\/strong><\/p>\n\n\n\n<p>1. \u5168\u5c40\u73af\u5883<\/p>\n\n\n\n<ul>\n<li>JavaScript\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">console.log(this); \/\/ \u6d4f\u89c8\u5668\u4e2d\u662f window \u5bf9\u8c61<\/pre>\n\n\n\n<ul>\n<li>Java\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u9519\u8bef\uff1a\u65e0\u6cd5\u5728\u7c7b\u5916\u90e8\u4f7f\u7528 this\nSystem.out.println(this); \/\/ \u7f16\u8bd1\u9519\u8bef<\/pre>\n\n\n\n<p>2. \u5bf9\u8c61\u65b9\u6cd5<\/p>\n\n\n\n<ul>\n<li>JavaScript\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">const obj = {\n  value: 100,\n  getValue() {\n    return this.value; \/\/ this \u6307\u5411 obj\n  }\n};<\/pre>\n\n\n\n<ul>\n<li>Java\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MyClass {\n  private int value = 100;\n  public int getValue() {\n    return this.value; \/\/ this \u6307\u5411\u5f53\u524d\u5b9e\u4f8b\n  }\n}<\/pre>\n\n\n\n<p>3. \u6784\u9020\u51fd\u6570<\/p>\n\n\n\n<ul>\n<li>JavaScript\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">function Car(make) {\n  this.make = make; \/\/ this \u6307\u5411\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\n}\n\nconst myCar = new Car(\"Toyota\");<\/pre>\n\n\n\n<ul>\n<li>Java\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Car {\n  private String make;\n  public Car(String make) {\n    this.make = make; \/\/ this \u6307\u5411\u6b63\u5728\u521b\u5efa\u7684\u5b9e\u4f8b\n  }\n}<\/pre>\n\n\n\n<p><h4 class=\"header-pHVx_G auto-hide-last-sibling-br\" style=\"-webkit-font-smoothing: antialiased; box-sizing: border-box; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-bottom: var(--md-box-samantha-h4-margin-bottom) !important; padding-bottom: 0px !important; font-weight: 700; line-height: var(--md-box-samantha-h4-line-height); margin-top: var(--md-box-samantha-h4-margin-top); font-size: 16px; color: rgb(0, 0, 0); overflow-anchor: auto; font-family: Inter, -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, &quot;SF Pro SC&quot;, &quot;SF Pro Display&quot;, &quot;SF Pro Icons&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">4. \u9759\u6001\u65b9\u6cd5<\/h4><\/p>\n\n\n\n<ul>\n<li>JavaScript\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class MyClass {\n  static staticMethod() {\n    console.log(this === MyClass); \/\/ true\uff08this \u6307\u5411\u7c7b\u672c\u8eab\uff09\n  }\n}<\/pre>\n\n\n\n<p>Java\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MyClass {\n  public static void staticMethod() {\n    \/\/ this \u65e0\u6cd5\u4f7f\u7528\n  }\n}<\/pre>\n\n\n\n<p>5. \u5185\u90e8\u7c7b<\/p>\n\n\n\n<ul>\n<li>JavaScript\uff08\u7bad\u5934\u51fd\u6570\uff09\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class Outer {\n  constructor() {\n    this.value = 100;\n  }\n\n  method() {\n    const inner = () => {\n      console.log(this.value); \/\/ \u7ee7\u627f\u81ea Outer \u7684 this\n    };\n    inner();\n  }\n}<\/pre>\n\n\n\n<ul>\n<li>Java\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Outer {\n  private int value = 100;\n\n  public class Inner {\n    public void printValue() {\n      System.out.println(Outer.this.value); \/\/ \u663e\u5f0f\u5f15\u7528\u5916\u90e8\u7c7b\u7684 this\n    }\n  }\n}<\/pre>\n\n\n\n<p><strong>\u603b\u7ed3\uff1a\u5982\u4f55\u907f\u514d\u6df7\u6dc6\uff1f<\/strong><\/p>\n\n\n\n<ol>\n<li><strong>\u7262\u8bb0 JavaScript \u7684\u52a8\u6001\u7ed1\u5b9a\u7279\u6027<\/strong>\uff1a\n<ul>\n<li>JavaScript \u7684&nbsp;<code>this<\/code>&nbsp;\u53d6\u51b3\u4e8e&nbsp;<strong>\u8c03\u7528\u65b9\u5f0f<\/strong>\uff0c\u800c\u975e\u5b9a\u4e49\u4f4d\u7f6e\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u7bad\u5934\u51fd\u6570\u4fdd\u7559\u4e0a\u4e0b\u6587\uff0c\u6216\u901a\u8fc7&nbsp;<code>bind()<\/code>\u3001<code>call()<\/code>\u3001<code>apply()<\/code>&nbsp;\u663e\u5f0f\u7ed1\u5b9a&nbsp;<code>this<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7406\u89e3 Java \u7684\u9759\u6001\u7ed1\u5b9a\u7279\u6027<\/strong>\uff1a\n<ul>\n<li>Java \u7684&nbsp;<code>this<\/code>&nbsp;\u59cb\u7ec8\u6307\u5411&nbsp;<strong>\u5f53\u524d\u5b9e\u4f8b<\/strong>\uff0c\u4e0d\u5b58\u5728\u52a8\u6001\u53d8\u5316\u3002<\/li>\n\n\n\n<li>\u9759\u6001\u65b9\u6cd5\u4e2d\u4e0d\u80fd\u4f7f\u7528&nbsp;<code>this<\/code>\uff0c\u56e0\u4e3a\u9759\u6001\u65b9\u6cd5\u5c5e\u4e8e\u7c7b\u800c\u975e\u5b9e\u4f8b\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6ce8\u610f\u573a\u666f\u5dee\u5f02<\/strong>\uff1a\n<ul>\n<li>JavaScript \u7684\u5168\u5c40\u73af\u5883\u4e2d\u6709&nbsp;<code>this<\/code>\uff08\u6307\u5411&nbsp;<code>window<\/code>&nbsp;\u6216&nbsp;<code>global<\/code>\uff09\uff0c\u800c Java \u6ca1\u6709\u3002<\/li>\n\n\n\n<li>JavaScript \u7684\u7bad\u5934\u51fd\u6570\u548c Java \u7684\u5185\u90e8\u7c7b\u5bf9&nbsp;<code>this<\/code>&nbsp;\u7684\u5904\u7406\u4e0d\u540c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u8f6c\u8f7d\uff1ahttps:\/\/www.jb51.net\/javascript\/3394889at.htm \u524d\u8a00 thi [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/17446"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=17446"}],"version-history":[{"count":4,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/17446\/revisions"}],"predecessor-version":[{"id":17450,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/17446\/revisions\/17450"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}