JavaScript Standard built-in objects @ Tue, Feb 28, 2023 2:39 PM
JavaScript Standard built-in objects @ Tue, Feb 28, 2023 3:08 PM
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fun.caller === arguments.callee.caller  

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fun.caller === arguments.callee.caller  

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arguments.callee 代表的是正在执行的fun     

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arguments.callee 代表的是正在执行的fun     

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The **`caller`** accessor property of [`Function`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) instances represents the function that invoked this function. For [strict](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode), arrow, async, and generator functions, accessing the `caller` property throws a [`TypeError`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypeError).
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The **`caller`** accessor property of [`Function`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) instances represents the function that invoked this function. For [strict](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode), arrow, async, and generator functions, accessing the `caller` property throws a [`TypeError`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypeError).
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## 关于 this 的一个问题 

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```js

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let obj, method;

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obj = {

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  go: function() { console.log(this); }

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};

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obj.go();               // (1) this obj

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(obj.go)();             // (2) this obj

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(method = obj.go)();    // (3) dom 环境是 window，node 环境 global

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(obj.go || obj.stop)(); // (4) dom 环境是 window，node 环境 global

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```