这个，自我，窗口和窗口之间有什么区别。自己 [英] What is the difference between this, self, window and window.self

问题描述

如果我打开一个空白页面并在javascript控制台中运行以下命令，我会得到相同的结果：

If I open an empty page and I run the following command in javascript console I obtain the same result:

  >>> this
  DOMWindow

  >>> self
  DOMWindow

  >>> window
  DOMWindow

  >>> window.self
  DOMWindow

他们指的是什么？ ...相同的对象或其他什么？

What do they refer to? ...the same object or what else?

推荐答案

window 是对脚本执行的当前浏览器窗口的引用。 window.self 显然是其内部的自引用。由于 self 这里是全局对象窗口的属性，因此它也可以被访问，就像它是全局变量本身：只需自我。

window is the reference to the current browser’s window the script executes in. window.self is obviously a self-reference of that within itself. And since self here is a property of the global object window, it can also be accessed as if it was a "global" variable itself: just self.

所以最后三个在大多数情况下确实是一样的。

So the last three are under most circumstances indeed the same thing.

这个然而完全不同：它是一个指向当前范围的变量。如果您在控制台中执行以下代码：

this however is completely different: it’s a variable pointing to the current scope. If you execute the following code in the console:

> var myPackage = {}
> myPackage.method = function() {console.log(this)}
> myPackage.method()

此将是指向 myPackage 对象（方法的范围）。

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