为什么DOM有窗口和自己？ [英] Why does the DOM have both window and self?

问题描述

为什么DOM在同一件事情中有一个名为 self 的对象，另一个叫窗口要添加到混淆窗口有一个名为 self的属性，因此：

Why does the DOM have an object called self and another called window when they are the same thing? To add to the confusion window has a property called self so:

window === window.self === self

为什么是这样的？我应该使用哪一个？

Why is it like this? Which one should I use?

推荐答案

self 由javascript定义环境并指向[全局]对象（但不是规范的一部分，因此可能不存在），而窗口是DOM规范的一部分。
在大多数浏览器中，窗口用作[全局]对象，但并不总是这样。

self is defined by the javascript environment and points to the [global] object (but is not part of the spec, so might not be there), while window is part of the DOM specification. In most browsers the window is used as the [global] object, but this is not always so.

self == window.self 不奇怪，因为它们是相同的对象 - 当 self 正在查找，它被发现作为全局对象（窗口）的属性。所以它实际上与 window.self == window.self 相同。

That self == window.self is not strange as they are the same object - when self is being looked up, it is found as a property of the global object (window). So it is in fact the same as window.self == window.self.

如其他地方所述，可以参考 [global] 对象，你应该通过在全局中运行 var global = this; 来定义你的sef执行上下文。

As noted elsewhere, to reliable reference the [global] object, you should define it your sef by running var global = this; in the global execution context.

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