javascript - JavaScript 中的 window.window

Question

为什么浏览器中的window对象指向window对象。 Mozilla 网站将原因声明为

The point of having the window property refer to the object itself was (probably) to make it easy to refer to the global object (otherwise you'd have to do a manual var window = this; assignment at the top of your script).

所以，我的问题是，如何无限地将对象指向对象，以及这如何有助于避免执行 var window = this;

window.window // returns window object
window.window.window // also returns an window

Answer 1

window.window 或 window.window.window 等等，那不是实现，那是副作用

考虑一下

var win = {};
win.win = win;

现在

win.win === win

和

win.win.win === win

所以他们本可以做的是

var window = this;

其实和

是一样的

this.window = this;

因为在全局范围内声明的所有变量都是this的属性，所以这样做会导致window.window.window.window....