我应该使用self或window来引用全局范围吗？

Question

As a style convention I like to be explicit when I'm accessing variables in the global scope, preferring

window.example = "Hello";
window.alert(window.example);

to the less verbose

example = "Hello";
alert(example);

I now have a module which could be used directly from the browser, or, if they're available, from a web worker. In web workers the global object is called self , while in the browser it's called window .

The window object has a self property, so self.example = "Hello" would work in both contexts, so long as no-one redeclares self (as they often do: var self = this ).

What's the best convention to go with?

• Use self and hope no-one declares a conflicting self .
• If window is defined, use window , otherwise use self .
• Something else?

Having thought about it, I'm inclined to go with the second one.

Answer 1

In the global scope, either in the page or a web worker, you can write code like this:

(function( global ) {
  // ... whatever
}( this );

Then inside that main outer function you can use "global" (or call it "window" or "self" or "whatever") and it'll work in either context (or in Node.js for that matter).

Answer 2

我建议

var global; try { global = window } catch(e) { global = self }

Answer 3

您可以创建自己的窗口或自我引用：

var my_window = window || self;