It has to be a local var:
(function(){
var window = this;
})();
On Jan 7, 11:17 am, Jinpu Hu <huji...@gmail.com> wrote:
> I see "var window = this" from latest svn code
>
> I use firebug debugger it.
>
> info:"Exception: redeclaration of const window"
>
> but in core.js
>
> var
> // Will speed up references to window, and allows munging its name.
> window = this,
> // Will speed up references to undefined, and allows munging its
> name.
> undefined,
> // Map over jQuery in case of overwrite
> _jQuery = window.jQuery,
> // Map over the $ in case of overwrite
> _$ = window.$,
>
> i want to know what does "speed up references to window" mean?
