oh,thank you
i see
On Jan 8, 9:25 am, Ricardo Tomasi <ricardob...@gmail.com> wrote:
> 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?
