search window in global scope is slower than search window in local
scope
On Jan 8, 9:50 am, Jinpu Hu <huji...@gmail.com> wrote:
> 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?
