Hi, Kasper,
But something is still not clear
1. For the two samples, they have similar form(for the 1st sample, take
"document" as "object", and "write" a method under "object")
var alias = object.fun;
alias("something");
If "write" can't get resolved under global scope in the 1st sample, then why
should "foo" can be resolved for 2nd sample? Since they are so alike to each
other.
2. Sample 1 can be executed on IE, but it can't get runned on chrome. Which
one is standard conformance?
Cheers
Xiang
2010/1/23 Kasper Lund <[email protected]>
> Hi Xiang,
>
> I haven't looked closely at this issue, but if I had to guess I would
> attribute the difference to the fact that 'this' is bound differently
> in the call to write in the two cases. In the first case, 'this' will
> be the global object - that is the window object not the document -
> and in the second case 'this' will be the document.
>
> Cheers,
> Kasper
>
> On Sat, Jan 23, 2010 at 5:09 AM, Xiang Zhong <[email protected]> wrote:
> > Hi, friends,
> > I got an interesting question here
> > Script like this can't be executed, it will throw a exception invocation
> > error.
> > <script>
> > var alias = document.write;
> > alias("something");
> > </script>
> >
> >
> > But if we define the script like the following, then it is OK for
> excution.
> >
> > <script>
> > function constructor(){};
> > var object = new constructor();
> > object.fun = function (str){document.write(str);}
> >
> > var alias = object.fun;
> > alias("something");
> > </script>
> >
> > Why these two behavior differently?
> > What is the reason?
> >
> > Cheers~
> > Xiang
> >
> > --
> > v8-users mailing list
> > [email protected]
> > http://groups.google.com/group/v8-users
>
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