Mark Gibson wrote:
> Has anyone noticed some problems with $.extend()-ing prototype, and
> attempting to override existing methods?
>
> Take this example:
>
> var MyObj = function() {};
>
> $.extend(MyObj.prototype, {
> toString: function() { return 'Hello'; }
> });
>
> var obj = new MyObj();
> console.log(obj.toString());
>
> In Firefox, and other browsers, we get: 'Hello'
> In IE (6), we get: '[object Object]'
>
> But, we can extend MyObj.prototype in IE these ways:
>
> MyObj.prototype.toString = ...
> or,
> MyObj.prototype['toString'] = ...
> or,
> MyObj.prototype = {
> toString: ...
> };
>
> all work in IE!
>
> Any ideas why $.extend doesn't work?
>
Ok, I was a bit eager sending this, after a quick shufty through jquery.js,
and a couple of experiments, it appears that $.extend uses a for..in loop.
IE appears to not include any property called 'toString' in the loop
regardless
of where it comes from, and I'd guess it probably does the same with any
other Object methods too (though I'm wasting any more time tested this).
So, a warning for all, don't expect $.extend to copy 'toString' et al, and
don't expect IE to do things as you'd expect :(
Maybe a warning needs adding to the $.extend docs about this?
Regards
- Mark
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