instanceof won't worik because a function within an iframe won't have
the same constructor as one outside of it.
On Aug 4, 10:04 am, DBJDBJ <dbj...@gmail.com> wrote:
> Worryingly in IE8 this is the "state of play" :
> // IE8
> Object.prototype.toString(Error.valueOf)
> /* [object Object] */
> typeof Error.valueOf
> /* function */
>
> JavaScript Error is not DOM object. Is this an "edge case" or not?
> Anyway, I posted too fast, the version bellow works.
> ( function () {
> // GPL (c) 2009 by DBJ.ORG
> isFunction = typeof (top.alert) === "object" ?
> function(x) {
> switch (typeof x) {
> case "function" : return true ;
> case "object" : return (x + "").match(/
> function/) !== null ;
> default : return false ;
> }
> }
> : /* non IE browsers use this */
> function (x) {
> return x instanceof Function;
> }
>
> })()
>
> @Azat : "By the way, ‘x instanceof Function’ leaks for window and DOM
> objects in IE. " ...
> True. But above "instanceof" is used only in non-IE browsers.
>
> --DBJ
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