阻止Alert攻击代码

下面是Jon McClintock贡献出来的一段阻止Alert的代码.略掠看了一下,感叹不已.难怪老外们都评价为

That’s a great example

I just got a nice XSS “win” that I thought I’d share with you. The app had an odd filter that would block JS calls to the alert() method.

So this (invalid JS) input got in:

";alert"xss";

But this didn’t:

";alert("xss");

The usual whitespace and comment tricks didn’t work either, and other useful methods, such as eval, were also blocked. So what do you do? Function pointer, of course:

";var foo=alert;foo("xss");