Erasing in HTML5 canvas (even in IE)

I'm woking on the tool that allows user to erase areas on canvas element. I used globalCompositeOperation="copy" and rgba(0,0,0,0).

It works well in modern browsers but not in IE. I also use excanvas.js开发者_如何学Go but erasing doesn't work at all.

Are there any way to implement erasing in IE?

Simple answer is that canvas is not supported in IE, and excanvas.js does not implement all functions of canvas, including globalCompositeOperation--

see http://code.google.com/p/explorercanvas/issues/detail?id=10

As for an alternative, could you link to the code so that we have a better idea of what you're trying to accomplish?