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?

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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?