如何使用Javascript和XMLHttpRequest加载二进制图像数据?

I was trying to load an image client side and base64 encode the bytes returned by the server in order to pass it off to perform some processing. IE has a RequestBody property of the XMLHttpRequest object, but I can't seem to use it, and RequestText is truncated. In Firefox, RequestText is there, but seems corrupted.I was trying to load an image client side and b