canvas.toDataURL("image/jpg;base64;"); canvas提交img时报错：
Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.
原因是：
your local drive is declared to be "other-domain" and will taint the canvas, your most sensitive info is likely on your local drive!
简单来讲，就是跨域问题。
解决方法：
img.setAttribute("crossOrigin",'anonymous');
或者
img.crossOrigin = 'anonymous';
可能还是不行，请看下面：
img html tag
<img crossorigin="anonymous">...</img>
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