Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.

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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>