完整错误如下：

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

且表现为间接出现，不是100%报错。

继续阅读toDataURL报错: Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement' →