html2canvas 引入跨域图片时报错, base64 报错。

Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.    https://github.com/niklasvh/html2canvas/issues/1614javascript 朋友圈h5须要动态生成一些长按分享的图片， 用html2canvas最合适不过。可是常

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