Uncaught DOMException: Failed to execute ‘toDataURL‘ on ‘HTMLCanvasElement‘: Tainted canvases may no

未捕获的DomeException：未能在“HTMLCanvaElement”上执行“toDataURL”：可能无法导出受污染的画布。出现这个bug的原因可能有：

1.图片跨域

 let plShareImg = new Image();
 plShareImg.crossOrigin = "anonymous";//添加此行anonymous必须小写
 plShareImg.src = props.plShareImg;

2.图片未处理完就开始画布

plShareImg必须是最后一张图片

plShareImg.onload = () => {
    //开始画布
};

3.导出的图片也需要anonymous

 state.shareImg = new Image();
 state.shareImg.setAttribute("crossOrigin", "anonymous");
 state.shareImg = cvs.toDataURL("image/png");//最终海报