The page has a screenshot function, and a picture is generated locally, then converted to canvas, and then converted from canvas to png, but canvas.toDataUrl() keeps reporting an error:

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

code show as below:

var url = DOMURL.createObjectURL(svg); var canvas = document.createElement('canvas'); var ctx = canvas.getContext('2d'); canvas.width = window.innerWidth; canvas.height = window.innerHeight*1.25; cacheImg(url,function(){ ctx.drawImage(this , 0 , 0); var image = canvas.toDataURL("image/png").replace("image/png", 'image/octet-stream'); DOMURL.revokeObjectURL(url); }); function cacheImg(url , callback){ var img = new Image() img.setAttribute('crossOrigin', 'Anonymous'); img.src = url; img.onload = function() { callback.call(img) } }