canvas toDataUrl 跨域问题

 Uncaught SecurityError: Failed to execute ‘toDataURL‘ on ‘HTMLCanvasElement‘: Tainted canvases may not be exported.

SecurityError: The operation is insecure.

Access-Control-Allow-Origin: *

    image.crossOrigin = "Anonymous";
    image.onload = function(){
        context.drawImage(this, 0, 0, 400, 300);
        var base64Url = canvas.toDataURL("image/png");
        console.log(base64Url);
    };
    image.src = imageSrc;