Question

iClient Classic 正常显示的SuperMap.CanvasLayer导出toDataURL时报错 Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported. 使用超图的MapToImg.js文件进行的地图截图操作报错

    //截取canvas图层
    function getCanvasLayerData(layer) {

        var div = layer.div;
        var canvas0 = div.getElementsByTagName("canvas")[0];
        var imageUrl = canvas0.toDataURL("image/png");

        var img = new Image();
        img.setAttribute('crossOrigin', 'anonymous');

        img.src = imageUrl;

        return img;
    }

已确认这个报错图层是正常获取的，且可以看到其canvas元素并肯定是支持canvas的，请问如何处理？