feat:html2canvas

public/js/html2canvas.js

@@ -6462,7 +6462,7 @@ var cloneCanvasContents = function cloneCanvasContents(canvas, clonedCanvas) {
         if (clonedCanvas) {
             clonedCanvas.width = canvas.width;
             clonedCanvas.height = canvas.height;
-            var ctx = canvas.getContext('2d');
+            var ctx = canvas.getContext('2d',{willReadFrequently: true});
             var clonedCtx = clonedCanvas.getContext('2d');
             if (ctx) {
                 clonedCtx.putImageData(ctx.getImageData(0, 0, canvas.width, canvas.height), 0, 0);