兼容IE浏览器对象不支持toBlob属性或方法问题

ruoyi-admin/src/main/resources/templates/system/user/profile/avatar.html

@@ -237,6 +237,25 @@ function submitHandler() {
 $(window).resize(function() {
     $('.imageBox').height($(window).height() - 80);
 }).resize();
+
+if (!HTMLCanvasElement.prototype.toBlob) {
+    Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
+        value: function(callback, type, quality) {
+            var canvas = this;
+            setTimeout(function() {
+                var binStr = atob(canvas.toDataURL(type, quality).split(',')[1]);
+                var len = binStr.length;
+                var arr = new Uint8Array(len);
+                for (var i = 0; i < len; i++) {
+                    arr[i] = binStr.charCodeAt(i);
+                }
+                callback(new Blob([arr], {
+                    type: type || 'image/png'
+                }));
+            });
+        }
+    });
+}
 </script>
 </body>
 </html>