js保存图片至本地

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//保存图片     SaveImg:function(){       this.DownloadIamge(this.Img, 'share')     },     DownloadIamge:function(imgsrc, name) {//图片地址和图片名       var image = new Image();       // 解决跨域 Canvas 污染问题       image.setAttribute("crossOrigin", "anonymous");       image.onload = function() {         var canvas = document.createElement("canvas");         canvas.width = image.width;         canvas.height = image.height;         var context = canvas.getContext("2d");         context.drawImage(image, 0, 0, image.width, image.height);         var url = canvas.toDataURL("image/png"); //得到图片的base64编码数据         var a = document.createElement("a"); // 生成一个a元素         var event = new MouseEvent("click"); // 创建一个单击事件         a.download = name || "photo"; // 设置图片名称         a.href = url; // 将生成的URL设置为a.href属性         a.dispatchEvent(event); // 触发a的单击事件       };       image.src = imgsrc;     },