//保存圖片
    SaveImg:function(){
      this.DownloadIamge(this.Img, 'share')
    },
    DownloadIamge:function(imgsrc, name) {//圖片地址和圖片名
      var image = new Image();
      // 解決跨域 Canvas 污染問題
      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"); //得到圖片的base64編碼數據
        var a = document.createElement("a"); // 生成一個a元素
        var event = new MouseEvent("click"); // 創建一個單擊事件
        a.download = name || "photo"; // 設置圖片名稱
        a.href = url; // 將生成的URL設置為a.href屬性
        a.dispatchEvent(event); // 觸發a的單擊事件
      };
      image.src = imgsrc;
    },