vue 如何根據後臺返回來的圖片url進行圖片下載

downloadByBlob(url, name) {
      let image = new Image();
      image.setAttribute("crossOrigin", "anonymous");
      image.src = url;
      image.onload = () => {
        let canvas = document.createElement("canvas");
        canvas.width = image.width;
        canvas.height = image.height;
        let ctx = canvas.getContext("2d");
        ctx.drawImage(image, 0, 0, image.width, image.height);
        canvas.toBlob(blob => {
          let url = URL.createObjectURL(blob);
          this.download(url, name);
          // 用完釋放URL對象
          URL.revokeObjectURL(url);
        });
      };
    },
    download(href, name) {
      let eleLink = document.createElement("a");
      eleLink.download = name;
      eleLink.href = href;
      eleLink.click();
      eleLink.remove();
    }