js 通过图片链接下载到本地

        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);
            let Link = document.createElement("a");
            Link.download = "下载名字";
            Link.href = url;
            Link.click();
            Link.remove();
            // 用完释放URL对象
            URL.revokeObjectURL(url);
          });
        }

* url 为图片地址 如：https://t7.baidu.com/it/u=816042678,3339142019&fm=193&f.gif