vue实现下载图片文件，将图片类型的文件下载到本地

//下载文件,文件
export function download(data,name) {
  if (!data) {
    return;
  }
  getUrlBase64(data).then((base64) => {
    let a = document.createElement("a");
    a.style.display = "none";
    a.download = name;
    a.href = base64;
    document.body.appendChild(a);
    a.click();
  });
}
export function getUrlBase64(url) {
  return new Promise((resolve) => {
    let canvas = document.createElement("canvas");
    let ctx = canvas.getContext("2d");
    let img = new Image();
    img.crossOrigin = "Anonymous"; //允许跨域
    img.src = url;
    img.onload = function () {
      canvas.height = 300;
      canvas.width = 300;
      ctx.drawImage(img, 0, 0, 300, 300);
      let dataURL = canvas.toDataURL("image/png");
      canvas = null;
      resolve(dataURL);
    };
  });
}