通过 url 下载并修改文件名称

fileDownload(fileUrl, fileName) {
  const x = new XMLHttpRequest();
  x.open("GET", fileUrl, true);
  x.responseType = "blob";
  x.onload = function (e) {
    const aLink = document.createElement("a");
    aLink.style.display = "none";
    aLink.href = window.URL.createObjectURL(x.response);
    aLink.download = fileName;
    document.body.appendChild(aLink);
    aLink.click();
    document.body.removeChild(aLink);
  };
  x.send();
}