JS 通过 URL 下载文件并重命名（两种方式）

// 下载文件
function downloadFile() {
  const link = document.createElement('a');
  link.style.display = 'none';
  // 设置下载地址
  link.setAttribute('href', file.sourceUrl);
  // 设置文件名
  link.setAttribute('download', file.fileName);
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
}

async function download(downloadUrl: string, downloadFileName: string ) {
  const blob = await getBlob(downloadUrl);
  saveAs(blob, downloadFileName );
}

function getBlob(url: string) {
  return new Promise<Blob>((resolve, reject) => {
    const xhr = new XMLHttpRequest();

    xhr.open('GET', url, true);
    xhr.responseType = 'blob';
    xhr.onload = () => {
      if (xhr.status === 200) {
        resolve(xhr.response);
      } else {
        reject(new Error(`Request failed with status ${xhr.status}`));
      }
    };
    xhr.onerror = () => {
      reject(new Error('Request failed'));
    };

    xhr.send();
  });
}

function saveAs(blob: Blob, filename: string) {
  const link = document.createElement('a');
  const body = document.body;

  link.href = window.URL.createObjectURL(blob);
  link.download = filename;

  // hide the link
  link.style.display = 'none';
  body.appendChild(link);

  link.click();
  body.removeChild(link);

  window.URL.revokeObjectURL(link.href);
}