js 下载后端接口返回的文件流

// downloadFile是你请求后端的接口
 downloadFile().then((res) => {
     const url = window.URL.createObjectURL(new Blob([res.data]));
     const link = document.createElement("a");
     link.style.display = "none";
   	 link.href = url;
     link.setAttribute("download", fileData.name);
     document.body.appendChild(link);
     link.click();
     document.body.removeChild(link);
     window.URL.revokeObjectURL(url);
  });