vue element之axios下载文件（后端Python）

axios.post(
    apiUrl,
    formdata, 
    {responseType:'arraybuffer'}
).then(res=> {
　　if (res.status === 200) {

  　　let blob = new Blob([res.data], {
  　　  type: res.headers['content-type']
 　　 });

 　　 const fileName = res.headers['content-disposition'];
　　  const title = fileName && (fileName.indexOf('filename=') !== -1) ? fileName.split('=')[1] : 'download';

　　　 require('script-loader!file-saver');

　　  saveAs(blob, title);
} 

})
.catch();

from flask import send_from_directory

@admin_bp.route('/tasksothers/download', methods=["GET", "POST"])
@auth.login_required
def api_tasksothers_download():
        root_path = ''
        src_name = "a.sql"
        upload_path = os.path.join(root_path, src_name)
        print("upload_path =", upload_path)
        if os.path.isfile(upload_path):
            response = send_from_directory(root_path, src_name, as_attachment=True)
            print("response: ",response)

            response.headers["Access-Control-Expose-Headers"] = "Content-disposition"
            print("response: ", response.headers)
            return response