vue项目开发时，需要对文件进行导出操作，这就需要用到下载文件操作，这里使用的是axios进行下载操作。

async exportData() {
  var data = qs.stringify({queryParam: this.data.queryParam})
  let url = '/openApi/apiorderinfo/export?' + data;
  this.downloadLoading = true;
  axios.get(url, {
    baseURL: window.SITE_CONFIG['apiURL'],
    responseType: 'blob', //设置响应的数据类型为一个包含二进制数据的 Blob 对象，必须设置
    headers: {
      Authorization: 'Bearer ' + Cookies.get('access_token'),
    }
  }).then(res => {
    this.downloadLoading = false
    if (!res) {
      this.$message.error("下载模板文件失败");
      return false;
    }
    const blob = new Blob([res.data], {type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8'});
    const downloadElement = document.createElement('a');
    const href = window.URL.createObjectURL(blob);
    let contentDisposition = res.headers['content-disposition'];  //从response的headers中获取filename, 后端response.setHeader("Content-disposition", "attachment; filename=xxxx.docx") 设置的文件名;
    let patt = new RegExp("filename=([^;]+\\.[^\\.;]+);*");
    let result = patt.exec(contentDisposition);
    let filename = decodeURI(result[1]);
    downloadElement.style.display = 'none';
    downloadElement.href = href;
    downloadElement.download = filename; //下载后文件名
    document.body.appendChild(downloadElement);
    downloadElement.click(); //点击下载
    document.body.removeChild(downloadElement); //下载完成移除元素
    window.URL.revokeObjectURL(href); //释放掉blob对象
  }).catch(function (error) { // 请求失败处理
    console.log(error);
  });
},