方法一：

downLoadQueryVehicleCSV(
    '/tvdms/search/exportIllegalVehiclePassingAll.do',
     params).then(res =>
     this.fullscreenLoading = false
 ).catch(res => {
     this.fullscreenLoading = false
 });

function downLoadQueryVehicleCSV(url, params) {
    return Axios({
        headers: {
            'Content-Type': 'application/json'
        },
        responseType: 'blob', //一定要写
        method: 'post',
        url: url,
        data: params
    }).then(res => {
        const type = 'application/gzip';
        const blob = new Blob([res.data], {type: type});
        const name = decodeURI(
            res.headers['content-disposition'].split('=')[1]);
        if (window.navigator.msSaveBlob) {  //没有此判断的话，ie11下的导出没有效果
            window.navigator.msSaveBlob(blob,
                name);
        } else {
            const downloadElement = document.createElement('a');
            const href = window.URL.createObjectURL(blob);
            //后台再header中传文件名
            downloadElement.href = href;
            downloadElement.download = name;
            document.body.appendChild(downloadElement);
            downloadElement.click();
            document.body.removeChild(downloadElement);// 下载完成移除元素
        }
        return Promise.resolve(true);
    }).catch(function (error) {
        console.log(error);
        let response = error.response;
        if (response) {
            let status = response.status;
            if (status === 404 || status === 502 || status === 504) {
                Message.error(response.data.message || 'Network Error');
            } else if (status === 500) {
                Message.error(response.statusText);
            }
        } else if (error.message === 'Network Error') {
            Message.error(error.message);
        }
        return Promise.reject(false);
    });
}

方法二：

// 激活码管理-导出文件
function licenseExport () {
  return http({
    method: 'get',
    url: '/cicm/ui/v1/licenseManagement/exportModel'
  })
}

licenseExport().then(res => {
        // this.loadingForSearch = false
      }).catch(err => {
        if (err.status === 200) {
          const type = 'application/gzip'
          const blob = new Blob([err.data], { type: type })
          const name = decodeURI(
            err.headers['content-disposition'].split('=')[1])
          if (window.navigator.msSaveBlob) { // 没有此判断的话，ie11下的导出没有效果
            window.navigator.msSaveBlob(blob,
              name)
          } else {
            const downloadElement = document.createElement('a')
            const href = window.URL.createObjectURL(blob)
            // 后台再header中传文件名
            downloadElement.href = href
            downloadElement.download = name
            document.body.appendChild(downloadElement)
            downloadElement.click()
            document.body.removeChild(downloadElement)// 下载完成移除元素
            window.URL.revokeObjectURL(href) // 释放掉blob对象
          }
        } else {
          // this.$message.error(this.$t('ccc_pageExportErr_button'))
        }
        // this.loadingForSearch = false
      })