[JavaScript知识库]前端 下载Excel 后端返回的是文件流

    downFun() {
      this.confirmBox("确认下载所选记录?", "提示")
        .then(() => {
          exportOrgan({...this.formData,districtCode: this.treeNode.areaCode}).then((res) => {
            if (res.code != 200) {
              return this.msgError(res.msg);
            }
            const fileName = res.data;
            download(fileName).then((resp) => {
              this.downloadFun(resp);
            });
          });
        })
        .catch(() => {});
    },
   downloadFun(resp) {
      const mimeType =
        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
      var patt = new RegExp("filename=([^;]+.[^.;]+);*");
      var contentDisposition = decodeURI(resp.headers["content-disposition"]);
      var result = patt.exec(contentDisposition);
      var fn = result[1].split(";")[0];
      const aLink = document.createElement("a");
      var blob = new Blob([resp.data], {
        type: mimeType,
      });
      aLink.href = window.URL.createObjectURL(blob);
      aLink.setAttribute("download", fn); // 设置下载文件名称
      document.body.appendChild(aLink);
      aLink.click();
      document.body.removeChild(aLink);
    },

接口
// 导出机构信息管理
export function exportOrgan(query) {
    return get(
        '/organ/export',
        query
    )
}
export function download(fileName){
    return http({
        method:'get',
        url:'/common/download',
        params:{fileName:encodeURI(fileName),delete:true},
        headers:{Authorization:auth}
    })
}