vue下载文件流

//Trial Balance 导出
const triEx = data => {
  return serviceJson({
    url: "/rbTrialBalanceUpload/exportData",
    method: "POST",
    data,
    responseType: "arraybuffer"
  });
};
// 导出
      expt(){
        let params = {
          period: this.date,
          company: this.company,
        }
        ReApi.triEx(params, {
            responseType: "blob"
          })
          .then(res => {
            const blob = new Blob([res.data]);
            //对于<a>标签，只有 Firefox 和 Chrome（内核） 支持 download 属性
            //IE10以上支持blob但是依然不支持download
            if ("download" in document.createElement("a")) {
              //支持a标签download的浏览器
              const link = document.createElement("a"); //创建a标签
              link.download = res.headers["content-disposition"].substring(20); //a标签添加属性
              link.style.display = "none";
              link.href = URL.createObjectURL(blob);
              document.body.appendChild(link);
              link.click(); //执行下载
              URL.revokeObjectURL(link.href); //释放url
              document.body.removeChild(link); //释放标签
            } else {
              this.$openWarning(`Browser does not support download`);
            }
          })
          .catch(err => {});
      }