axios 利用new FileReader() 下载文件获取返回的错误信息

this.axios({

          method: "post",

          url: url,

          data: data,

          responseType: "blob" 

        })

          .then(res => {

            const data = res.data

            let r = new FileReader()

            r.onload = function () {

              try {

                let resData = JSON.parse(this.result)

                console.log(resData)

                if (resData && resData['code'] && resData['code'] != '1000') {

                 alert(resData.msg);//弹出返回的错误msg

                }

              } catch (err) {

                let fileName = '下载文件名.xls'

                // 兼容ie11

                if (window.navigator.msSaveOrOpenBlob) {

                  try {

                    const blobObject = new Blob([data])

                    window.navigator.msSaveOrOpenBlob(blobObject, fileName)

                  } catch (e) {

                    console.log(e)

                  }

                  return

                }

               this.download(data, fileName)

                alert（'导出成功'）

              }

            }

            r.readAsText(data) // FileReader的API

          })

          .catch(e => {

            let msg = "网络异常";

            _that.isCanClick = true

            this.$Message.error(msg);

          });

 

　// 下载文件

    download(data, name) {

      if (!data) {

        return;

      }

      let url = window.URL.createObjectURL(new Blob([data]));

      let link = document.createElement("a");

      link.style.display = "none";

      link.href = url;

      link.setAttribute("download", name);

      document.body.appendChild(link);

      link.click();

    },