1. 先获取需要导出数据列表的日期范围
2. 确定导出接口（环境地址 与 接口地址拼接）（例如：接口地址 ‘/pc/list/export’）
3. 用axios设置method，url，data，headers，responseType，（注意：headers里边需要携带token，否则会报错：请登录）
4. 获取到返回值后，设置文件

toExport() {
      if (this.form.date == "" || this.form.date == undefined) {
        this.$message.warning("请选择导出日期");
        return;
      }
      if (this.form.date != null && this.form.date != undefined) {
        this.beginTime= this.form.date[0];
        this.endTime= this.form.date[1];
      }
      const apiUrl = process.env.API + "/pc/list/export";
      axios({
        method: "post",
        url: apiUrl,
        data: {
          beginTime: this.beginTime, //开始时间
          endTime: this.endTime, //结束时间
        },
        headers: {
          token: "" // 设置token字段 不是Authorization哦
        },
        responseType: "blob"
      }).then(res => {
        console.log(147, res);
        const link = document.createElement("a");
        let blob = new Blob([res.data], {
          type:
            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
        });
        link.style.display = "none";
        link.href = URL.createObjectURL(blob);
        var fileName = "数据列表.xlsx";
        fileName = this.videoStartDate + "至" + this.videoEnddate + fileName;
        link.setAttribute("download", fileName);
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
      });
    }