vue如何下载报表

_export() {
      const _c = this.$createElement;
      this.$msgbox({
        title: '请确认',
        showCancelButton: true,
        confirmButtonText: '导出',
        cancelButtonText: '放弃',
        message: _c('div', null, [
          // _c('ul', null, [
          //     _c('li', null, '是否导出当前待发货订单:'),
          //     _c('li', { style: 'margin: .5em 0 .5rem 2em' }, '商品: ' + _item.productName),
          //     _c('li', { style: 'margin: .5em 0 .5rem 2em' }, '颜色: ' + _item.proColorName),
          //     _c('li', { style: 'margin: .5em 0 .5rem 2em' }, '尺码: ' + _item.proSizesName),
          //     _c('li', { style: 'margin: .5em 0 .5rem 2em' }, '时间: ' + _item.applyTime),
          //     _c('li', { style: 'margin: .5em 0 .5rem 2em' }, '金额: ' + _item.refundAmount),
          // ]),
          _c('p', { style: 'margin-button: 15px;' }, [
            _c('span', null, '您是否'),
            _c('i', { style: 'color: #3598dc; font-style: normal; margin: 0 5px;' }, '导出'),
            _c('span', null, '当前'),
            _c('i', { style: 'color: #cb5a5e; font-style: normal; margin: 0 5px;' }, '待发货'),
            _c('span', null, '订单信息?'),
          ]),
        ]),
      }).then(action => {
        this.selectForm.ordersState = 1;
        this._getData();
        var _downSrc = this.baseUrl + '/orders/export/exportOrdersDelivery?';
        _downSrc = _downSrc + 'token=' + this.token;
        _downSrc = _downSrc + '&download=1';
        _downSrc = _downSrc + '&exportType=1';
        if (this.selectDate != null) {
          _downSrc = _downSrc + '&startTime=' + this.selectForm.startTime;
          _downSrc = _downSrc + '&endTime=' + this.selectForm.endTime;
        }
        if (this.selectForm.acceptPhone != '') {
          _downSrc = _downSrc + '&phone=' + this.selectForm.acceptPhone;
        }
        if (this.selectForm.totalOrderNo != '') {
          _downSrc = _downSrc + '&ordersNo=' + this.selectForm.totalOrderNo;
        }
        if (this.selectForm.proxyName != '') {
          _downSrc = _downSrc + '&proxyName=' + this.selectForm.proxyName;
        }
        window.open(_downSrc);
      }).catch(() => {
//              this.$message({ type: 'info', message: '已取消操作' });
      });