let pages = getCurrentPages();

    let prevPage = pages[pages.length - 2];

    prevPage.setData({

      flag: 2,

      rentCarShow: true,

      step: 1

    })

    wx.navigateBack({

      delta: 1 // 返回上一级页面。

    })

 if (that.data.flag == 2) {

      console.log('------------------------------');

      that.setData({

        rentCarShow: true

      })

      console.log(that.data.rentCarShow);

      // 获取租车开锁结果

      // that.getVehicleOpenResult();

    }