小程序翻页加载数据

加载第一页留店商品数据
  firstGetGiftData: function () {
    this.setData({
      page: 1
    })
    this.getGiftData("正在加载数据");
  },
  // 下拉加载留店数据
  onReachBottom: function () {
    console.log("下拉加载");
    if (this.data.hasMoreData) {
      this.getGiftData("加载更多数据")
    }
  },
  // 获取留店商品数据
  getGiftData: function (message) {
    var that = this;
    this.setData({
      ifstore: 1
    })
    var shop = wx.getStorageSync('shop');
    var purchaseStorage = wx.getStorageSync('purchaseStorage');
    console.log("留店商品");
    util.reqAsync('shopOrder/storeRetentionList', {
      page: that.data.page,
      shopId: shop.id,
      userId: wx.getStorageSync('scSysUser').id,
      merchantId: that.data.merchantId,
      rows: that.data.rows
    }).then((res) => {
      console.log("留店商品列表")
      console.log(res);
      // 数据增加加购数量，重置加购数量
      for (let i = 0; i < res.data.data.length; i++) {
        if (!res.data.data[i]["shopNum"]) {
          res.data.data[i]["shopNum"] = 1;
          res.data.data[i]["pitch"] = 0;
        }
      }
      var purchaselistTem = that.data.purchase;
      if (that.data.page == 1) {
        purchaselistTem = [];
      }
      // debugger
      if (res.data.data.length < that.data.rows) {
        that.setData({
          purchase: purchaselistTem.concat(res.data.data),
          hasMoreData: false
        })
      }
      else {
        that.setData({
          purchase: purchaselistTem.concat(res.data.data),
          hasMoreData: true,
          page: that.data.page + 1
        })
      }
    }).catch((err) => {
      console.log(err)
    })
  },