小程序订单页面下拉刷新和上拉加载

/**
   * 页面的初始数据
   */
  data: {
    orderslist: [], 
    page: 0,
    totalPage: 0,
    
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    let data={
      _ajax:1
    }
    this.getListData(data);
  },
/**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {
    let data = {
      _ajax: 1,
      wechat_openid: wechat_openid
    };
    this.setData({
      orderslist: []//清空数据
    });
    this.getListData(data);//获取数据
    //
    setTimeout(()=>{
      wx.stopPullDownRefresh();
      wx.hideLoading();
    },2000);
  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {
    console.log(3333333);
    let data = {
      _ajax: 1,
      wechat_openid: wechat_openid,
      page: this.data.page + 1,
    };
    this.getListData(data);
  },

//获取数据方法开始
getListData(data) {
    
    console.log("data.page", data.page);
    console.log("data.totalPage", this.data.totalPage);
    if (data.page > this.data.totalPage) {
      wx.showToast({
        title: '无新内容'
      });                               
      return false;
    }
    wx.showLoading({ title: '加载中！' });
    let orderslist = this.data.orderslist;
    for(let i= 0;i<10;i++){
      let data = {
        "order": i + orderslist.length,
          "state":"未发货",
"imgUrl":"http://wx1.sinaimg.cn/mw690/0071poYXly1fn6wez5vjxj303w03wdfn.jpg",
              "name":"辛辛熊婴儿纸尿裤试用装S码",
                "price":"9.90",//单价
                  "sum":"1",
                    "prices":"9.90"//合计
      };
      orderslist.push(data);
    }
    this.setData({
      orderslist: orderslist,
      page: this.data.page+1,
      totalPage:3
    })
    wx.hideLoading();