小程序返回上一页后刷新

经过测试，onshow在onload之后。

在首次进入时，list中为空，在onshow中直接跳过。

在返回上一页时，list中数据是不为空的，则需要执行onshow中的方法。

  onShow: function () {
    var that = this;
    console.log("show",that.data.list.length);
    if(that.data.list.length>0){
      that.setData({
        openid: app.globalData.openid,
        root: app.globalData.root,
        pageIndex:1
      })
      that.query(that.data.openid, that.data.pageIndex, that.data.pageSize, that.data.activeIndex,true)
    }
  },

onLoad: function (options) {
    var that = this;
    that.setData({
      openid: app.globalData.openid,
      root: app.globalData.root
    })
    that.query(that.data.openid, that.data.pageIndex, that.data.pageSize, that.data.activeIndex,false)
  },
  query: function (openid, index, size, type,isRefesh) {
    var that = this;
    var end;
    console.log("type:"+type);
    if (type == 0) {
      end = that.data.isEnd;
    } else {
      end = that.data.isEnd1;
    }
    var isid = that.data.activeIndex;
    type = parseInt(type);
    wx.showNavigationBarLoading()
    if (end == false) {
      wx.showLoading({
        title: '正在加载中',
      })
      wx.request({
        url: app.globalData.root + "service/WeChatParent.asmx/GetMessageList",
        data: {
          openid: openid,
          type: type + 1,
          pageIndex: index,
          pageSize: size,
          key: '',
          stime: '',
          etime: ''
        },
        method: 'post',
        success: function (datas) {
          var resuJson = JSON.parse(datas.data.d);
          console.log(resuJson);
          if (resuJson.list.length == 0 ) {
            that.setData({
              dataNull: true
            })
          } else {
            that.setData({
              dataNull: false
            })
          }
          if (resuJson.end == true) {
            if (type == 0) {
              that.setData({
                isEnd: true
              })
            } else {
              that.setData({
                isEnd1: true
              })
            }
          }
          if (isid == 0) {//话机留言
              if(isRefesh){
                that.setData({
                  list: resuJson.list,
                  pageIndex: 1,
                })
              }else{
                that.setData({
                  list: that.data.list.concat(resuJson.list),
                  pageIndex: that.data.pageIndex + 1,
                })
              }
          

          } else {
            that.setData({
              list1: that.data.list1.concat(resuJson.list),
              pageIndex1: that.data.pageIndex1 + 1,
            })

          }
          wx.hideLoading()
        }
      })
    } else {
      wx.showToast({
        title: '没有更多数据了'
      })
    }
    wx.hideNavigationBarLoading()
  },