onPageScroll: function (e) {
    if (e.scrollTop > 100) {
      this.setData({
        floorstatus: true
      });
    } else {
      this.setData({
        floorstatus: false
      });
    }
  },
  goTop:function(){
    wx.pageScrollTo({
      scrollTop: 0,
      duration: 300
    })
  },