let list = this.data.list;
    let tabHeight = 0;
      if (this.data.load) {
        for (let i = 0; i < list.length; i++) {
          let view = wx.createSelectorQuery().select("#main-" + i);//正常写法
          //子组件写法 let view = wx.createSelectorQuery().in(this).select("#main-" + i);
          view.fields({
            size: true
          }, data => {
            list[i].top = tabHeight;
            tabHeight = tabHeight + data.height;//子组件不加in(this)，wx.createSelectorQuery()获取不到height
            list[i].bottom = tabHeight;
          }).exec();
        }
        this.setData({
          load: false,
          list: list
        })
      }
      let scrollTop = e.detail.scrollTop + 20;
      for (let i = 0; i < list.length; i++) {
        if (scrollTop > list[i].top && scrollTop < list[i].bottom) {
          this.setData({
            VerticalNavTop: (i - 1) * 50,
            TabCur: i
          })
          return false
        }
      }