<!--WXML--><view id="box">  <view class="list" wx:for="{{List}}" wx:key="List{{index}}">    <image mode='aspectFill' class='list_img' src="{{item.imgUrl}}" ></image>  </view></view>

  /* JS */ // 封裝函數(shù)獲取ID為box的元素實際高度  getScrollHeight: function() {  wx.createSelectorQuery().select('#box').boundingClientRect((rect) => {   this.setData({    scrollHeight: rect.height   })   console.log(this.data.scrollHeight)  }).exec() }, // 假設(shè)數(shù)據(jù)請求 getDataList: function() {  wx.request({   url: 'test.php', //僅為示例，并非真實的接口地址   success: function(res) {   // 如果該元素下面的數(shù)據(jù)是動態(tài)獲取的，此方法在wx.request請求成功的回調(diào)函數(shù)中調(diào)用    this.getScrollHeight()   }  }) },

  //監(jiān)聽用戶滑動頁面事件 onPageScroll: function(e) {    if (e.scrollTop <= 0) {   // 滾動到最頂部   e.scrollTop = 0;  } else if (e.scrollTop > this.data.scrollHeight) {   // 滾動到最底部   e.scrollTop = this.data.scrollHeight;  }  if (e.scrollTop > this.data.scrollTop || e.scrollTop >= this.data.scrollHeight) {   //向下滾動    console.log('向下 ', this.data.scrollHeight)  } else {   //向上滾動    console.log('向上滾動 ', this.data.scrollHeight)  }  //給scrollTop重新賦值   this.setData({   scrollTop: e.scrollTop  }) },

<scroll-view><view>Some of the words<view><view bindscroll="scroll" class="{{variable>200 ? 'class1' : 'class2'}}"</view></scroll-view>

//JS文件 //滾動監(jiān)聽 scroll: function (e) { this.setData({  scrollTop:e.detail.scrollTop }) }