微信小程序实现左右联动

<scroll-view class='aside' scroll-y='true' style='height:{{asideheight}}px' scroll-with-animation="true" scroll-top='{{itemLeftToTop}}'  >
    
    <view  wx:for="{{menus}}" wx:key="id"  data-id="{{item.id}}" bindtap='tabMenu' class="{{item.id === currentLeftSelected ? 'menu active' : 'menu'}}">

    <view id="{{item.id}}">{{item.name}}</view>
    </view>

    <view class="option" >
    <button id='user_btn' bindtap='getin' >个</button>
    <image id='user_img' src='../../images/index/user_option.png'></image>
    </view>
    
  </scroll-view>
  <!--每一类菜品的具体信息，可进行按钮添加每个菜品的数量-->
  
  <scroll-view class="item-content" scroll-y='true' scroll-into-view="{{itemScrollId}}" scroll-with-animation='true' style='height:{{asideheight}}px'  bindscroll="right" >
    <view wx:for="{{menus}}" wx:for-index="parentIndex" wx:key="id" id="{{item.id}}" >
    <view class="item_title">{{item.name}}</view>
    <view class="{{orderCount.num === 0 ? 'box' : 'box active'}}">
      <view class="item" wx:for="{{item.categroy}}" wx:key="categroyid" data-parentIndex='{{parentIndex}}' data-index='{{index}}'>
        <image  src="{{item.url}}"></image>
        <text class="title">{{item.categroy_name}}</text>
        <text class="price">￥ {{item.price}} 元</text>
        <view class="opera">
          <text class="btn_price " bindtap='del' data-id="{{item.id}}"  data-parentIndex='{{parentIndex}}' data-index='{{index}}'>-</text>
          <text class="num">{{item.num}}</text>
          <text class="btn_price" bindtap="add" data-id="{{item.id}}"  data-parentIndex='{{parentIndex}}' data-index="{{index}}">+</text>
        </view>    
      </view>
    </view>
    
    </view>
</scroll-view>

wx.getSystemInfo({
      success: function (res) {
        var asideheight = res.windowHeight
        var asideheight1=0;
        that.setData({
          asideheight: asideheight,
          asideheight1:asideheight+80
        })
      },
      fail: () => { console.log("无法获取显示器高度，请检查网络连接") }
    });

const RIGHT_BAR_HEIGHT = 41;
// 右侧每个子类的高度（固定）
const RIGHT_ITEM_HEIGHT = 122;
// 左侧每个类的高度（固定）
const LEFT_ITEM_HEIGHT = 41;

tabMenu: function (e) {
    this.setData({
      currentLeftSelected: e.target.id || e.target.dataset.id,
      itemScrollId: e.target.id || e.target.dataset.id 
    });
    console.log(e);
  },

get_eachItemToTop: function () {
    var obj = {};
    var totop = 0;
    var menus_ex = {};
    var that = this;
    menus_ex= that.data.menus;
    console.log(menus_ex);
    for(let i=1;i<menus_ex.length;i++){
      totop += (RIGHT_BAR_HEIGHT + menus_ex[i - 1].categroy.length * RIGHT_ITEM_HEIGHT);
      obj[menus_ex[i] ? menus_ex[i].id : 'last'] = totop;  
    }
    return obj;
  },
  
  right: function (e) {
      for (let i = 0; i < this.data.menus.length; i++) {
       let left = this.data.eachrightScrollToTop[this.data.menus[i].id]
       let right = this.data.eachrightScrollToTop[this.data.menus[i + 1] ? this.data.menus[i + 1].id : 'last']
       if (e.detail.scrollTop < right && e.detail.scrollTop >= left) {
       this.setData({
         currentLeftSelected: this.data.menus[i].id,
         itemLeftToTop: LEFT_ITEM_HEIGHT * i
            })
          }
        }
   
    },