微信小程序实现跟随菜单效果和循环嵌套加载数

//使用循环嵌套data数据格式写对即可
<scroll-view class="left" scroll-y>  
  <view wx:for="{{left}}" class="leftlist {{index==_click?'yes':''}}" data-i="{{index}}" bindtap="tap">
   {{item.txt}}
  </view>
 </scroll-view>

<scroll-view class="right" scroll-y bindscroll="scroll" scroll-into-view="{{toView}}">
  <view id="{{item.id}}" wx:for="{{right}}">

   <view class="title">
    <text class="line"></text>
    {{item.txt}}
    <text class="line"></text>
   </view> 

   <view class="li" wx:for="{{item.li}}">
    <image src="{{item.src}}"></image>
    <text class="name">{{item.name}}</text>
   </view>

  </view>
 </scroll-view>

Page({
 data: {
  toView: 'red1',
  _click:0,
  left: [{ txt: '新品', id: 'new' }, { txt: '手机', id: 'phone' }, { txt: '电视', id: 'mv' }, { txt: '电脑', id: 'computer' }],
  right: [
   { txt: '新品', id: 'new',li: [{ src: '../../assets/images/max1.jpg', name: '小米noto' }, { src: '../../assets/images/max1.jpg', name: '小米mix' }, { src: '../../assets/images/max3.jpg', name: '小米5c' }, { src: '../../assets/images/max2.jpg', name: '小米notp' }, { src: '../../assets/images/max2.jpg', name: '小米note5' }, { src: '../../assets/images/max2.jpg', name: '小米6' }]}, 
   { txt: '手机', id: 'phone',li: [{ src: '../../assets/images/max2.jpg', name: '小米6s' }, { src: '../../assets/images/max3.jpg', name: '小米max' }, { src: '../../assets/images/max2.jpg', name: '小米5s' }, { src: '../../assets/images/max1.jpg', name: '小米li' }, { src: '../../assets/images/max3.jpg', name: '小米4' }, { src: '../../assets/images/max1.jpg', name: '小米max' }]}, 
   { txt: '电视', id: 'mv', li: [{ src: '../../assets/images/max3.jpg', name: '小米6' }, { src: '../../assets/images/max2.jpg', name: '小米mix' }, { src: '../../assets/images/max1.jpg', name: '小米7s' }, { src: '../../assets/images/max3.jpg', name: '小米2' }, { src: '../../assets/images/max1.jpg', name: '小米note7' }, { src: '../../assets/images/max3.jpg', name: '小米8' }] }, 
   { txt: '电脑', id: 'computer', li: [{ src: '../../assets/images/max1.jpg', name: '小米2' }, { src: '../../assets/images/max1.jpg', name: '小米mix' }, { src: '../../assets/images/max2.jpg', name: '小米max' }, { src: '../../assets/images/max1.jpg', name: '小米6' }, { src: '../../assets/images/max3.jpg', name: '小米note' }, { src: '../../assets/images/max1.jpg', name: '小米max' }] }]
 },

 scroll: function (e) {
  console.log(e)//右侧列表滑动-左侧列表名称样式跟着改变，然而我不会写，搁置中，谁会告诉我，谢谢！
 },
 tap: function (e) { 
  var j = parseInt(e.currentTarget.dataset.i);
  this.setData({
   toView: this.data.left[j].id,//控制视图滚动到为此id的<view>
   _click:j           //控制左侧点击后样式
    })
 },
})