微信小程序实现跟随菜单效果和循环嵌套加载数据

//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" 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="/UploadFiles/2021-04-02/{{item.src}}">

js


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
    })
 },
})




wxss


page{border-top:1px solid #f6f6f6;}

.left{
 height:100%;
 width: 19%;
 display: inline-block;
 background:#fff;
 text-align:center;
 border-right:1px solid #eee;
 }
.leftlist{
 font-size:12px;
 padding:10px;
 }

.right{
 height:100%;
 width: 80%;
 display: inline-block;
 background:#fff;
 text-align:center;
 }

.line{
 width:15px;
 height:1px;
 background:#ddd;
 display:inline-block;
 vertical-align:super;
 margin:0 15px;
}

.li{ 
 height:10%;
 width:30%;
 display:inline-block;
 text-align:center;
}

.li image{width:60px;height:60px;}

.li .name{
 font-size:12px;
 display:block;
 color:#888;
 overflow:hidden;
 white-space:nowrap;
 text-overflow:ellipsis;
}

.title{padding:20px 0;}
.yes{color: #f99;font-size: 14px;}



友情提示： 


1、左侧点击样式改变： 


利用自身index与点击的元素的index比较。 

data-i=“{{获取当前index传给_click保存}}”， 

class=”leftlist {{index==_click?'yes':”}}”， 

此处index是自身的，如果自身和点击的一致就添加，yes类名，否侧滞空清除yes样式。
2、点击左侧，右侧跟随： 


利用scroll-into-view=”{{id}}”， 视图会滚动到id为此id的view标签。我是直接从data数据里取得id，也可以直接获取点击元素id。
3、循环嵌套：data数据格式写对，按照官方文档就行。