//模拟json数据
 var categoryJson=[
 {
 id: 'guowei',
 name: '果味',
 isChild: true,
 children: [
 {
  child_id: 1,
  name: "果味"
 }
 ]
 },
 {
 id: 'shucai',
 name: '蔬菜',
 isChild: true,
 children: [
 {
  child_id: 1,
  name: "蔬菜"
 }
 ]
 },
 {
 id: 'chaohuo',
 name: '炒货',
 isChild: true,
 children: [
 {
  child_id: 1,
  name: "炒货"
 }
 ]
 },
 {
 id: 'dianxin',
 name: '点心',
 isChild: true,
 children: [
 {
  child_id: 1,
  name: "点心"
 }
 ]
 },
 {
 id: 'ganguo',
 name: '干果',
 isChild: false,
 children: []
 },
 {
 id: 'clothes',
 name: '衣服',
 isChild: false,
 children: []
 },
 {
 id: 'bag',
 name: '包包',
 isChild: false,
 children: []
 },
 {
 id: 'woman',
 name: '女鞋',
 isChild: false,
 children: []
 },
 {
 id: 'mansport',
 name: '男鞋',
 isChild: false,
 children: []
 },
 {
 id: 'sports',
 name: '运动鞋',
 isChild: false,
 children: []
 },
 {
 id: 'hzp',
 name: '化妆品',
 isChild: false,
 children: []
 },
 {
 id: 'life',
 name: '日常用品',
 isChild: false,
 children: []
 },
 {
 id: 'computer',
 name: '电脑',
 isChild: false,
 children: []
 },
 {
 id: 'phone',
 name: '手机',
 isChild: false,
 children: []
 }
 ]
 //导出数据
 module.exports={
 dataList:categoryJson
 }

<view class="main">
 <view class="categroy-left">
 <!-- 当前项的id等于item项的id或者当前的下标等于item的下标时，那个就是当前状态- -->
 <view wx:for="{{category}}" wx:key="index" data-id="{{item.id}}" data-index="{{index}}"
  bindtap="switchTab"
  class="cate-list {{curIndex === index">{{item.name}}</view>
 </view>
 <scroll-view class="categroy-right" scroll-y="{{}}" scroll-into-view="{{toView}}" scroll-with-animation="true">
 <view wx:if="{{category[curIndex].isChild}}">
 <block wx:for="{{category[curIndex].children}}" wx:for-index wx:key="idx">
  <view id="{{item.id}}" class="cate-box">
  <view class="cate-title">
  <text>{{item.name}}</text>
  </view>
  </view>
 </block> 
 </view>
 <!-- 若无数据，则显示暂无数据 -->
 <view class='nodata' wx:else>该分类暂无数据</view>
 </scroll-view>
</view>

//引入本地的json数据
var jsonData=require("../../data/categroryData.js")
Page({
 data: {
 curIndex: 0,
 toView: 'guowei'
 },
 onLoad(){
 this.setData({
 //jsonData.dataList获取data文件中categoryData.js中定义的Json数据，并赋值给category
 category: jsonData.dataList
 })
 },
 switchTab(e){
 //将获取到的item的id和数组的下表值设为当前的id和下标
 this.setData({
 toView: e.target.dataset.id,
 curIndex: e.target.dataset.index
 })
 } 
})

 .main{
 width:100%;
 height: 100%;
 }
 .categroy-left{
 float: left;
 width: 150rpx;
 height: 100%;
 overflow-y: auto;
 border-right: 1px solid #ddd;
 box-sizing: border-box;
 }
 .categroy-left .cate-list{
 height: 90rpx;
 line-height: 90rpx;
 text-align: center;
 border-left: 3px solid #fff;
 }
 .categroy-left .cate-list.active{
 color: #AB956D;
 border-color: #AB956D;
 }
 .categroy-right{
 float: right;
 width: 600rpx;
 height: 100%;
 }
 .cate-box{
 height: 100%;
 padding:40rpx;
 box-sizing: border-box;
 }
 .cate-title{
 position: relative;
 height: 30rpx;
 line-height: 30rpx;
 padding:30rpx 0 55rpx;
 text-align: center;
 color: #AB956D;
 font-size: 28rpx;
 }
 .cate-title::before{
 position: absolute;
 left: 130rpx;
 top: 43rpx;
 content: '';
 width: 70rpx;
 height: 4rpx;
 background: #AB956D;
 }
 .cate-title::after{
 position: absolute;
 right: 130rpx;
 top: 43rpx;
 content: '';
 width: 70rpx;
 height: 4rpx;
 background: #AB956D;
 }
 
 .nodata{
 font-size: 14px;
 text-align: center;
 color: #AB956D;
 margin-top: 100px;
 }