uni-app

// template是放置视图部分的
<template>
    <view>
      
    </view>
</template>

// script 放置方法、数据、功能
<script>
    export default {
        data() {
            return {
            //    wh: 10,
        cateList: [],  // 遍历数组后需要先创建数据接收
        cateLevel2: [],
        active: 0,
        scrollTop: 0
            };
        },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.hw = sysInfo.windowHeight
      this.getCateList()
    },
        methods: {
            async getCateList() {
        const { data:res } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 1:0
      },
      gotoGoodsList(item3){
        uni.navigateTo({
          // 点击三级分类项跳转到商品列表页面
          url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      }
    }
    }
</script>

// style放置样式
<style lang="scss">
  .scroll-view-container {
    display: flex;
  
    .left-scroll-view {
      width: 120px;
  
      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;
  
        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;
  
          // 渲染激活项左侧的红色指示边线
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
  .cate-lv2-title{
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    
    .cate-lv3-item{
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      
      image{
        width: 60px;
        height: 60px;
      }
      
      text {
        font-size: 12px;
      }
    }
  }
</style>