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4-一级分类页.md

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4-1 需求分析与路由配置

步骤1：重构router/index.js

     children:[
        {
          path: '',
          component: Home
        },
        {
          path: 'category/:id',
          component: Category
        }
      ]

步骤2：配置导航区域链接

重构Layout/LayoutHeader.vue

     <ul class="app-header-nav">
        <li class="home">
          <RouterLink to="/">首页</RouterLink>
        </li>
        <li v-for="item in categoryList" :key="item.id">
          <RouterLink :to="`/category/${item.id}`">{{item.name}}</RouterLink>
        </li>
      </ul>

步骤3：配置激活样式

<li v-for="item in categoryList" :key="item.id">
<RouterLink active-class="active" :to="`/category/${item.id}`">{{item.name}}</RouterLink>
</li>

样式

.active {
  color: $xtxColor;
  border-bottom: 1px solid $xtxColor;
}

##步骤4：重构LayoutFixed.vue

<li v-for="item in categoryList" :key="item.id">
<RouterLink active-class="active" :to="`/category/${item.id}`">{{item.name}}</RouterLink>
</li>

4-2 面包屑导航

步骤1：重构Category/index.vue

<script setup>

</script>

<template>
  <div class="top-category">
    <div class="container m-top-20">
      <!-- 面包屑 -->
      <div class="bread-container">
        <el-breadcrumb separator=">">
          <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>居家</el-breadcrumb-item>
        </el-breadcrumb>
      </div>
    </div>
  </div>
</template>


<style scoped lang="scss">
.top-category {
  h3 {
    font-size: 28px;
    color: #666;
    font-weight: normal;
    text-align: center;
    line-height: 100px;
  }

  .sub-list {
    margin-top: 20px;
    background-color: #fff;

    ul {
      display: flex;
      padding: 0 32px;
      flex-wrap: wrap;

      li {
        width: 168px;
        height: 160px;


        a {
          text-align: center;
          display: block;
          font-size: 16px;

          img {
            width: 100px;
            height: 100px;
          }

          p {
            line-height: 40px;
          }

          &:hover {
            color: $xtxColor;
          }
        }
      }
    }
  }

  .ref-goods {
    background-color: #fff;
    margin-top: 20px;
    position: relative;

    .head {
      .xtx-more {
        position: absolute;
        top: 20px;
        right: 20px;
      }

      .tag {
        text-align: center;
        color: #999;
        font-size: 20px;
        position: relative;
        top: -20px;
      }
    }

    .body {
      display: flex;
      justify-content: space-around;
      padding: 0 40px 30px;
    }
  }

  .bread-container {
    padding: 25px 0;
  }
}
</style>

步骤2：封装接口

创建apis/category.js

import http from "@/utils/http";

/**
 * @description: 根据id获得一级分类对象信息
 * @param {*} id 分类id
 * @return {*}
 */
export function getTopCategoryAPI(id){
    return http.get('/category',{params:{id}});
}

步骤3：渲染面包屑导航

<script setup>
import {getTopCategoryAPI} from '@/apis/category'
import {useRoute} from "vue-router";
import {onMounted, onUpdated, ref} from "vue";

const categoryData = ref({})
const route = useRoute()
const getCategory = async () => {
  // 如何在setup中获取路由参数 useRoute() -> route 等价于this.$route
  //console.log(route.params.id);
  const res = await getTopCategoryAPI(route.params.id)
  categoryData.value = res.result
}
onMounted(()=>getCategory())
</script>

<template>
  <div class="top-category">
    <div class="container m-top-20">
      <!-- 面包屑 -->
      <div class="bread-container">
        <el-breadcrumb separator=">">
          <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>{{ categoryData.name }}</el-breadcrumb-item>
        </el-breadcrumb>
      </div>
    </div>
  </div>
</template>

4-3 实现分类轮播图

步骤1：适配接口

修改apis/home.js

/**
 * @description: 获取轮播图
 * @param distributionSite='1' 首页 '2'表示分类页面
 * @return {*}
 */
export function getBannerAPI(distributionSite='1'){
    return http.get('/home/banner',{params:{distributionSite}});
}

步骤2：迁移首页Banner逻辑

<script setup>
...
//轮播图
const bannerList = ref([]);
const getBanner = async () => {
  const res = await getBannerAPI('2');
  bannerList.value = res.result;
}
onMounted(()=>getBanner());


</script>

<template>
  <div class="top-category">
    <div class="container m-top-20">
      <!-- 面包屑 -->
      <div class="bread-container">
        <el-breadcrumb separator=">">
          <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>{{ categoryData.name }}</el-breadcrumb-item>
        </el-breadcrumb>
      </div>
      <!-- 轮播图 -->
      <div class="home-banner">
        <el-carousel height="500px">
          <el-carousel-item v-for="item in bannerList" :key="item.id">
            <img :src="item.imgUrl" alt="">
          </el-carousel-item>
        </el-carousel>
      </div>
    </div>
  </div>
</template>


<style scoped lang="scss">
...
.home-banner {
  width: 1240px;
  height: 500px;
  margin: 0 auto;
  img {
    width: 100%;
    height: 500px;
  }
}
</style>

4-4 分类列表渲染

重构Category/index.vue

      <!-- 分类产品图片 -->
      <div class="sub-list">
        <h3>全部分类</h3>
        <ul>
          <li v-for="i in categoryData.children" :key="i.id">
            <RouterLink to="/">
              <img :src="i.picture" />
              <p>{{ i.name }}</p>
            </RouterLink>
          </li>
        </ul>
      </div>
      <!-- 分类产品列表 -->
      <div class="ref-goods" v-for="item in categoryData.children" :key="item.id">
        <div class="head">
          <h3>- {{ item.name }}-</h3>
        </div>
        <div class="body">
          <GoodsItem v-for="good in item.goods" :good="good" :key="good.id" />
        </div>
      </div>

数据结构分析

1690933993057

4-5 解决路由缓存及滚动行为

缓存问题：当路由path一样，参数不同的时候会选择直接复用路由对应的组件

解决方法

方式1：router-view添加key

方式1：给router-view添加key ,破坏复用机制，强制销毁重建

重构Layout/index.vue

<template>
  <LayoutFixed></LayoutFixed>
  <LayoutNav></LayoutNav>
  <LayoutHeader></LayoutHeader>
  <RouterView :key="$route.fullPath"/>
  <LayoutFooter></LayoutFooter>
</template>

方式2：onBeforeRouteUpdate钩子函数

方式2：使用 onBeforeRouteUpdate钩子函数，做精确更新

重构Category/index.vue

import {useRoute,onBeforeRouteUpdate} from "vue-router";
onBeforeRouteUpdate((to)=>{
  getCategory(to.params.id)
})

修改路由行为

点击新的链接，页面切换到最顶端

重构router/index.js

const router = createRouter({
...
//定制路由滚动行为
scrollBehavior(){
  return{
    top:0
  }
}

4-6 业务逻辑函数拆分

基本思想：把组件内独立的业务逻辑通过 useXXX 函数做封装处理，在组件中做组合使用

image.png

实现步骤：
1. 按照业务声明以 `use` 打头的逻辑函数
2. 把独立的业务逻辑封装到各个函数内部
3. 函数内部把组件中需要用到的数据或者方法return出去
4. 在组件中调用函数把数据或者方法组合回来使用

步骤1：创建useCategory.js

创建composables/useCategory.js

import {onBeforeRouteUpdate, useRoute} from "vue-router";
import {getTopCategoryAPI} from "@/apis/category";

export function useCategory(){
    const categoryData = ref({})
    const route = useRoute()
    const getCategory = async (id) => {
        // 如何在setup中获取路由参数 useRoute() -> route 等价于this.$route
        //console.log(route.params.id);
        const res = await getTopCategoryAPI(route.params.id)
        categoryData.value = res.result
    }
    onMounted(()=>getCategory())
    onBeforeRouteUpdate((to)=>{
        getCategory(to.params.id)
    })
    return{
        categoryData
    }
}

步骤2：创建useBanner.js

import {getBannerAPI} from "@/apis/home";

export function useBanner(){
    const bannerList = ref([])
    const getBanner = async () => {
        const res = await getBannerAPI('2')
        bannerList.value = res.result
    }
    onMounted(()=>{
        getBanner()
    })
    return {
        bannerList
    }
}

步骤3：重构index.js

<script setup>
import GoodsItem from "@/views/Home/components/GoodsItem.vue";
import {useBanner} from "@/views/Category/composables/useBanner";
import {useCategory} from "@/views/Category/composables/useCategory";


//面包屑及一级分类数据
const {categoryData} = useCategory();
//轮播图
const {bannerList} = useBanner();

</script>