11.Layout-Pinia优化重复请求

如何优化

先渲染一下结构：

<script setup>
//vueUse
 import {getCategoryAPI} from '@/api/category'
import {onMounted,ref} from 'vue'
import {useScroll} from '@vueuse/core'

const categoryList = ref([])
const getCategoryAPI = async() => {
  const res = await getCategoryAPI() 
  categoryList.value = res.result
}

onMounted(() =>{ 
  getCategoryAPI()
})

  const {y} = useScroll(window)
</script>

<template>
  <div class="app-header-sticky">
    <div class="container">
      <RouterLink class="logo" to="/" />
      <!-- 导航区域 -->
      <ul class="app-header-nav ">
        <li class="home">
          <RouterLink to="/">首页</RouterLink>
        </li>
        <li>
           <li class="home" v-for="item in categoryList>
           <RouterLink to ="/">{{item.name}}</RouterLink>
       </li>
      </ul>

      <div class="right">
        <RouterLink to="/">品牌</RouterLink>
        <RouterLink to="/">专题</RouterLink>
      </div>
    </div>
  </div>
</template>


<style scoped lang='scss'>
.app-header-sticky {
  width: 100%;
  height: 80px;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 999;
  background-color: #fff;
  border-bottom: 1px solid #e4e4e4;
  // 此处为关键样式!!!
  // 状态一：往上平移自身高度 + 完全透明
  transform: translateY(-100%);
  opacity: 0;

  // 状态二：移除平移 + 完全不透明
  &.show {
    transition: all 0.3s linear;
    transform: none;
    opacity: 1;
  }

  .container {
    display: flex;
    align-items: center;
  }

  .logo {
    width: 200px;
    height: 80px;
    background: url("@/assets/images/logo.png") no-repeat right 2px;
    background-size: 160px auto;
  }

  .right {
    width: 220px;
    display: flex;
    text-align: center;
    padding-left: 40px;
    border-left: 2px solid $xtxColor;

    a {
      width: 38px;
      margin-right: 40px;
      font-size: 16px;
      line-height: 1;

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

.app-header-nav {
  width: 820px;
  display: flex;
  padding-left: 40px;
  position: relative;
  z-index: 998;

  li {
    margin-right: 40px;
    width: 38px;
    text-align: center;

    a {
      font-size: 16px;
      line-height: 32px;
      height: 32px;
      display: inline-block;

      &:hover {
        color: $xtxColor;
        border-bottom: 1px solid $xtxColor;
      }
    }

    .active {
      color: $xtxColor;
      border-bottom: 1px solid $xtxColor;
    }
  }
}
</style>

import { ref } from 'vue'
import { defineStore } from 'pinia'
import { getCategoryAPI } from '@/apis/layout'
export const useCategoryStore = defineStore('category', () => {
  // 导航列表的数据管理
  // state 导航列表数据
  const categoryList = ref([])

  // action 获取导航数据的方法
  const getCategory = async () => {
    const res = await getCategoryAPI()
    categoryList.value = res.result
  }

  return {
    categoryList,
    getCategory
  }
})

然后这些东西都可以不要了

再重新优化

<script setup>
import {useScroll} from '@vueuse/core'
import{useCategoryStore} from '@/stores/category'
const {y} = useScroll(window)

// 使用pinia中的数据
const categoryStore = useCategoryStore()
</script>

<template>
  <div class="app-header-sticky">
    <div class="container">
      <RouterLink class="logo" to="/" />
      <!-- 导航区域 -->
      <ul class="app-header-nav ">
        <li class="home">
          <RouterLink to="/">首页</RouterLink>
        </li>
        <li>
           <li class="home" v-for="item in categoryStore.categoryList>
           <RouterLink to ="/">{{item.name}}</RouterLink>
       </li>
      </ul>

      <div class="right">
        <RouterLink to="/">品牌</RouterLink>
        <RouterLink to="/">专题</RouterLink>
      </div>
    </div>
  </div>
</template>


<style scoped lang='scss'>
.app-header-sticky {
  width: 100%;
  height: 80px;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 999;
  background-color: #fff;
  border-bottom: 1px solid #e4e4e4;
  // 此处为关键样式!!!
  // 状态一：往上平移自身高度 + 完全透明
  transform: translateY(-100%);
  opacity: 0;

  // 状态二：移除平移 + 完全不透明
  &.show {
    transition: all 0.3s linear;
    transform: none;
    opacity: 1;
  }

  .container {
    display: flex;
    align-items: center;
  }

  .logo {
    width: 200px;
    height: 80px;
    background: url("@/assets/images/logo.png") no-repeat right 2px;
    background-size: 160px auto;
  }

  .right {
    width: 220px;
    display: flex;
    text-align: center;
    padding-left: 40px;
    border-left: 2px solid $xtxColor;

    a {
      width: 38px;
      margin-right: 40px;
      font-size: 16px;
      line-height: 1;

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

.app-header-nav {
  width: 820px;
  display: flex;
  padding-left: 40px;
  position: relative;
  z-index: 998;

  li {
    margin-right: 40px;
    width: 38px;
    text-align: center;

    a {
      font-size: 16px;
      line-height: 32px;
      height: 32px;
      display: inline-block;

      &:hover {
        color: $xtxColor;
        border-bottom: 1px solid $xtxColor;
      }
    }

    .active {
      color: $xtxColor;
      border-bottom: 1px solid $xtxColor;
    }
  }
}
</style>

同理LayoutHeader.vue也一样，把共同 的部分封装在stores里面，所以可以删除掉那些东西

<script setup>
import{useCategoryStore} from '@/stores/category'
const categoryStore = useCategoryStore()
</script>

  // 3。v-for渲染数据
<template>
  <header class='app-header'>
    <div class="container">
      <h1 class="logo">
        <RouterLink to="/">小兔鲜</RouterLink>
      </h1>
      <ul class="app-header-nav">
        <li class="home">
          <RouterLink to="/">首页</RouterLink>
        </li>
        <li class="home" v-for="item in categoryStore.categoryList" :key="item.id">
           <RouterLink to ="/">{{item.name}}</RouterLink>
       </li>
      </ul>
      <div class="search">
        <i class="iconfont icon-search"></i>
        <input type="text" placeholder="搜一搜">
      </div>
      <!-- 头部购物车 -->
      
    </div>
  </header>
</template>


<style scoped lang='scss'>
.app-header {
  background: #fff;

  .container {
    display: flex;
    align-items: center;
  }

  .logo {
    width: 200px;

    a {
      display: block;
      height: 132px;
      width: 100%;
      text-indent: -9999px;
      background: url('@/assets/images/logo.png') no-repeat center 18px / contain;
    }
  }

  .app-header-nav {
    width: 820px;
    display: flex;
    padding-left: 40px;
    position: relative;
    z-index: 998;
  
    li {
      margin-right: 40px;
      width: 38px;
      text-align: center;
  
      a {
        font-size: 16px;
        line-height: 32px;
        height: 32px;
        display: inline-block;
  
        &:hover {
          color: $xtxColor;
          border-bottom: 1px solid $xtxColor;
        }
      }
  
      .active {
        color: $xtxColor;
        border-bottom: 1px solid $xtxColor;
      }
    }
  }

  .search {
    width: 170px;
    height: 32px;
    position: relative;
    border-bottom: 1px solid #e7e7e7;
    line-height: 32px;

    .icon-search {
      font-size: 18px;
      margin-left: 5px;
    }

    input {
      width: 140px;
      padding-left: 5px;
      color: #666;
    }
  }

  .cart {
    width: 50px;

    .curr {
      height: 32px;
      line-height: 32px;
      text-align: center;
      position: relative;
      display: block;

      .icon-cart {
        font-size: 22px;
      }

      em {
        font-style: normal;
        position: absolute;
        right: 0;
        top: 0;
        padding: 1px 6px;
        line-height: 1;
        background: $helpColor;
        color: #fff;
        font-size: 12px;
        border-radius: 10px;
        font-family: Arial;
      }
    }
  }
}
</style>

就剩一次请求了，完美