05.智慧商城——路由前置守卫、首页动态渲染

01. 登录访问拦截 - 路由前置守卫

目标：基于全局前置守卫，进行页面访问拦截处理

说明：智慧商城项目，大部分页面，游客都可以直接访问, 如遇到需要登录才能进行的操作，提示并跳转到登录

但是：对于支付页，订单页等，必须是登录的用户才能访问的，游客不能进入该页面，需要做拦截处理

路由导航守卫 - 全局前置守卫

1.所有的路由一旦被匹配到，都会先经过全局前置守卫

2.只有全局前置守卫放行，才会真正解析渲染组件，才能看到页面内容
router/index.js

router.beforeEach((to, from, next) => {
  // 1. to   往哪里去， 到哪去的路由信息对象  
  // 2. from 从哪里来， 从哪来的路由信息对象
  // 3. next() 是否放行
  //    如果next()调用，就是放行
  //    next(路径) 拦截后到某个路径页面
})
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const authUrl = ['/pay', '/myorder']
router.beforeEach((to, from, next) => {
  const token = store.getters.token
  if (!authUrl.includes(to.path)) {
    next()
    return
  }

  if (token) {
    next()
  } else {
    next('/login')
  }
})
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02. 首页 - 静态结构准备

1. 静态结构和样式 layout/home.vue

<template>
  <div class="home">
    
    <van-nav-bar title="智慧商城" fixed />

    
    <van-search
      readonly
      shape="round"
      background="#f1f1f2"
      placeholder="请在此输入搜索关键词"
      @click="$router.push('/search')"
    />

    
    <van-swipe class="my-swipe" :autoplay="3000" indicator-color="white">
      <van-swipe-item>
        <img src="@/assets/banner1.jpg" alt="">
      van-swipe-item>
      <van-swipe-item>
        <img src="@/assets/banner2.jpg" alt="">
      van-swipe-item>
      <van-swipe-item>
        <img src="@/assets/banner3.jpg" alt="">
      van-swipe-item>
    van-swipe>

    
    <van-grid column-num="5" icon-size="40">
      <van-grid-item
        v-for="item in 10" :key="item"
        icon="http://cba.itlike.com/public/uploads/10001/20230320/58a7c1f62df4cb1eb47fe83ff0e566e6.png"
        text="新品首发"
        @click="$router.push('/category')"
      />
    van-grid>

    
    <div class="main">
      <img src="@/assets/main.png" alt="">
    div>

    
    <div class="guess">
      <p class="guess-title">—— 猜你喜欢 ——p>

      <div class="goods-list">
        <GoodsItem v-for="item in 10" :key="item">GoodsItem>
      div>
    div>
  div>
template>

<script>
import GoodsItem from '@/components/GoodsItem.vue'
export default {
  name: 'HomePage',
  components: {
    GoodsItem
  }
}
script>

<style lang="less" scoped>
// 主题 padding
.home {
  padding-top: 100px;
  padding-bottom: 50px;
}

// 导航条样式定制
.van-nav-bar {
  z-index: 999;
  background-color: #c21401;
  ::v-deep .van-nav-bar__title {
    color: #fff;
  }
}

// 搜索框样式定制
.van-search {
  position: fixed;
  width: 100%;
  top: 46px;
  z-index: 999;
}

// 分类导航部分
.my-swipe .van-swipe-item {
  height: 185px;
  color: #fff;
  font-size: 20px;
  text-align: center;
  background-color: #39a9ed;
}
.my-swipe .van-swipe-item img {
  width: 100%;
  height: 185px;
}

// 主会场
.main img {
  display: block;
  width: 100%;
}

// 猜你喜欢
.guess .guess-title {
  height: 40px;
  line-height: 40px;
  text-align: center;
}

// 商品样式
.goods-list {
  background-color: #f6f6f6;
}
style>
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2. 新建components/GoodsItem.vue

<template>
  <div class="goods-item" @click="$router.push('/prodetail')">
    <div class="left">
      <img src="@/assets/product.jpg" alt="" />
    div>
    <div class="right">
      <p class="tit text-ellipsis-2">
        三星手机 SAMSUNG Galaxy S23 8GB+256GB 超视觉夜拍系统 超清夜景 悠雾紫
        5G手机 游戏拍照旗舰机s23
      p>
      <p class="count">已售104件p>
      <p class="price">
        <span class="new">¥3999.00span>
        <span class="old">¥6699.00span>
      p>
    div>
  div>
template>

<script>
export default {}
script>

<style lang="less" scoped>
.goods-item {
  height: 148px;
  margin-bottom: 6px;
  padding: 10px;
  background-color: #fff;
  display: flex;
  .left {
    width: 127px;
    img {
      display: block;
      width: 100%;
    }
  }
  .right {
    flex: 1;
    font-size: 14px;
    line-height: 1.3;
    padding: 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;

    .count {
      color: #999;
      font-size: 12px;
    }
    .price {
      color: #999;
      font-size: 16px;
      .new {
        color: #f03c3c;
        margin-right: 10px;
      }
      .old {
        text-decoration: line-through;
        font-size: 12px;
      }
    }
  }
}
style>

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3. 组件按需引入

import { Search, Swipe, SwipeItem, Grid, GridItem } from 'vant'

Vue.use(GridItem)
Vue.use(Search)
Vue.use(Swipe)
Vue.use(SwipeItem)
Vue.use(Grid)
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25. 首页 - 动态渲染

1. 封装准备接口 api/home.js

import request from '@/utils/request'

// 获取首页数据
export const getHomeData = () => {
  return request.get('/page/detail', {
    params: {
      pageId: 0
    }
  })
}
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2. 页面中请求调用

import GoodsItem from '@/components/GoodsItem.vue'
import { getHomeData } from '@/api/home'
export default {
  name: 'HomePage',
  components: {
    GoodsItem
  },
  data () {
    return {
      bannerList: [],
      navList: [],
      proList: []
    }
  },
  async created () {
    const { data: { pageData } } = await getHomeData()
    this.bannerList = pageData.items[1].data
    this.navList = pageData.items[3].data
    this.proList = pageData.items[6].data
  }
}
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3. 轮播图、导航、猜你喜欢渲染

<van-swipe class="my-swipe" :autoplay="3000" indicator-color="white">
  <van-swipe-item v-for="item in bannerList" :key="item.imgUrl">
    <img :src="item.imgUrl" alt="">
  van-swipe-item>
van-swipe>


<van-grid column-num="5" icon-size="40">
  <van-grid-item
    v-for="item in navList" :key="item.imgUrl"
    :icon="item.imgUrl"
    :text="item.text"
    @click="$router.push('/category')"
  />
van-grid>
    

<div class="guess">
  <p class="guess-title">—— 猜你喜欢 ——p>

  <div class="goods-list">
    <GoodsItem v-for="item in proList"  :item="item" :key="item.goods_id">GoodsItem>
  div>
div>
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4. 商品组件内，动态渲染

<template>
  <div v-if="item.goods_name" class="goods-item" @click="$router.push(`/prodetail/${item.goods_id}`)">
    <div class="left">
      <img :src="item.goods_image" alt="" />
    div>
    <div class="right">
      <p class="tit text-ellipsis-2">
        {{ item.goods_name }}
      p>
      <p class="count">已售 {{ item.goods_sales }}件p>
      <p class="price">
        <span class="new">¥{{ item.goods_price_min }}span>
        <span class="old">¥{{ item.goods_price_max }}span>
      p>
    div>
  div>
template>

<script>
export default {
  props: {
    item: {
      type: Object,
      default: () => {
        return {}
      }
    }
  }
}
script>
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