vue.js学习(day 18)

news2025/1/11 19:39:37

实例：面经基础版

(功能)组件缓存 keep-alive

小结

main.js

import Vue from 'vue'
import App from './App.vue'
import router from './router'

Vue.config.productionTip = false

new Vue({   //注入,将路由对象注入到new Vue实例中，建立关联
  render: h => h(App),
  router
}).$mount('#app')

index.js

import Vue from 'vue'
import VueRouter from "vue-router"; //引入
// import { component } from 'vue/types/umd';
import Layout from '@/views/Layout.vue'
import ArticleDetail from '@/views/ArticleDetail.vue';
import Article from '@/views/Article.vue';
import Collect from '@/views/Collect.vue';
import Like from '@/views/Like.vue';
import User from '@/views/User.vue';
Vue.use(VueRouter) //安装注册

const router = new VueRouter({  //创建路由对象
  //创建需要的组件(view目录),配置路由规则
  routes: [
    {
      path:'/',
      // redirect:'/Layout',
      component:Layout,
      redirect:'/article',//重定向
      //通过children 配置项，可以配置嵌套子路由
      // 1.在children项配置中，配规则
      // 2. 准备二级路由出口
      children:[ 
        {
          path:'/article',
          component:Article
        },
        {
          path:'/collect',
          component:Collect
        },
        {
          path:'/like',
          component:Like
        },
        {
          path:'/user',
          component:User
        }
      ]
       
      
    },
    {
      // path:'/detail',
      // component:ArticleDetail

      
      //动态路由传参路由配置 /路径名/:参数
      path:'/detail/:id',
      component:ArticleDetail
    }
  ]
})

export default router

App.vue

<template>
  <div class="h5-wrapper">
    <!-- 包裹了keep-alive 一级路由匹配的组件都会被缓存
        Layout (被缓存) -多两个生命周期钩子
         - actived 激活时，组件被看到时触发
         - deactived 失活时，离开页面组件看不见触发 
        Detail (未被缓存)
   


        需求：只希望Layout被缓存，include配置 → :include="组件名数组"
    -->
        <!-- <keep-alive :include="['LayoutPage']"> -->
        <keep-alive :include="keepArr">
          
          <router-view></router-view>
        </keep-alive>
  </div>
</template>

<script>
export default {
  name: "h5-wrapper",
  data(){
    return {
      keepArr:['LayoutPage']
    }
  }
}
</script>

<style>
body {
  margin: 0;
  padding: 0;
}
</style>
<style lang="less" scoped>
.h5-wrapper {
  .content {
    margin-bottom: 51px;
  }
  .tabbar {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 50px;
    line-height: 50px;
    text-align: center;
    display: flex;
    background: #fff;
    border-top: 1px solid #e4e4e4;
    a {
      flex: 1;
      text-decoration: none;
      font-size: 14px;
      color: #333;
      -webkit-tap-highlight-color: transparent;
      &.router-link-active {
        color: #fa0;
      }
    }
  }
}
</style>

Layout.vue (一级路由首页)

<template>
  <div class="h5-wrapper">
    <div class="content">
      <!-- 二级路由出口,匹配到的二级路由组件就会展示 -->
      <router-view></router-view>
    </div>
    <nav class="tabbar">
      <!-- 导航高亮
            1. 将a标签，替换成router-link (to)
            2. 结合高亮类名实现高亮效果(router-link-active 模糊匹配)

      -->
      <router-link to="/article">面经</router-link>
      <router-link to="/collect">收藏</router-link>
      <router-link to="/like">喜欢</router-link>
      <router-link to="/user">我的</router-link>
    </nav>
  </div>
</template>

<script>
export default {
  // 组件名，如果没有配置 name，才会找文件名作为组件名
  name: "LayoutPage",
  //组件被缓存，就不会执行created,mounted,destroyed等钩子
  //所以提供了 activated 和 deactivated
  created(){
    console.log('组件被加载了')
  },
  mounted(){
    console.log('dom 渲染完了')

  },
  destroyed(){
    console.log('组件被销毁了')

  },

  activated(){
    alert('你好，欢迎回到首页')
    console.log('activated 组件被激活了，看到页面了')
  },
  deactivated(){
    console.log('deactivated 组件失活，离开页面了')
  }
}
</script>

<style>
body {
  margin: 0;
  padding: 0;
}
</style>
<style lang="less" scoped>
.h5-wrapper {
  .content {
    margin-bottom: 51px;
  }
  .tabbar {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 50px;
    line-height: 50px;
    text-align: center;
    display: flex;
    background: #fff;
    border-top: 1px solid #e4e4e4;
    a {
      flex: 1;
      text-decoration: none;
      font-size: 14px;
      color: #333;
      -webkit-tap-highlight-color: transparent;
    }
    a.router-link-active{
      color: aqua;
    }
  }
}
</style>

ArticleDetail.vue(一级路由详情页)

<template>
  <div class="article-detail-page" v-if="articlelist.id" >  
                                  <!-- 数据传来再做渲染 -->
    <nav class="nav"><span @click="$router.back()" class="back">&lt;</span> 面经详情</nav>
    
    <header  class="header">
      <h1>{{ articlelist.stem }}</h1>
      <p>{{ articlelist.createdAt}} | {{ articlelist.views}} 浏览量 | {{ articlelist.likeCount}} 点赞数</p>
      <p>
        <img
          :src="articlelist.creatorAvatar"
          alt=""
        />
        <span>{{ articlelist.creatorName}}</span>
      </p>
    </header>
    <main class="body">
      {{ articlelist.content }}
    </main>
  </div>
</template>

<script>
import axios from 'axios'

// 请求地址: https://mock.boxuegu.com/mock/3083/articles/:id
// 请求方式: get
export default {
  name: "ArticleDetailPage",
  
  data() {
    return {
    articlelist:{}
    
    } 
  },
  async created(){
    const res = await axios.get(`https://mock.boxuegu.com/mock/3083/articles/${this.$route.params.id}`)
    this.articlelist = res.data.result
   // console.log(this.$route.query.id) //查询参数传参 接收参数
   // console.log(this.$route.params.id) //动态路由传参 接收参数 


  }
}
</script>

<style lang="less" scoped>
.article-detail-page {
  .nav {
    height: 44px;
    border-bottom: 1px solid #e4e4e4;
    line-height: 44px;
    text-align: center;
    .back {
      font-size: 18px;
      color: #666;
      position: absolute;
      left: 10px;
      top: 0;
      transform: scale(1, 1.5);
    }
  }
  .header {
    padding: 0 15px;
    p {
      color: #999;
      font-size: 12px;
      display: flex;
      align-items: center;
    }
    img {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      overflow: hidden;
    }
  }
  .body {
    padding: 0 15px;
  }
}
</style>

Article.vue(列表页)

<template>
  <div class="article-page">
    <div
      v-for="item in articles"
      :key="item.id"
      class="article-item"
      @click="$router.push(`/detail/${item.id}`)"
      >
      <!-- @click="$router.push(`/detail?id=${item.id}`)" 查询参数传参-->

      <div class="head">
        <img :src="item.creatorAvatar" alt="" />
        <div class="con">
          <p class="title">{{ item.stem }}</p>
          <p class="other">{{ item.creatorName }} | {{ item.createdAt }}</p>
        </div>
      </div>
      <div class="body">
         {{ item.content }}
      </div>
      <div class="foot">点赞 {{ item.likeCount }} | 浏览 {{ item.views }}</div>
    </div>
  </div>
</template>

<script>
import axios from 'axios'
//首页请求渲染
// 1.安装 axios
// 2.看接口文档，确认请求方式，请求地址，请求参数
//    请求地址: https://mock.boxuegu.com/mock/3083/articles
//    请求方式: get
// 3.created中发送请求，获取数据，存起来
// 4.页面动态渲染


//跳转详情页传参 -> 渲染
// 1. 查询参数传参 (更适合多个参数)
//    ?参数=参数值 => this.$router.query.参数名
// 2. 动态路由传参 (单个参数更优雅方便)
//    改造路由 => /路径/参数 => this.$router.params.参数名
//修复小bug: (1) 访问 / 重定向 /article (redirect)
//           (2) 返回上一页 $router.back
export default {
  name: 'ArticlePage',
  data(){
    return {
      articles:[]
    }
  },
  async created() {
    const res = await axios.get('https://mock.boxuegu.com/mock/3083/articles')
    
    this.articles = res.data.result.rows
//    console.log(this.articles)
  },
}
</script>

<style lang="less" scoped>
.article-page {
  background: #f5f5f5;
}
.article-item {
  margin-bottom: 10px;
  background: #fff;
  padding: 10px 15px;
  .head {
    display: flex;
    img {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      overflow: hidden;
    }
    .con {
      flex: 1;
      overflow: hidden;
      padding-left: 15px;
      p {
        margin: 0;
        line-height: 1.5;
        &.title {
          text-overflow: ellipsis;
          overflow: hidden;
          width: 100%;
          white-space: nowrap;
        }
        &.other {
          font-size: 10px;
          color: #999;
        }
      }
    }
  }
  .body {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
    margin-top: 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
  }
  .foot {
    font-size: 12px;
    color: #999;
    margin-top: 10px;
  }
}
</style>