Vue + Element UI 前端篇（七）：功能组件封装

组件封装

为了避免组件代码的臃肿，这里对主要的功能部件进行封装，保证代码的模块化和简洁度。

组件结构

组件封装重构后，试图组件结构如下图所示

代码一览

Home组件被简化，包含导航、头部和主内容三个组件。

Home.vue

<template>
  <div class="container">
      <!-- 导航菜单栏 -->
      <MenuBar></MenuBar>
      <!-- 头部区域 -->
      <HeadBar></HeadBar>
      <!-- 主内容区域 -->
      <Main></Main>
  </div>
</template>

<script>
import HeadBar from "./HeadBar/HeadBar"
import MenuBar from "./MenuBar/MenuBar"
import Main from "./Main/Main"
export default {
  components:{
        HeadBar,
        MenuBar,
        Main
  }
};
</script>

<style scoped lang="scss">
  .container {
    position:absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    background: #4b5f6e;
  }
</style>

HeadBar.vue

<template> 
  <div class="container">
    <!-- 导航菜单隐藏显示切换 -->
    <span class="collapse-switcher" @click.prevent="collapse">
      <i class="el-icon-menu"></i>
    </span>
    <!-- 导航菜单 -->
    <span class="nav-bar">
      <el-menu :default-active="activeIndex" class="el-menu-demo" text-color="#fff"
          active-text-color="#ffd04b" mode="horizontal" @select="selectNavBar()">
        <el-menu-item index="1" @click="$router.push('/')">{{$t("common.home")}}</el-menu-item>
        <el-menu-item index="2">{{$t("common.doc")}}</el-menu-item>
        <el-menu-item index="3">{{$t("common.msgCenter")}}</el-menu-item>
      </el-menu>
    </span>
    <span class="tool-bar">
      <!-- 主题切换 -->
      <ThemePicker class="theme-picker"></ThemePicker>
      <!-- 语言切换 -->
      <LangSelector class="lang-selector"></LangSelector>   
      <!-- 用户信息 -->
      <el-dropdown class="user-info-dropdown" trigger="hover">
        <span class="el-dropdown-link"><img :src="this.userAvatar" /> {{username}}</span>
        <el-dropdown-menu slot="dropdown">
          <el-dropdown-item>{{$t("common.myMsg")}}</el-dropdown-item>
          <el-dropdown-item>{{$t("common.config")}}</el-dropdown-item>
          <el-dropdown-item divided @click.native="logout">{{$t("common.logout")}}</el-dropdown-item>
        </el-dropdown-menu>
      </el-dropdown>
    </span>
  </div>
</template>

<script>
import mock from "@/mock/index.js";
import ThemePicker from "@/components/ThemePicker"
import LangSelector from "@/components/LangSelector"
export default {
  components:{
        ThemePicker,
        LangSelector
  },
  data() {
    return {
      isCollapse: false,
      username: "Louis",
      userAvatar: "",
      activeIndex: '1'
    };
  },
  methods: {
    selectNavBar(key, keyPath) {
      console.log(key, keyPath)
    },
    // 语言切换
    handleCommand(command) {
      let array = command.split(':')
      let lang = array[0] === '' ? 'zh_cn' : array[0]
      let label = array[1]
      document.getElementById("language").innerHTML = label
      this.$i18n.locale = lang
    },
    //折叠导航栏
    collapse: function() {
      this.isCollapse = !this.isCollapse;
    },
    //退出登录
    logout: function() {
      var _this = this;
      this.$confirm("确认退出吗?", "提示", {
        type: "warning"
      })
      .then(() => {
        sessionStorage.removeItem("user");
        this.$router.push
        ("/login");
      })
      .catch(() => {});
    }
  },
  mounted() {
    this.sysName = "I like Kitty";
    var user = sessionStorage.getItem("user");
    if (user) {
      this.userName = user;
      this.userAvatar = require("@/assets/user.png");
    }
  }
};
</script>

<style scoped lang="scss">
.container {
  position: absolute;
  left: 200px;
  right: 0px;
  height: 60px;
  line-height: 60px;
  .collapse-switcher {
    width: 40px;
    float: left;
    cursor: pointer;
    border-color: rgba(111, 123, 131, 0.8);
    border-left-width: 1px;
    border-left-style: solid;
    border-right-width: 1px;
    border-right-style: solid;
    color: white;
    background: #504e6180;
  }
  .nav-bar {
    margin-left: auto;
    float: left;
    .el-menu {
      background: #504e6180;
    }
  }
  .tool-bar {
    float: right;
    .theme-picker {
      padding-right: 10px;
    }
    .lang-selector {
      padding-right: 10px;
      font-size: 15px;
      color: #fff;
      cursor: pointer;
    }
    .user-info-dropdown {
      font-size: 20px;
      padding-right: 20px;
      color: #fff;
      cursor: pointer;
      img {
        width: 40px;
        height: 40px;
        border-radius: 10px;
        margin: 10px 0px 10px 10px;
        float: right;
      }
    }
  }
}
</style>

MenuBar.vue

<template>
    <div class="menu-bar-container">
    <!-- logo -->
    <div class="logo" :class="isCollapse?'menu-bar-collapse-width':'menu-bar-width'">
        <img :src="this.logo" /> <div>{{isCollapse?'':sysName}}</div>
    </div>
    <!-- 导航菜单 -->
    <el-menu default-active="1-1" :class="isCollapse?'menu-bar-collapse-width':'menu-bar-width'" @open="handleopen" @close="handleclose" @select="handleselect" :collapse="isCollapse">
      <el-submenu index="1">
        <template slot="title">
          <i class="el-icon-location"></i>
          <span slot="title">{{$t("sys.sysMng")}}</span>
        </template>
        <el-menu-item index="1-1" @click="$router.push('user')">{{$t("sys.userMng")}}</el-menu-item>
        <el-menu-item index="1-2" @click="$router.push('dept')">{{$t("sys.deptMng")}}</el-menu-item>
        <el-menu-item index="1-3" @click="$router.push('role')">{{$t("sys.roleMng")}}</el-menu-item>
        <el-menu-item index="1-4" @click="$router.push('menu')">{{$t("sys.menuMng")}}</el-menu-item>
        <el-menu-item index="1-5" @click="$router.push('log')">{{$t("sys.logMng")}}</el-menu-item>
      </el-submenu>
      <el-submenu index="2">
        <template slot="title">
          <i class="el-icon-location"></i>
          <span slot="title">{{$t("sys.sysMonitor")}}</span>
        </template>
      </el-submenu>
      <el-menu-item index="3" disabled>
        <i class="el-icon-document"></i>
        <span slot="title">{{$t("sys.nav3")}}</span>
      </el-menu-item>
      <el-menu-item index="4">
        <i class="el-icon-setting"></i>
        <span slot="title">{{$t("sys.nv4")}}</span>
      </el-menu-item>
    </el-menu>
    </div>
</template>

<script>
export default {
  data() {
    return {
      isCollapse: false,
      sysName: "",
      logo: "",
    };
  },
  methods: {
    handleopen() {
      console.log('handleopen');
    },
    handleclose() {
      console.log('handleclose');
    },
    handleselect(a, b) {
      console.log('handleselect');
    }
  },
  mounted() {
    this.sysName = "I like Kitty";
    this.logo = require("@/assets/logo.png");
  }
};
</script>

<style scoped lang="scss">
.menu-bar-container {
  .el-menu {
    position:absolute;
    top: 60px;
    bottom: 0px;
    text-align: left;
  }
  .logo {
    position:absolute;
    top: 0px;
    height: 60px;   
    line-height: 60px;
    background: #4b5f6e;
    img {
        width: 40px;
        height: 40px;
        border-radius: 0px;
        margin: 10px 10px 10px 10px;
        float: left;
    }
    div {
      font-size: 22px;
      color: white;
      text-align: left;
    }
  }
  .menu-bar-width {
    width: 200px;
  }
  .menu-bar-collapse-width {
    width: 65px;
  }
}
</style>

Main.vue

<template>
  <div class="container">
    <el-breadcrumb separator="/" class="breadcrumb">
      <el-breadcrumb-item v-for="item in $route.matched" :key="item.path">
        <a href="www.baidu.com">{{ item.name }}</a>
      </el-breadcrumb-item>
    </el-breadcrumb>
    <transition name="fade" mode="out-in">
      <router-view></router-view>
    </transition>
  </div>
</template>

<script>
export default {
  data() {
    return {
    };
  },
  methods: {

  },
  mounted() {

  }
};
</script>

<style scoped lang="scss">
.container {
  position: absolute;
  top: 60px;
  bottom: 0px;
  left: 200px;
  right: 0px;
  .breadcrumb {
    padding: 10px;  
    border-color: rgba(38, 86, 114, 0.2);
    border-bottom-width: 1px;
    border-bottom-style: solid;
    background: rgba(138, 158, 170, 0.2);
  }
}
</style>

国际化语言切换也被封装成为了组件 LangSelector

LangSelector/index.js

<template>
  <el-dropdown class="lang-selector" @command="handleCommand">
    <span class="el-dropdown-link">
      <span id="language">中文</span><i class="el-icon-arrow-down el-icon--right"></i>
    </span>
    <el-dropdown-menu slot="dropdown">
      <el-dropdown-item command="zh_cn:中文">中文</el-dropdown-item>
      <el-dropdown-item command="en_us:English">English</el-dropdown-item>
    </el-dropdown-menu>
  </el-dropdown>
</template>

<script>
  export default {
    methods: {
      // 语言切换
      handleCommand(command) {
        let array = command.split(':')
        let lang = array[0] === '' ? 'zh_cn' : array[0]
        let label = array[1]
        document.getElementById("language").innerHTML = label
        this.$i18n.locale = lang
      }
    }
  }
</script>

组件封装重构之后，同步修改路由配置

import Vue from 'vue'
import Router from 'vue-router'
import Login from '@/views/Login'
import NotFound from '@/views/404'
import Home from '@/views/Home'
import Intro from '@/views/Intro'
import User from '@/views/SysMng/User'
import Dept from '@/views/SysMng/Dept'
import Role from '@/views/SysMng/Role'
import Menu from '@/views/SysMng/Menu'
import Log from '@/views/SysMng/Log'

Vue.use(Router)

const router = new Router({
  routes: [
    {
      path: '/',
      name: '首页',
      component: Home,
      children: [
        { path: '', component: Intro, name: '系统介绍' },
        { path: '/user', component: User, name: '用户管理' },
        { path: '/dept', component: Dept, name: '机构管理' },
        { path: '/role', component: Role, name: '角色管理' },
        { path: '/menu', component: Menu, name: '菜单管理' },
        { path: '/log', component: Log, name: '日志管理' }
      ]
    },
    {
      path: '/login',
      name: '登录',
      component: Login
    }
    ,{
      path: '/404',
      name: 'notFound',
      component: NotFound
    }
  ]
})

router.beforeEach((to, from, next) => {
  // 登录界面登录成功之后，会把用户信息保存在会话
  // 存在时间为会话生命周期，页面关闭即失效。
  let user = sessionStorage.getItem('user');
  if (to.path == '/login') {
    // 如果是访问登录界面，如果用户会话信息存在，代表已登录过，跳转到主页
    if(user) {
      next({ path: '/' })
    } else {
      next()
    }
  } else {
    // 如果访问非登录界面，且户会话信息不存在，代表未登录，则跳转到登录界面
    if (!user) {
      next({ path: '/login' })
    } else {
      next()
    }
  }
})

export default router