问题？我们需要让其每个页面的共有部分不再重复编写，怎么降低代码的冗余度？

例如：导航栏的共用组件怎么实现？

解决

App.vue中写好公共组件

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实现

<template>
  <div id="app">
    <!-- 头部，导航栏 -->
    <!-- 
        v-if="$route.meta.keepAlive" 
      keep−alive是Vue内置的一个组件，可以使被包含的组件保留状态，或避免重新渲染。
      route.meta则可以选择让需要的页面才展示。 
    -->
    <el-container v-if="$route.meta.keepAlive">

      <el-header>
        <keep-alive>
          <!-- 导航栏 -->
          <header-nav></header-nav>
        </keep-alive>
      </el-header>

      <el-container>

        <el-main>
          <!-- Body main -->
          <router-view></router-view>
        </el-main>

      </el-container>

      <!-- footer -->
      <el-container>

        <el-footer>
          <keep-alive>
            <foot></foot>
          </keep-alive>

        </el-footer>

      </el-container>
    </el-container>

    <!-- 登录页 -->
    <router-view v-if="!$route.meta.keepAlive"></router-view>

  </div>

</template>

js

<script>
  // 每个页面的导航栏
  import Nav from "./components/Nav.vue"
  import Footer from "./components/Footer.vue"

  export default {
    name: "app",
    components: {
      headerNav: Nav,
      Foot:Footer,

    },
    data() {
      return {

      }
    },
  }
</script>

<style>

</style>

main.js

import Vue from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
// import { Button, Select,Form ,FormItem,Input,Carousel,CarouselItem} from 'element-ui';
import ElementUI from 'element-ui';
import "element-ui/lib/theme-chalk/index.css"
Vue.use(ElementUI);

// Vue.use(CarouselItem)
// Vue.use(Carousel)
// Vue.use(Button)
// Vue.use(Form)
// Vue.use(Input)
// Vue.use(FormItem)
// Vue.use(Select)


Vue.config.productionTip = false

new Vue({
  router,
  store,
  render: h => h(App),
  template:"<App></App>"
}).$mount('#app')

router---index.js(router.js)

import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../views/login/Login.vue'
import Register from '../views/register/Register.vue'
import Home from '../views/home/Home.vue'
import News from '../views/news/News.vue'
import Vuexx from '../components/Vuexx.vue'


Vue.use(VueRouter)

const routes = [
  //  登录，注册
  {
    // 重定向到登录页面
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    name: 'login',
    component: Login,
    meta: {
      title: 'Login',
      keepAlive: false
    }
  },
  {
    path: '/register',
    name: 'register',
    component: Register,
    meta: {
      title: 'Register',
      keepAlive: false
    }
  },
  // 首页 home index
  {
    path: '/home',
    name: 'home',
    component: Home,
    meta: {
      title: 'Home',
      keepAlive: true
    }
  },
  // 新闻页面组件
  {
    path: '/news',
    name: 'news',
    component: News,
    meta: {
      title: 'News',
      keepAlive: true
    }
  },
  // vuex
  {
    path: '/vuexx',
    name: 'vuexx',
    component: Vuexx,
    meta: {
      title: 'Vuexx',
      keepAlive: true
    }
  },
]

const router = new VueRouter({
  routes
})

export default router

实现

参考

参考