Vue uses element-ui to implement menu navigation

npm install vue-router --save
npm install element-ui --save

module.exports = {
    lintOnSave: false
}

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

import VueRouter from 'vue-router'
import ElementUI from 'element-ui'
import 'element-ui/lib/theme-chalk/index.css'


import movie from './components/movie.vue'
import novel from './components/novel.vue'

Vue.config.productionTip = false

Vue.use(VueRouter)
Vue.use(ElementUI);

const routes = [
  { path: '/movie', component: movie },
  { path: '/novel', component: novel }
]

// 3. Create a router instance and pass the `routes` configuration // You can also pass other configuration parameters, but let's keep it simple for now.
const router = new VueRouter({
  mode: 'history', //h5 mode routes // (abbreviation) equivalent to routes: routes
})

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

<template>
  <div>    
    movie page</div>
</template>

<script>
export default {
  name: 'movie' 
}
</script>


<style scoped>

</style>

<template>
  <div>
    novel page</div>
</template>

<script>
export default {
  name: 'novel'  
}
</script>
<style scoped>

</style>

<template>
  <div id="NavMenu">
    <el-menu
      :default-active="activeIndex"
      class="el-menu-demo"
      mode="horizontal"
      @select="handleSelect"
      router
    >
      <!-- 
      <el-menu-item index="1">Movies</el-menu-item>
      <el-menu-item index="2">Novel</el-menu-item>
      <el-submenu index="3">
        <template slot="title">My Workbench</template>
        <el-menu-item index="3-1">Option 1</el-menu-item>
        <el-menu-item index="3-2">Option 2</el-menu-item>
        <el-menu-item index="3-3">Option 3</el-menu-item>
        <el-submenu index="3-4">
          <template slot="title">Option 4</template>
          <el-menu-item index="3-4-1">Option 1</el-menu-item>
          <el-menu-item index="3-4-2">Option 2</el-menu-item>
          <el-menu-item index="3-4-3">Option 3</el-menu-item>
        </el-submenu>
      </el-submenu> 
      -->

      <template v-for="item in navMenuData">
        <el-menu-item :index="item.index" v-if="!item.child">{{item.name}}</el-menu-item>

        <el-submenu :index="item.index" v-if="item.child">
          <template slot="title">{{item.name}}</template>
          <template v-for="item2 in item.child">
            <el-menu-item :index="item2.index">{{item2.name}}</el-menu-item>
          </template>
        </el-submenu>
      </template>
    </el-menu>
  </div>
</template>

<script>
export default {
  name: "NavMenu",
  data() {
    return {
      activeIndex: "movie",     
      navMenuData:
        { index: "movie", name: "movie" },
        { index: "novel", name: "novel" },
        {
          index: "2",
          name: "My Workbench",
          child: [{ index: "2-1", name: "Option 1" },{ index: "2-2", name: "Option 2" },{ index: "2-3", name: "Option 3" }]
        },
       
      ]
    };
  },
  methods: {
    handleSelect(key, keyPath) {
      console.log(key, keyPath);
    }
  },
  mounted(){         
      console.log(this.activeIndex)        
      console.log(this.$route.path)      
      this.activeIndex = this.$route.path.substring(1,this.$route.path.length);     

  }
};
</script>

<style scoped>
</style>

<template>
  <div id="app">
    <el-container>
      <el-header>
        <NavMenu></NavMenu>
      </el-header>
      <el-main>
         <router-view></router-view> <!--Route exit-->
      </el-main>
      <el-footer>Footer</el-footer>
    </el-container>
  </div>
</template>

<script>
import NavMenu from "./components/NavMenu.vue";

export default {
  name: "app",
  components:
    NavMenu
  }
};
</script>

<style scoped>
.el-header,
.el-footer {
  background-color: #b3c0d1;
  color: #333;
  text-align: center;
  height: 100px;
  padding: 0px;
}

.el-main {
  background-color: #e9eef3;
  color: #333;
  text-align: center;
  line-height: 160px;
}

</style>