vue-router的router.go(n)问题？

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<template>   <div>         <mt-navbar v-model="selected" class="container"  @click.native="goRouter">         <mt-tab-item id="head-nav1">新歌</mt-tab-item>         <mt-tab-item id="head-nav2">排行</mt-tab-item>         <mt-tab-item id="head-nav3">歌单</mt-tab-item>         <mt-tab-item id="head-nav4">歌手</mt-tab-item>         <mt-tab-item id="head-nav5">彩铃</mt-tab-item>       </mt-navbar>     </div> </template>   <script type="es6">   import { Navbar, TabItem } from 'mint-ui';   export default {     name:'head-nav',     data(){       return {         selected:'head-nav1'       }     },     components:{Navbar, TabItem},     methods:{       goRouter(){         var navItem=this.selected.charAt(this.selected.length-1);         switch(navItem){           case '1':this.$router.push({path:'index'});break;           case '2':this.$router.push({path:'rank'});break;           case '3':this.$router.push({path:'plist'});break;           case '4':this.$router.push({path:'singer'});break;           case '5':this.$router.push({path:'ringtone'});break;         }       }     }   } </script>   回到上一级可以这么写   <template>   <div class="rank-head container" :style="style">     <a class="rank-head-back" @click="routerBack"></a>     {{title}}   </div> </template>   <script type="es6">   export default {     props:['title','style'],     name:'rank-head',     methods:{       routerBack(){         this.$router.go(-1);       }     }   } </script>   这个demo的地址https://github.com/lavyun/vue-kugouMusic