vue报错感觉不是代码编写的问题

应该不是代码的问题

<template>
  <h2>我是About组件的内容</h2>
</template>

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

components\Home.vue
<template>
  <h2>我是Home组件的内容</h2>
</template>

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

router\index.js
//该文件专门用于创建整个应用的路由器
import VueRouter from "vue-router";
//引入组件
import Home from '../components/Home'
import About from '../components/About'

//创建并暴露一个路由器
router =  new VueRouter({
    routes:[
        {
            path:'/about',
            component:About
        },
        {
            path:'/home',
            component:Home
        }
    ]
})

export default router

App.vue
<template>
    <div>
        <div class="row">
            <div class="col-xs-offset-2 col-xs-8">
                <div class="page-header"><h2>Vue Router Demo</h2></div>
            </div>
        </div>
        <div class="row">
            <div class="col-xs-2 col-xs-offset-2">
                <div class="list-group">
                    <!-- 原始html中我们使用a标签实现页面跳转 -->
                    <!-- <a class="list-group-item active" href="./about.html">About</a>
                    <a class="list-group-item" href="./home.html">Home</a> -->
                    
                    <!-- Vue中借助router-link标签实现路由的切换 -->
                    <router-link class="list-group-item" active-class="active" to="/about">                             About
                    </router-link>
                    <router-link class="list-group-item" active-class="active" to="/home">
                        Home
                    </router-link>
                </div>
            </div>
            <div class="col-xs-6">
                <div class="panel">
                    <div class="panel-body">
                        <!-- 指定组件的呈现位置 -->
                        <router-view></router-view>
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
    export default {
        name:'App',
    }
</script>

```javascript
main.js
import Vue from 'vue'
import App from './App.vue'
import VueRouter from 'vue-router'
import router from './router'

Vue.config.productionTip = false
Vue.use(VueRouter)

new Vue({
    el:"#app",
    render: h => h(App),
    router
})

```

依赖没装吗？

npm i

npm install --save vue