目录结构:

index.html文件内容

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title></title>

</head>
<body>
<div id="app">
    <div>
        <router-link to="/">首页</router-link>
        <router-link to="/about">关于我们</router-link>
    </div>
    <div>
        <router-view></router-view>
    </div>
</div>
    <!-- 注意js导入顺序,自己定义的要在下面 -->
    <script src="../js/vue.js"></script>
    <script src="../js/vue-router.js"></script>
    <script src="app.js"></script>
</body>
</html>

app.js文件

var routes = [
    {
        path:'/',
        component:{
            template:`
            <div>
                <h1>首页</h1>
            </div>
            ` ,
        },
    },
    {
        path:'/about',
        component:{
            template:`
            <div>
                <h1>关于我们</h1>
            </div>
            ` ,
        },
    }
];

var router = new VueRouter({
    routes:routes,
});

new Vue({
    el:'#app',
    router: router,
});