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index.html:

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Title</title></head><body><div id="app">    <div>        <router-link to="/">首页</router-link>        <router-link to="/login">登录</router-link>        <router-link to="/post">帖子管理</router-link>    </div>    <div>        <router-view></router-view>    </div></div><script src="../lib/vue.js"></script><script src="../lib/router.js"></script><script src="./js/app.js"></script></body></html>

app.js:

var routes = [    {        path: '/',        component:{            template: `            <p>这里是首页</p>        `        }    },{        path: '/login',        component: {            template: `            <p>这里是登录!</p>        `        }    },{        path: '/post',        component: {            template: `            <p>这里是帖子管理</p>        `        }    }];var router = new VueRouter({    routes: routes,});router.beforeEach(function(to, from, next){    var login_in = true;    if(!login_in && to.path == '/post'){        next('/login')    }else{        next();    }})router.afterEach(function(to, from){    console.log("to", to);    console.log("form", from);});var app = new Vue({    el: '#app',    router: router})

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