导航钩子 

<!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">用户登录</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/vue-router.js"></script>
<script src="js/main.js"></script>
</body>
</html>
var routes = [
    {
        path: "/",
        component: {
            template: `
            <h1>首页管理</h1>
            `
        }
    },
    {
        path: "/login",
        component: {
            template: `
            <h1>用户登录</h1>
            `
        }
    },
    {
        path: "/post",
        component: {
            template: `
            <h1>帖子管理</h1>
            `
        }
    },

];

var router = new VueRouter({
    routes: routes
});
router.beforeEach(function (to,from ,next) {   //类似于中间件 ，访问之前做判断
    var logged_in = false;                      //用户未登录状态
    if(!logged_in && to.path == "/post")        //如果用户未登录且要跳转到post页面
        next("/login");
    else
        next()           //正常执行
});
router.afterEach(function (to,from) {
    //执行完之后要执行的函数
})
new Vue({
    el: "#app",
    router: router
})

 

posted @ 2018-01-30 22:33  前方、有光  阅读(188)  评论(0)  编辑  收藏  举报