const router = new VueRouter({ ... })router.beforeEach((to, from, next) => { // ...})

import Vue from 'vue';import Router from 'vue-router';import LoginPage from '@/pages/login';import HomePage from '@/pages/home';import GoodsListPage from '@/pages/good-list';import GoodsDetailPage from '@/pages/good-detail';import CartPage from '@/pages/cart';import ProfilePage from '@/pages/profile';Vue.use(Router)const router = new Router({ routes: [  {   path: '/', // 默認(rèn)進(jìn)入路由   redirect: '/home'  //重定向  },  {   path: '/login',   name: 'login',   component: LoginPage  },  {   path: '/home',   name: 'home',   component: HomePage  },  {   path: '/good-list',   name: 'good-list',   component: GoodsListPage  },  {   path: '/good-detail',   name: 'good-detail',   component: GoodsDetailPage  },  {   path: '/cart',   name: 'cart',   component: CartPage  },  {   path: '/profile',   name: 'profile',   component: ProfilePage  },  {   path: '*',  // 匹配沒(méi)有注冊(cè)的路由   redirect: '/home'  //重定向  }, ]});// 全局路由守衛(wèi)router.beforeEach((to, from, next) => { console.log('navigation-guards'); // to: Route: 即將要進(jìn)入的目標(biāo) 路由對(duì)象 // from: Route: 當(dāng)前導(dǎo)航正要離開(kāi)的路由 // next: Function: 一定要調(diào)用該方法來(lái) resolve 這個(gè)鉤子。執(zhí)行效果依賴 next 方法的調(diào)用參數(shù)。 const nextRoute = ['home', 'good-list', 'good-detail', 'cart', 'profile']; let isLogin = global.isLogin; // 是否登錄 // 未登錄狀態(tài)；當(dāng)路由到nextRoute指定頁(yè)時(shí)，跳轉(zhuǎn)至login if (nextRoute.indexOf(to.name) >= 0) {   if (!isLogin) {   console.log('what fuck');   router.push({ name: 'login' })  } } // 已登錄狀態(tài)；當(dāng)路由到login時(shí)，跳轉(zhuǎn)至home  if (to.name === 'login') {  if (isLogin) {   router.push({ name: 'home' });  } } next();});export default router;