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)航正要離開的路由
 // next: Function: 一定要調(diào)用該方法來 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;