简单vue路由卫士例子

import Vue from 'vue'
import VueRouter from 'vue-router'
import Home from '../views/Home.vue'

import Filling from '../components/filling.vue'
import ChoiceTopic from '../components/ChoiceTopic.vue'
import Record from '../components/record.vue'
import Manage from '../components/manage.vue'
import Login from '../components/login.vue'

Vue.use(VueRouter)
// const originalPush = VueRouter.prototype.push
//    VueRouter.prototype.push = function push(location) {
//    return originalPush.call(this, location).catch(err => err)
// }

const routes = [
  {
    path: '/home',
    name: 'home',
    component: Home,
    children:[
      {
        path:"/filling",
        name:'filling',
        component:Filling,
        meta:{requireAuth:true}
      },{
        path:"/choicetopic",
        name:'choiceTopic',
        component:ChoiceTopic,
        meta:{requireAuth:true}
      },{
        path:"/record",
        name:'record',
        component:Record,
        meta:{requireAuth:true}
      },{
        path:"/manage",
        name:'manage',
        component:Manage,
        meta:{requireAuth:true}
      }    
    ],
    meta:{requireAuth:true}
  },{
    path: '/login',
    name: 'login',  
    component: Login,
  },{
    path: '/',
    redirect: '/login'   //重定向
  },
  {
    path: '**',   // 错误路由
    redirect: '/'   //重定向
  } 
]

const router = new VueRouter({
  routes
})

// 全局路由守卫
router.beforeEach((to, from, next) => {
  console.log('已开启路由守卫');
  if (to.meta.requireAuth) { // 判断该路由是否需要登录权限
    if(sessionStorage.getItem("isLogin")){ //判断本地是否存在access_token
      next();
    }else {
      next({
        path:'/'
      })
    }
  }
  else {
    next();
  }

});

export default router

我这里用的是sessionStorage来检验数据，你也可以用vuex或者其他的。
知识点：

meta:{requireAuth:true}

// 全局路由守卫
router.beforeEach((to, from, next) => {
  console.log('已开启路由守卫');
  if (to.meta.requireAuth) { // 判断该路由是否需要登录权限
    if(sessionStorage.getItem("isLogin")){ //判断本地是否存在access_token
      next();
    }else {
      next({
        path:'/'
      })
    }
  }
  else {
    next();
  }