{
 path: '/router',
 name: 'router',
 meta: {
 title: '标题',
 roles: ['admin','user']
 },
 component: index,
 children: [
 {
 path: 'children',
 name: 'children',
 meta: {
 title: '子标题',
 roles: ['admin','user']
 },
 component: child
 }
 ]
}

// 过滤路由 menuList-菜单 roles-用户角色
const checkMenuList = (menuList, roles) => {
 for (let i = 0; i < menuList.length; i++) {
 if (!compareEqual(roles, menuList[i].meta.roles) || menuList[i].meta.noRenderTree) {
 menuList.splice(i, 1)
 i -= 1
 } else {
 if (menuList[i].children) {
 checkMenuList(menuList[i].children, roles)
 }
 }
 }
 return menuList
}

// router.js

 // 基本路由
export const defaultRouter = [
 { path: '/', component: index }, // 首页
 { path: '/login', name: 'login', component: login } // 登录页
 ]
 
 // 项目全部页面
export const appRouter = [
 {
 path: '/router1',
 name: 'router1',
 redirect: '/router1/test1',
 component: router1,
 meta: { title: '路由1'},
 children: [
 { path: 'test1', name: 'test1', component: test1, meta: { title: '测试1' } },
 { path: 'test2', name: 'test2', component: test1, meta: { title: '测试2' } }
 ]
 },
 ]
 // 这个是我们页面初始化时候，注册的routes
const routers = [ 
 ...defaultRouter
]
const RouterConfig = {
 routes: routers
}
const router = new VueRouter(RouterConfig)

// 服务器端返回的键值对： 路由名：是否有权限
authRouter:{
 'test1': false,
 'test2': true
}

// 过滤路由 appRouterCopy-项目全部页面 authRouter-权限列表
const checkMenuList = (appRouterCopy, authRouter) => {
 for (let i = 0; i < appRouterCopy.length; i++) {
 let {name, children} = appRouterCopy[i]
 if (authRouter[name] === false) {
  appRouterCopy.splice(i, 1)
  i--
 } else if (children && children.length) {
  checkMenuList(children, authRouter)
 }
 }
}

let error404Page = { path: '/*', name: 'error-404', meta: 
{ 
title: '404-页面不存在'}, component: error404Page
}
router.addRoutes([...appRouterCopy, error404Page])

router.beforeEach(((to, from, next) => {
 if (isNotLog && to.name !== 'login') {
 // 未登录 跳转到登录页
  next({ name: 'login' })
 } else if (to.name && (to.name === 'login' || to.name.indexOf('error') !== -1)){
 // 跳转异常
 next()
 } else {
 // 校验用户权限
 checkUser(next, to ,router)
 }
})

const checkUser = async (next, to ,router) => {
 if (isNotUser) {
 // 首次登陆系统，没有用户信息的时候 需要获取用户信息做过滤路由的操作
 const authRouter = getAuthRouter() // 获取用户权限
 checkMenuList(appRouterCopy, authRouter)
 const error404Page = { path: '/*', name: 'error-404', meta: { title: '404-页面不存在'}, component: error404Page}
 router.addRoutes([...appRouterCopy, error404Page])
 if (!appRouterCopy.length) {
  // 用户没有有权限的路由 可以跳转到404或者登录页
  next({ ...error404Page, replace: true })
 } else {
  next({ ...to, replace: true })
 }
 } else {
 next()
 }
}