vue 动态添加的路由页面刷新时失效的原因及解决方案

const constantRoutes = [
 {
  path: '/',
  redirect: '/login'
 },
 {
  path: '/login',
  name: 'login',
  meta: {
   auth: false
  },
  component: () => import('@/views/login')
 },
 {
  path: '/layout',
  name: 'layout',
  meta: {
   auth: true
  },
  component: () => import('@/views/layout/index'),
  children: [
   {
    path: '/index',
    name: 'index',
    component: () => import('@/views/home')
   }
  ]
 },
 {
  path: '*',
  component: () => import('@/views/error/404')
 }
]

Vue.use(VueRouter)
const createRouter = () =>
 new VueRouter({
  routes: constantRoutes
 })
export function resetRouter() {
 const newRouter = createRouter()
 router.matcher = newRouter.matcher // reset router
}
const router = createRouter()
 
//页面刷新后重新设置权限页面动态路由，防止出现动态路由404问题
const reSetPermissionList = to => {
 return new Promise((resolve, reject) => {
  if (to.path !== '/login' && store.state.permission.permissionList.length === 0) {
   store
    .dispatch('permission/getPermissionList')
    .then(() => {
     resolve('permCode')
    })
    .catch(error => {
     resolve('permCode')
    })
  } else {
   resolve()
  }
 })
}
router.beforeEach((to, from, next) => {
  
 const accessToken = localStorage.getItem('accessToken')
 if (_.isEmpty(accessToken)) {//是否已经登录 否 去登陆页面
  next({
   path: '/login',
   query: {
    redirect: to.fullPath
   }
  })
 } else { //已登录用户进入页面
  if (to.path === '/login') {
   next({ path: '/index' })
  } else {
    reSetPermissionList(to).then(data => {
     data === 'permCode' ? next({ path: to.path, query: to.query }) : next()
    })
  }
 }
 
})