舉個例子：
  角色A =>功能1
     =>功能2
     =>功能3
     
  角色B =>功能1
     =>功能4
     =>功能5

//動態(tài)路由(所有角色的都在這里,我們都做好組件頁面了所以我們一定有這個，防君子不防小人)
export const dynamicRouter = [
  { path: '/b', name: 'b', component: pageB },
  { path: '/c', name: 'c', component: pageC },
];

//默認路由(無需登錄就可以使用)
const routes = [
  { path: '/', redirect: '/login' },
  { path: '/login', component: pageLogin},
  { path: '/404', component: page404},
  { path: '*', redirect: '/404' },
];

const router = new VueRouter({
  mode: 'history',
  routes, // (縮寫) 相當于 routes: routes
});

// vue 組件
<li @click="login(['b'])">
 模擬用戶1登錄，權限['b']，跳轉到頁面B
</li>
<li @click="login(['c'])">
 模擬用戶2登錄，權限['c']，跳轉到頁面B,(用戶2沒有頁面B權限，強行進入會gun去頁面404)
</li>

// 登錄模塊---------------------------------------------------------
import { mapActions } from "vuex";
export default {
 methods: {
  ...mapActions([
   "set_roleRouterRules"
  ]),
  login(roleRouterRules) {
   // 登錄成功，vuex 存儲角色路由
   this.set_roleRouterRules(roleRouterRules);
   // 跳轉到動態(tài)注冊B
   this.$router.replace({ path: "/b" });
  }
 }
};

// vuex 對應功能實現(xiàn)-----------------------------------------------
// 引入第1步 定義的dynamicRouter 
import { dynamicRouter } from './router';
// 私有變量
state: {
  isAddRoutes: false,
  // 后端返回的原始數(shù)據(jù)默認存到 localStorage，每次初始化取出來
  roleRouterRules: JSON.parse(localStorage.getItem('roleRouterRules')),
},
// 公共變量 => 派生私有變量
getters: {
  isAddRoutes: state => state.isAddRoutes,
  // 根據(jù) roleRouterRules 生成當前角色的動態(tài)路由配置數(shù)據(jù)（addRoutes方法可以直接使用的路由數(shù)組)
  roleRouter: state => {
    if (state.roleRouterRules) {
      return dynamicRouter.filter(
        router => state.roleRouterRules.indexOf(router.name) >= 0,
      );
    } else return null;
  },
},
// 私有方法(同步) => 改變靜態(tài)變量
mutations: {
  set_isAddRoutes: (state, data) => (state.isAddRoutes = data), // payload: true/false
  set_roleRouterRules: (state, data) => (state.roleRouterRules = data), // payload: true/false
},
// 公共方法（可異步）=> 調用私有方法
actions: {
  set_isAddRoutes({ commit }, data) {
    commit('set_isAddRoutes', data);
  },
  set_roleRouterRules({ commit }, data) {
    // 保存到vuex
    commit('set_roleRouterRules', data);
    // 保存到 localStorage,當用戶強制刷新瀏覽器時我們要使用這一份數(shù)據(jù)初始化 state.roleRouterRules
    localStorage.setItem('roleRouterRules', JSON.stringify(data));
  },
}

import vuex from './vuex';
router.beforeEach((to, from, next) => {
  let path = to.redirectedFrom || to.path;
  // 白名單 放行
  if (whiteList.indexOf(path) >= 0) return next();
  // 黑名單
  if (!vuex.getters.roleRouter) return next({ path: '/login' });
  if (!vuex.getters.isAddRoutes) {
    console.log('path未注冊,存在角色路由，立即注冊嘗試匹配');
    router.addRoutes(vuex.getters.roleRouter);
    vuex.dispatch('set_isAddRoutes', true);
    next(path);
  } else {
    console.log('已注冊過動態(tài)路由，嘗試匹配');
    next();
  }
});

exit() {
 localStorage.clear();
 window.location.reload();
}