vue-element-admin 实现动态路由(从后台查询出菜单列表绑定)

1. 在路由实例中保留基础路由

router/index.js中只需要保留基础路由，其他的都删了

2. 获取用户菜单，并保存到Vuex中

stroe/modules/user.js中，有个getInfo方法查询用户基本信息，返回了用户的菜单列表

// get user info
  getInfo({ commit, state }) {
    return new Promise((resolve, reject) => {
      getInfo(state.token).then(response => {
        const { data } = response
        if (!data) {
          reject('Verification failed, please Login again.')
        }
        console.log(data)
        const menus =
        [{
          path: '/books',
          component: 'Layout',
          children: [{
            path: 'index',
            name: 'AddressBook',
            component: 'workbench/addressbook',
            meta: { title: '通讯录', icon: 'company' }
          }]
        },
        {
          path: '/systool',
          component: 'Layout',
          redirect: '/systool/coder',
          name: 'SysTool',
          meta: { title: '实验室', icon: 'example' },
          children: [
            {
              path: 'calendar',
              name: 'Calendar',
              component: 'workbench/calendar',
              meta: { title: '日程', icon: 'table' }
            }
          ]
        }]
        const { name, avatar, companyName, employeeid } = data
        commit('SET_NAME', name)
        commit('SET_AVATAR', avatar)
        commit('SET_CMPNAME', companyName)
        commit('SET_USERID', employeeid)
        commit('SET_MENUS', menus)
        resolve(data)
      }).catch(error => {
        reject(error)
      })
    })
  }

user.js

const getters = {
  sidebar: state => state.app.sidebar,
  device: state => state.app.device,
  token: state => state.user.token,
  avatar: state => state.user.avatar,
  name: state => state.user.name,
  cmpname: state => state.user.cmpname,
  userid: state => state.user.userid,
  menus: state => state.user.menus
}
export default getters

getter.js

3.动态生成权限路由（核心）

根据环境配置导入组件,在vue中，将菜单路径作为参数，实现路由地址的注入

在 src/router 文件夹下，建立两个文件，各只需添加一行代码, 定义导入方法

src/router/_import_development.js
//开发环境导入组件
module.exports = file => require('@/views' + file + '.vue').default // vue-loader at least v13.0.0+

---------------------------------------------------------------------

src/router/_import_production.js
//生产环境导入组件
module.exports = file => () => import('@/views' + file + '.vue')

A，组件导入 —— _import

//获取组件的方法
const _import = require('./router/_import_' + process.env.NODE_ENV)

// .......

//导入路径下的组件
route.component = _import(route.path)

B，在路由钩子中，过滤路由，并生成路由

核心在src目录下的permission.js中，router.beforeEach路由钩子

 import router from './router'
 import store from './store'
 import {
   Message
 } from 'element-ui'
 import NProgress from 'nprogress' // progress bar
 import 'nprogress/nprogress.css' // progress bar style
 import {
   getToken
 } from '@/utils/auth' // get token from cookie
 import getPageTitle from '@/utils/get-page-title'
 import Layout from '@/layout'
 const _import = require('./router/_import_' + process.env.NODE_ENV) // 获取组件的方法

 NProgress.configure({
   showSpinner: false
 }) // NProgress Configuration

 const whiteList = ['/login'] // no redirect whitelist

 router.beforeEach(async(to, from, next) => {
   // start progress bar
   NProgress.start()

   // set page title
   document.title = getPageTitle(to.meta.title)

   // determine whether the user has logged in
   const hasToken = getToken()

   if (hasToken) {
     if (to.path === '/login') {
       // if is logged in, redirect to the home page
       next({
         path: '/'
       })
       NProgress.done()
     } else {
       const hasGetUserInfo = store.getters.name
       if (hasGetUserInfo) {
         next()
       } else {
         try {
           // get user info
           await store.dispatch('user/getInfo')
           if (store.getters.menus.length < 1) {
             global.antRouter = []
             next()
           }
           const menus = filterAsyncRouter(store.getters.menus) // 1.过滤路由
           router.addRoutes(menus) // 2.动态添加路由
           global.antRouter = menus // 3.将路由数据传递给全局变量，做侧边栏菜单渲染工作
           next({
             ...to,
             replace: true
           }) // hack方法 确保addRoutes已完成 ,set the replace
         } catch (error) {
           // remove token and go to login page to re-login
           await store.dispatch('user/resetToken')
           Message.error(error || 'Has Error')
           next(`/login?redirect=${to.path}`)
           NProgress.done()
         }
       }
     }
   } else {
     /* has no token*/

     if (whiteList.indexOf(to.path) !== -1) {
       // in the free login whitelist, go directly
       next()
     } else {
       // other pages that do not have permission to access are redirected to the login page.
       next(`/login?redirect=${to.path}`)
       NProgress.done()
     }
   }
 })

 router.afterEach(() => {
   // finish progress bar
   NProgress.done()
 })

 // 遍历后台传来的路由字符串，转换为组件对象
 function filterAsyncRouter(asyncRouterMap) {
   const accessedRouters = asyncRouterMap.filter(route => {
     if (route.component) {
       if (route.component === 'Layout') {
         route.component = Layout
       } else {
         route.component = _import(route.component) // 导入组件
       }
     }
     if (route.children && route.children.length) {
       route.children = filterAsyncRouter(route.children)
     }
     return true
   })

   return accessedRouters
 }

4.最后一步，合并路由