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

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)
      })
    })
  }

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

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