vue-admin-template添加permission模块实现动态路由

1. 首先在src/permission.js 中修改登录权限判断，并根据权限动态加载路由

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

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

  // 确定用户是否已登录
  const hasToken = getToken()

  if (hasToken) {
    if (to.path === '/login') {
      // 如果已登录，直接重定向到主页
      next({ path: '/' })
      NProgress.done()
    } else {
      // 确定用户是否已通过getInfo获得其权限角色
      // 1. 这里需要确定store.getter.roles在store中存在 要不会死循环的
      const hasRoles = store.getters.roles && store.getters.roles.length > 0
      if (hasRoles) {
        next()
      } else {
        try {
          //获取用户信息
          //注意：角色必须是对象数组！例如：['admin']或，['developer'，'editor']
          const { roles } = await store.dispatch('user/getInfo')

          //根据角色生成可访问的路由
          const accessRoutes = await store.dispatch('permission/generateRoutes', roles)

          //动态添加可访问的路由
          router.addRoutes(accessRoutes)
          // 设置replace:true，这样导航就不会留下历史记录  以防用户点击后退报错
          next({ ...to, replace: true })
        } 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()
    }
  }
})

2. 在store/moudel/user.js中 修改

import { login, logout, getInfo } from '@/api/user'
import { getToken, setToken, removeToken } from '@/utils/auth'
import { resetRouter } from '@/router'

const getDefaultState = () => {
  return {
    token: getToken(),
    name: '',
    avatar: '',
    roles: [] //用于存储用户角色信息
  }
}

const state = getDefaultState()

const mutations = {
  RESET_STATE: (state) => {
    Object.assign(state, getDefaultState())
  },
  SET_TOKEN: (state, token) => {
    state.token = token
  },
  SET_NAME: (state, name) => {
    state.name = name
  },
  SET_AVATAR: (state, avatar) => {
    state.avatar = avatar
  },
  SET_ROLES: (state, roles) => {
    state.roles = roles
  }
}

const actions = {
  // user login
  login({ commit }, userInfo) {
    const { username, password } = userInfo
    return new Promise((resolve, reject) => {
      login({ username: username.trim(), password: password }).then(response => {
        const { data } = response
        commit('SET_TOKEN', data.token)
        setToken(data.token)
        resolve()
      }).catch(error => {
        reject(error)
      })
    })
  },

  // 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.')
        }

        const { roles, name, avatar } = data

        // roles must be a non-empty array
        if (!roles || roles.length <= 0) {
          reject('getInfo: roles must be a non-null array!')
        }

        commit('SET_ROLES', roles)
        commit('SET_NAME', name)
        commit('SET_AVATAR', avatar)
        resolve(data)
      }).catch(error => {
        reject(error)
      })
    })
  },

  // user logout
  logout({ commit, state }) {
    return new Promise((resolve, reject) => {
      logout(state.token).then(() => {
        removeToken() // must remove  token  first
        resetRouter()
        commit('RESET_STATE')
        resolve()
      }).catch(error => {
        reject(error)
      })
    })
  },

  // remove token
  resetToken({ commit }) {
    return new Promise(resolve => {
      removeToken() // must remove  token  first
      commit('RESET_STATE')
      resolve()
    })
  }
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}

3. 修改store/getter.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,
  roles: state => state.user.roles,
  permission_routes: state => state.permission.routes
}

4. 在router中设置需要动态添加的路由

import Vue from 'vue'
import Router from 'vue-router'

Vue.use(Router)

/* Layout */
import Layout from '@/layout'


/**
 * constantRoutes
 * a base page that does not have permission requirements
 * all roles can be accessed
 */
export const constantRoutes = [
  {
    path: '/login',
    component: () => import('@/views/login/index'),
    hidden: true
  },

  {
    path: '/404',
    component: () => import('@/views/404'),
    hidden: true
  },

  {
    path: '/',
    component: Layout,
    redirect: '/dashboard',
    children: [{
      path: 'dashboard',
      name: 'Dashboard',
      component: () => import('@/views/dashboard/index'),
      meta: { title: 'Dashboard', icon: 'dashboard' }
    }]
  },

  {
    path: '/example',
    component: Layout,
    redirect: '/example/table',
    name: 'Example',
    meta: { title: 'Example', icon: 'el-icon-s-help' },
    children: [
      {
        path: 'table',
        name: 'Table',
        component: () => import('@/views/table/index'),
        meta: { title: 'Table', icon: 'table' }
      },
      {
        path: 'tree',
        name: 'Tree',
        component: () => import('@/views/tree/index'),
        meta: { title: 'Tree', icon: 'tree' }
      }
    ]
  },

  {
    path: '/form',
    component: Layout,
    children: [
      {
        path: 'index',
        name: 'Form',
        component: () => import('@/views/form/index'),
        meta: { title: 'Form', icon: 'form' }
      }
    ]
  }
]

/**
 * asyncRoutes
 * the routes that need to be dynamically loaded based on user roles
 */
export const asyncRoutes = [
  {
    path: '/nested',
    component: Layout,
    redirect: '/nested/menu1',
    name: 'Nested',
    meta: {
      title: 'Nested',
      icon: 'nested'
    },
    children: [
      {
        path: 'menu1',
        component: () => import('@/views/nested/menu1/index'), // Parent router-view
        name: 'Menu1',
        meta: { title: 'Menu1' },
        children: [
          {
            path: 'menu1-1',
            component: () => import('@/views/nested/menu1/menu1-1'),
            name: 'Menu1-1',
            meta: { title: 'Menu1-1' }
          },
          {
            path: 'menu1-2',
            component: () => import('@/views/nested/menu1/menu1-2'),
            name: 'Menu1-2',
            meta: { title: 'Menu1-2' },
            children: [
              {
                path: 'menu1-2-1',
                component: () => import('@/views/nested/menu1/menu1-2/menu1-2-1'),
                name: 'Menu1-2-1',
                meta: { title: 'Menu1-2-1' }
              },
              {
                path: 'menu1-2-2',
                component: () => import('@/views/nested/menu1/menu1-2/menu1-2-2'),
                name: 'Menu1-2-2',
                meta: { title: 'Menu1-2-2' }
              }
            ]
          },
          {
            path: 'menu1-3',
            component: () => import('@/views/nested/menu1/menu1-3'),
            name: 'Menu1-3',
            meta: { title: 'Menu1-3' }
          }
        ]
      },
      {
        path: 'menu2',
        component: () => import('@/views/nested/menu2/index'),
        meta: { title: 'menu2' }
      }
    ]
  },

  {
    path: 'external-link',
    component: Layout,
    children: [
      {
        path: 'https://panjiachen.github.io/vue-element-admin-site/#/',
        meta: { title: 'External Link', icon: 'link' }
      }
    ]
  },

  // 404 page must be placed at the end !!!
  { path: '*', redirect: '/404', hidden: true }
]

const createRouter = () => new Router({
  // mode: 'history', // require service support
  scrollBehavior: () => ({ y: 0 }),
  routes: constantRoutes
})

const router = createRouter()

// Detail see: https://github.com/vuejs/vue-router/issues/1234#issuecomment-357941465
export function resetRouter() {
  const newRouter = createRouter()
  router.matcher = newRouter.matcher // reset router
}

export default router

5. 至此动态路由大体完成，还差最后一步，让自动生成的路由在页面显示，这里需要修改
   layout/sidebar/index.vue

<sidebar-item v-for="route in permission_routes" :key="route.path" :item="route" :base-path="route.path" />

computed: {
    ...mapGetters([
      'permission_routes',
      'sidebar'
    ]),
}

OK,侧边栏也好了！