vue-router 基于后端permissions动态生成导航菜单的示例代码

Vue.js

• vue-router
• vuex

1、注册全局守卫

核心逻辑
1、token身份验证(后端) => token失效返回登录页面
2、获取用户权限
3、校验permissions，动态添加路由菜单

router.beforeResolve 注册一个全局守卫。和 router.beforeEach 类似，区别是在导航被确认之前，同时在所有组件内守卫和异步路由组件被解析之后，解析守卫就被调用。

router.beforeResolve(async (to, from, next) => {
  let hasToken = store.getters['User/accessToken']
  if (!settings.loginInterception) hasToken = true
  if (hasToken) {
    if (to.path === '/auth/sign-in') {
      next({ path: '/' })
    } else {
      const hasPermissions =
        store.getters['User/permissions'] &&
        store.getters['User/permissions'].length > 0
      if (hasPermissions) {
        next()
      } else {
        try {
          let permissions
          if (!constant.loginInterception) {
            // settings.js loginInterception为false时，创建虚拟权限
            await store.dispatch('User/setPermissions', ['admin'])
            permissions = ['admin']
          } else {
            permissions = await store.dispatch('User/getUserInfo')
          }
          let accessRoutes = []
          accessRoutes = await store.dispatch('Routes/setRoutes', permissions)
          // 添加路由
          router.addRoutes(accessRoutes)
          next({ ...to, replace: true })
        } catch {
          await store.dispatch('User/resetAccessToken')
        }
      }
    }
  } else {
    if (settings.routesWhiteList.indexOf(to.path) !== -1) {
      next()
    } else {
      next('/auth/sign-in')
    }
  }
  document.title = getPageTitle(to.meta.title)
})

settings.js 全局设置

export default {
  // 是否开启登录拦截
  loginInterception: true,
  // 不经过token校验的路由
  routesWhiteList: ['/auth/sign-in', '/auth/register', '/401', '/404'],
}

2、Vuex状态管理 全局缓存routes

• state ：对数据的全局存储
• getter： 可以理解为computed ，对数据进行计算
• mutations ：对数据的同步更改
• actions：对数据的异步更改（实现异步操作）
• module： 将 store 分割成模块

/**
 * @author Alan
 * @description 路由拦截状态管理
 */
import { asyncRoutes, constantRoutes } from '@/router'
import { filterAsyncRoutes } from '@/Utils/handleRoutes'

const state = () => ({
  routes: [],
  partialRoutes: []
})
const getters = {
  routes: (state) => state.routes,
  partialRoutes: (state) => state.partialRoutes
}
const mutations = {
  setRoutes (state, routes) {
    state.routes = constantRoutes.concat(routes)
  },

  setPartialRoutes (state, routes) {
    state.partialRoutes = constantRoutes.concat(routes)
  }
}
const actions = {
  async setRoutes ({ commit }, permissions) {
    const finallyAsyncRoutes = await filterAsyncRoutes(
      [...asyncRoutes],
      permissions
    )
    commit('setRoutes', finallyAsyncRoutes)
    return finallyAsyncRoutes
  },
  setPartialRoutes ({ commit }, accessRoutes) {
    commit('setPartialRoutes', accessRoutes)
    return accessRoutes
  }
}
export default { namespaced: true, state, getters, mutations, actions }

3、路由拦截

/**
 * @author Alan
 * @description 判断当前路由是否包含权限
 * @param permissions
 * @param route
 * @returns {boolean|*}
 */
export function hasPermission (permissions, route) {
  if (route.meta && route.meta.permissions) {
    return permissions.some((role) => route.meta.permissions.includes(role))
  } else {
    return true
  }
}

/**
 * @author Alan
 * @description 根据permissions数组拦截路由
 * @param routes
 * @param permissions
 * @returns {[]}
 */
export function filterAsyncRoutes (routes, permissions) {
  const finallyRoutes = []
  routes.forEach((route) => {
    const item = { ...route }
    if (hasPermission(permissions, item)) {
      if (item.children) {
        item.children = filterAsyncRoutes(item.children, permissions)
      }
      finallyRoutes.push(item)
    }
  })
  return finallyRoutes
}

4、路由菜单

/*
* @author Alan
* @description 公共路由
*/
export const constantRoutes = [
  {
    path: '/auth',
    name: 'auth1',
    component: AuthLayout,
    children: authChildRoutes('auth1'),
    hidden: true // 隐藏菜单
  },
  {
    path: '/',
    name: 'dashboard',
    component: VerticleLayout,
    meta: {
      title: 'Dashboard',
      name: 'sidebar.dashboard',
      is_heading: false,
      is_active: false,
      link: '',
      class_name: '',
      is_icon_class: true,
      icon: 'ri-home-4-line',
      permissions: ['admin']
    },
    children: childRoutes('dashboard')
  }
]

/*
* @author Alan
* @description 异步路由
*/
export const asyncRoutes = [
  {
    path: '/menu-design',
    name: 'horizontal-dashboard',
    component: HorizantalLayout,
    meta: {
      title: 'Menu Design',
      name: 'sidebar.MenuDesign',
      is_heading: false,
      is_active: false,
      link: '',
      class_name: '',
      is_icon_class: true,
      icon: 'ri-menu-3-line',
      permissions: ['admin']
    },
    children: horizontalRoute('dashboard')
  }, {
    path: '/core',
    name: 'core',
    component: VerticleLayout,
    meta: {
      title: 'UI Elements',
      name: 'sidebar.uiElements',
      is_heading: false,
      is_active: false,
      class_name: '',
      link: '',
      is_icon_class: true,
      icon: 'ri-pencil-ruler-line',
      permissions: ['admin']
    },
    children: coreChildRoute('core')
  }
]

5、递归菜单vue组件

<template>
  <b-collapse tag="ul" :class="className" :visible="open" :id="idName" :accordion="accordianName">
    <li v-for="(item,index) in items" :key="index" :class=" !hideListMenuTitle? 'p-0' : item.meta.is_heading ? 'iq-menu-title' :activeLink(item) && item.children ? 'active' : activeLink(item) ? 'active' : ''">
      <template v-if="!item.hidden">
        <i v-if="item.meta.is_heading && hideListMenuTitle" class="ri-subtract-line" />
        <span v-if="item.meta.is_heading && hideListMenuTitle">{{ $t(item.meta.name) }}</span>
        <router-link :to="item.meta.link" v-if="!item.is_heading" :class="`iq-waves-effect ${activeLink(item) && item.children ? 'active' : activeLink(item) ? 'active' : ''}`" v-b-toggle="item.meta.name">
          <i :class="item.meta.icon" v-if="item.meta.is_icon_class"/>
          <template v-else v-html="item.meta.icon">
          </template>
          <span>{{ $t(item.meta.name) }}</span>
          <i v-if="item.children" class="ri-arrow-right-s-line iq-arrow-right" />
          <small v-html="item.meta.append" v-if="hideListMenuTitle" :class="item.meta.append_class" />
        </router-link>
        <List v-if="item.children" :items="item.children" :sidebarGroupTitle="hideListMenuTitle" :open="item.meta.link.name !== '' && activeLink(item) && item.children ? true : !!(item.meta.link.name !== '' && activeLink(item))" :idName="item.meta.name" :accordianName="`sidebar-accordion-${item.meta.class_name}`" :className="`iq-submenu ${item.meta.class_name}`" />
      </template>
    </li>
  </b-collapse>
</template>
<script>
import List from './CollapseMenu' // 自身组件
import { core } from '../../../config/pluginInit'
export default {
  name: 'List',
  props: {
    items: Array,
    className: { type: String, default: 'iq-menu' },
    open: { type: Boolean, default: false },
    idName: { type: String, default: 'sidebar' },
    accordianName: { type: String, default: 'sidebar' },
    sidebarGroupTitle: { type: Boolean, default: true }
  },
  components: {
    List
  },
  computed: {
    hideListMenuTitle () {
      return this.sidebarGroupTitle
    }
  },
  mounted () {
  },
  methods: {
    activeLink (item) {
      return core.getActiveLink(item, this.$route.name)
    }
  }
}
</script>

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