第七次课：动态菜单-前端

参考：https://juejin.cn/post/7002874867167019045

修改路由文件

位置：src\router\index.js

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',
    name: '首页',
    hidden: true,
    children: [{
      path: 'dashboard',
      component: () => import('@/views/dashboard/index')
    }]
  },

]
const router = new Router({
  scrollBehavior: () => ({ y: 0 }),
  routes: constantRoutes
}
)
export default router

修改src\store\modules\user.js

const user = {
  state: {
    token: getToken(),
    name: '',
    avatar: '',
    roles: [],//角色权限控制按钮显示
    menus: [] // 菜单权限
  },

  mutations: {
    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
    },
    SET_MENUS: (state, menus) => {
      state.menus = menus // 菜单权限
    }
  },

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

    // 获取用户信息
    GetInfo({ commit, state }) {
      return new Promise((resolve, reject) => {
        getInfo(state.token).then(response => {

         
          const data = response.data
          if (data.roles && data.roles.length > 0) { // 验证返回的roles是否是一个非空数组
            commit('SET_ROLES', data.roles)
          } else {
            reject('getInfo: roles must be a non-null array !')
          }
             /**
        * 获取异步路由后加入404路由能解决刷新后【丢失路由跳转404页面】问题
        （因为异步获取路由优先级比静态路由表低，导致404路由在异步添加的路由之前）
        */
        const menus= data.menus
        menus.push( {
          'path': '*',
          'redirect': '/404',
          'hidden': 'true'
        })
          commit('SET_NAME', data.username)
          commit('SET_AVATAR', data.avatar)
          commit('SET_MENUS', data.menus) // 菜单权限
          resolve(response)
        }).catch(error => {
          reject(error)
        })
      })
    },

主要改的地方：

修改getters.js存储信息

位置：src\store\getters.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,// 角色权限控制按钮
  menus: state => state.user.menus, // 菜单权限

}
export default getters

修改permission.js的vuex导航守卫

自学：https://router.vuejs.org/zh/guide/advanced/navigation-guards.html

位置：src\permission.js

注意：引入Layout

import router from './router'
import store from './store'
import NProgress from 'nprogress' // Progress 进度条
import 'nprogress/nprogress.css'// Progress 进度条样式
import { Message } from 'element-ui'
import { getToken } from '@/utils/auth' // 验权
import Layout from '@/views/layout/Layout'// 引入Layout

const whiteList = ['/login'] // 不重定向白名单
router.beforeEach((to, from, next) => {

  //to 目标菜单
  //form 源头
  //next 放行
  NProgress.start()//进度条
  if (getToken()) {
    if (to.path === '/login') {
      next({ path: '/' })
      NProgress.done() // if current page is dashboard will not trigger	afterEach hook, so manually handle it
    } else {
      if (store.getters.roles.length === 0) {
        store.dispatch('GetInfo').then(res => { //请求 用户基本信息的接口

          //就可以拿到当前登录者的菜单 
          // **在这里做动态路由**
          if (store.getters.menus.length < 1) {
            global.antRouter = []
            next()
          }
          //store.getters.menus是长啥样？？？

          const menus = filterAsyncRouter(store.getters.menus) // 过滤路由
          router.addRoutes(menus) // 动态添加路由
          global.antRouter = menus // 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 })
          
        }).catch((err) => {
          store.dispatch('FedLogOut').then(() => {
            Message.error(err || 'Verification failed, please login again')
            next({ path: '/' })
          })
        })
      } else {
        next()
      }
    }
  } else {
    if (whiteList.indexOf(to.path) !== -1) {
      next()
    } else {
      next(`/login?redirect=${to.path}`) // 否则全部重定向到登录页
      NProgress.done()//进度条结束
    }
  }
})

function filterAsyncRouter(asyncRouterMap) { // 遍历后台传来的路由字符串，转换为组件对象
  try {
    const accessedRouters = asyncRouterMap.filter(route => {
      if (route.component) {
        if (route.component === 'Layout') { // Layout组件特殊处理
          route.component = Layout
        } else {
          const component = route.component
          route.component = resolve => {
            require(['@/views' + component + '.vue'], resolve)
          }
        }
      }
      if (route.children && route.children.length) {
        route.children = filterAsyncRouter(route.children)
      }
      return true
    })
    return accessedRouters
  } catch (e) {
    console.log(e)
  }
}

router.afterEach(() => {
  NProgress.done() // 结束Progress
})

替换成动态路由

位置：src\views\layout\components\Sidebar\index.vue

routes() {
      return this.$router.options.routes.concat(global.antRouter) // 新路由连接
      
    },

json-server学习

作为一个前端开发工程师，在后端还没有ready的时候，不可避免的要使用mock的数据。很多时候，我们并不想使用简单的静态数据，而是希望自己起一个本地的mock-server来完全模拟请求以及请求回来的过程。json-server是一个很好的可以替我们完成这一工作的工具。我们只需要提供一个json文件，或者写几行简单的js脚本就可以模拟出RESTful API的接口。

参考文章：https://blog.csdn.net/weixin_40817115/article/details/81237128

准备工作

1.安装json-server

npm install -g json-server

2.查看版本

json-server -v

3.新建一个json文件db.json

{
  "student": [
    {
      "id": 1,
      "stuno": "20190115",
      "name": "张三",
      "phone": "15336514240",
      "score": {
        "yuwen": 80,
        "shuxue": 50
      }
    },
    {
      "id": 2,
      "stuno": "20190116",
      "name": "李四",
      "phone": "15336514250",
      "score": {
        "yuwen": 50,
        "shuxue": 90
      }
    },
    {
      "id": 3,
      "stuno": "20190117",
      "name": "王五",
      "phone": "15336515240",
      "score": {
        "yuwen": 50,
        "shuxue": 100
      }
    },
    {
      "stuno": "20190115",
      "name": "王健林",
      "phone": "15336515241",
      "score": {
        "yuwen": 90,
        "shuxue": 50
      },
      "id": 5
    },
    {
      "stuno": "20190118",
      "name": "马云",
      "phone": "15336515241",
      "score": {
        "yuwen": 90,
        "shuxue": 50
      },
      "id": 6
    }
  ]
}

4.启动json-server

json-server db.json

增：添加一条学生的记录

http://localhost:3000/student/

{
	"stuno": "20190118",
    "name": "马云",
    "phone": "15336515241",
    "score": {
        "yuwen":90,
        "shuxue": 50
    }
 }

删除一条记录

http://localhost:3000/student/4

修改一条记录

修改id为5的学生信息

发送put请求

http://localhost:3000/student/5

查id为1的学生信息

发送get请求http://localhost:3000/student/1

查李四的信息

http://localhost:3000/student/?name=李四

查询语文成绩大于等于80的学生

http://localhost:3000/student/?score.yuwen_gte=80

查询所有学生的信息和成绩

get请求http://localhost:3000/student/

模拟后台user接口

为了方便调试，可以先把响应拦截器的代码屏蔽

位置:src\utils\request.js

准备db.json文件

{
  "data":{
    "username":"admin",
    "roles":[
      {
        "id":null,
        "roleName":"超级管理员",
        "roleCode":"ROLE_admin",
        "remark":null,
        "isDeleted":null,
        "eduCreate":null,
        "eduModified":null
      }
    ],
    "avatar":"http://vue.ruoyi.vip/static/img/profile.473f5971.jpg",
    "menus":[
      {
        "redirect":"noredirect",
        "path":"/acl",
        "component":"Layout",
        "hidden":false,
        "children":[
          {
            "path":"user/list",
            "component":"/acl/user/list",
            "hidden":false,
            "meta":{
              "title":"后台用户"
            },
            "name":"name_3"
          },
          {
            "path":"role/list",
            "component":"/acl/role/list",
            "hidden":false,
            "meta":{
              "title":"角色管理"
            },
            "name":"name_4"
          },
          {
            "path":"menu/list",
            "component":"/acl/menu/list",
            "hidden":false,
            "meta":{
              "title":"菜单管理"
            },
            "name":"name_5"
          }
        ],
        "meta":{
          "icon":"example",
          "title":"权限管理"
        },
        "name":"name_2"
      },
      {
        "redirect":"noredirect",
        "path":"/teacher",
        "component":"Layout",
        "hidden":false,
        "children":[
          {
            "path":"/list",
            "component":"/teacher/list",
            "hidden":false,
            "meta":{
              "title":"讲师列表"
            },
            "name":"name_7"
          },
          {
            "path":"/save",
            "component":"/teacher/save",
            "hidden":false,
            "meta":{
              "title":"添加讲师"
            },
            "name":"name_8"
          }
        ],
        "meta":{
          "icon":"example",
          "title":"讲师管理"
        },
        "name":"name_6"
      }
    ]
  }
}

修改接口

位置：src\api\login.js

export function getInfo(token) {

  return request({
    url: 'http://localhost:3000/data',
    // url: '/acl/user/info',
    method: 'get',
    params: { token }
  })
}

特别注意

注意： redirect: 'noredirect',

这里的noredirect不能写成noRedirect，官网写的是错的……

另外就是刷新当前页面要么是空白页要么是404，烦人的很

解决如下：