来源    https://www.jianshu.com/p/e50633a9005e

前端框架是基于vue-element-admin的  

项目地址 https://github.com/PanJiaChen/vue-element-admin

实现思路就是从后台根据用户查询用户所分配的所有按钮权限 每一个按钮都有标识

然后放进store中

定义全局变量 在页面按钮做匹配,判断按钮传入的是否在store中存在  存在就显示 不存在就不显示.具体实现步骤如下

标红部分代码是关于前端按钮部分的

文件地址 src/store/modules/user.js

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

import {
  setStore,
  getStore,
  removeStore
} from '@/utils/store'

const state = {
  token: getToken(),
  name: '',
  avatar: '',
  introduction: '',
  buttons: [],
  roles: [],
  isLock: getStore({
    name: 'isLock'
  }) || false,
  lockPasswd: getStore({
    name: 'lockPasswd'
  }) || ''
}

const mutations = {
  SET_TOKEN: (state, token) => {
    state.token = token
  },
  SET_INTRODUCTION: (state, introduction) => {
    state.introduction = introduction
  },
  SET_DEPTID: (state, deptId) => {
    state.deptId = deptId
  },
  SET_NAME: (state, name) => {
    state.name = name
  },
  SET_AVATAR: (state, avatar) => {
    state.avatar = avatar
  },
  SET_BUTTONS: (state, buttons) => {
    state.buttons = buttons
  },
  SET_ROLES: (state, roles) => {
    state.roles = roles
  },
  SET_LOCK_PASSWD: (state, lockPasswd) => {
    state.lockPasswd = lockPasswd
    setStore({
      name: 'lockPasswd',
      content: state.lockPasswd,
      type: 'session'
    })
  },
  SET_LOCK: (state, action) => {
    state.isLock = true
    setStore({
      name: 'isLock',
      content: state.isLock,
      type: 'session'
    })
  },
  CLEAR_LOCK: (state, action) => {
    state.isLock = false
    state.lockPasswd = ''
    removeStore({
      name: 'lockPasswd'
    })
    removeStore({
      name: 'isLock'
    })
  }
}

const actions = {
  // user login
  login({ commit }, userInfo) {
    const username = userInfo.username.trim()
    const validateCode = userInfo.validateCode.trim()
    return new Promise((resolve, reject) => {
      login(username, userInfo.password, validateCode).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, introduction, deptId, buttons } = data

        // roles must be a non-empty array
        if (!roles || roles.length <= 0) {
          reject('getInfo: roles must be a non-null array!')
        }
        const buttonAuthList = []
        buttons.forEach(button => {
          if (button.perms) {
            buttonAuthList.push(button.perms)
          }
        })
        // alert(JSON.stringify(buttonAuthList) + '--' + buttonAuthList.length)
        commit('SET_ROLES', roles)
        commit('SET_NAME', name)
        commit('SET_AVATAR', avatar)
        commit('SET_INTRODUCTION', introduction)
        commit('SET_DEPTID', deptId)
        commit('SET_BUTTONS', buttonAuthList)
        resolve(data)
      }).catch(error => {
        reject(error)
      })
    })
  },

  // user logout
  logout({ commit, state }) {
    return new Promise((resolve, reject) => {
      logout(state.token).then(() => {
        commit('SET_TOKEN', '')
        commit('SET_ROLES', [])
        commit('SET_BUTTONS', [])
        removeToken()
        resetRouter()
        resolve()
      }).catch(error => {
        reject(error)
      })
    })
  },

  // remove token
  resetToken({ commit }) {
    return new Promise(resolve => {
      commit('SET_TOKEN', '')
      commit('SET_ROLES', [])
      commit('SET_BUTTONS', [])
      removeToken()
      resolve()
    })
  },

  // dynamically modify permissions
  changeRoles({ commit, dispatch }, role) {
    return new Promise(async resolve => {
      const token = role + '-token'

      commit('SET_TOKEN', token)
      setToken(token)

      const { roles } = await dispatch('getInfo')

      resetRouter()

      // generate accessible routes map based on roles
      const accessRoutes = await dispatch('permission/generateRoutes', roles, { root: true })

      // dynamically add accessible routes
      router.addRoutes(accessRoutes)

      // reset visited views and cached views
      dispatch('tagsView/delAllViews', null, { root: true })

      resolve()
    })
  }
}

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

文件地址 : src/store/getters.js

const getters = {
  sidebar: state => state.app.sidebar,
  language: state => state.app.language,
  size: state => state.app.size,
  device: state => state.app.device,
  visitedViews: state => state.tagsView.visitedViews,
  cachedViews: state => state.tagsView.cachedViews,
  token: state => state.user.token,
  avatar: state => state.user.avatar,
  name: state => state.user.name,
  deptId: state => state.user.deptId,
  introduction: state => state.user.introduction,
  roles: state => state.user.roles,
  buttons: state => state.user.buttons,
  permission_routes: state => state.permission.routes,
  isLock: state => state.user.isLock,
  lockPasswd: state => state.user.lockPasswd,
  errorLogs: state => state.errorLog.logs
}
export default getters

路径 src/utils/permission.js

import store from '@/store'

/**
 * @param {Array} value
 * @returns {Boolean}
 * @example see @/views/permission/directive.vue
 */
export default function checkPermission(value) {
  if (value && value instanceof Array && value.length > 0) {
    const roles = store.getters && store.getters.roles
    const permissionRoles = value

    const hasPermission = roles.some(role => {
      return permissionRoles.includes(role)
    })

    if (!hasPermission) {
      return false
    }
    return true
  } else {
    console.error(`need roles! Like v-permission="['admin','editor']"`)
    return false
  }
}

// 用来控制按钮的显示
export function hasBtnPermission(permission) {
  const myBtns = store.getters.buttons
  return myBtns.indexOf(permission) > -1
}

文件路径 src/main.js

import Vue from 'vue'

import Cookies from 'js-cookie'

import 'normalize.css/normalize.css' // a modern alternative to CSS resets

import Element from 'element-ui'
import './styles/element-variables.scss'

import '@/styles/index.scss' // global css

import App from './App'
import store from './store'
import router from './router'

import i18n from './lang' // internationalization
import './icons' // icon
import './permission' // permission control
import './utils/error-log' // error log

import * as filters from './filters' // global filters
import { hasBtnPermission } from './utils/permission' // button permission
/**
 * If you don't want to use mock-server
 * you want to use MockJs for mock api
 * you can execute: mockXHR()
 *
 * Currently MockJs will be used in the production environment,
 * please remove it before going online! ! !
 */
// import { mockXHR } from '../mock'
// if (process.env.NODE_ENV === 'production') {
//   mockXHR()
// }

Vue.use(Element, {
  size: Cookies.get('size') || 'medium', // set element-ui default size
  i18n: (key, value) => i18n.t(key, value)
})

// register global utility filters
Object.keys(filters).forEach(key => {
  Vue.filter(key, filters[key])
})

Vue.config.productionTip = false
Vue.prototype.hasPerm = hasBtnPermission

new Vue({
  el: '#app',
  router,
  store,
  i18n,
  render: h => h(App)
})

接下来就是页面调用了 

<!--列表-->
<el-table class="table-data" :data="posts" highlight-current-row style="width: 100%;" @selection-change="selsChange">
  <el-table-column type="selection" width="55" />
  <el-table-column prop="postCode" label="岗位编码" width="300" />
  <el-table-column prop="postName" label="岗位名称" width="450" />
  <el-table-column prop="postSort" label="显示顺序" width="150" />
  <el-table-column prop="status" label="状态" width="150">
    <template slot-scope="scope">
      <span v-if="scope.row.status==='0'" class="row-status color-green">正常</span>
      <span v-if="scope.row.status==='1'" class="row-status color-red">停用</span>
    </template>
  </el-table-column>
  <el-table-column prop="createTime" label="创建时间" min-width="150" />
  <el-table-column label="操作" width="200">
    <template slot-scope="scope">
      <el-button v-if="hasPerm('system:post:edit')" size="small" @click="handleEdit(scope.$index, scope.row)"><i class="el-icon-edit" />编辑</el-button>
      <el-button v-if="hasPerm('system:post:remove')" type="danger" size="small" @click="handleDel(scope.$index, scope.row)"><i class="el-icon-delete" />删除</el-button>
    </template>
  </el-table-column>
</el-table>