vue2模拟vue-element-admin手写角色权限的实现，

vue2模拟vue-element-admin手写角色权限的实现，

目录

• 权限
• 路由权限
• store存储路由
• router添加路由
• 菜单权限
• 按钮权限
• 准备：存储按钮标识
• 指令
• 函数

权限

路由权限

• 静态路由：固定的路由，没有权限。如login页面
• 动态路由：根据不同的角色，后端返回不同的路由接口。通过meta中的roles去做筛选

store存储路由

//地址：store/modules/permission
import { routes as constantRoutes } from '@/router'
​
// 根据meta.roles去判断该角色是否有路由权限
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return route.meta.roles.some(val => val === roles)
  }
  return true
}
​
/**
 * 递归动态路由
 * @param routes 动态路由
 * @param roles 角色
 */
export function filterAsyncRoutes(routes, roles) {
  const res = []
  routes.forEach(route => {
    const tmp = { ...route }
    if (hasPermission(roles, tmp)) {
      if (tmp.children) {
        //后台传来的路由字符串，转换为组件对象
        //       let a = `../views/${route.component}`;
        //       route.component = () => import(a); // 导入组件
        tmp.children = filterAsyncRoutes(tmp.children, roles)
      }
      res.push(tmp)
    }
  })
​
  return res
}
​
//模拟后端传过来的路由
export const asyncRoutes = [
  {
    path: '/',
    name: 'home',
    redirect: '/PickupTask',
    meta: {
      title: '首页',
      //纯前端去做动态路由
      roles: ['admin']
    },
    component: () => import('@/views/HomeView.vue'),
    children: [
      {
        path: 'PickupTask',
        name: 'PickupTask',
        meta: {
          title: 'PickupTask',
        },
        component: () => import('@/views/Sd/PickupTask.vue'),
      },
      {
        path: 'access',
        hidden: true,
        component: () => import('@/views/demo/Access.vue'),
        meta: {
          title: 'access',
          roles: ['admin'],
          //按钮权限标识
          button: {
            'btn:access:createUser': 'hidden',
            'btn:access:editUser': 'disable'
          },
        },
      },
    ],
  }
]
​
const permisssion = {
  // namespaced: true, -> store.dispatch('permisssion/generateRoutes', 'admin');
  state: {
    //静态路由+动态路由
    routes: [],
    //动态路由
    addRoutes: []
  },
  mutations: {
    SET_ROUTES: (state, routes) => {
      state.addRoutes = routes
      state.routes = constantRoutes.concat(routes)
    }
  },
  actions: {
    generateRoutes({ commit }, roles) {
      return new Promise(resolve => {
        let accessedRoutes = filterAsyncRoutes(asyncRoutes, roles)
        commit('SET_ROUTES', accessedRoutes)
        resolve(accessedRoutes)
      })
    }
  }
}
​
export default permisssion

router添加路由

将store中的动态路由使用addRoute添加(最新版本去掉了addRoutes只能使用addRoute添加路由)。

//地址：router/index
import Vue from 'vue';
import VueRouter, { RouteConfig } from 'vue-router';
import store from '@/store';
​
Vue.use(VueRouter);
​
const isProd = process.env.NODE_ENV === 'production';
const routerContext = require.context('./', true, /index.js$/);
//静态路由
export let routes: any = [];
​
routerContext.keys().forEach((route) => {
  // route就是路径
  // 如果是根目录的index不做处理
  if (route.startsWith('./index')) {
    return;
  }
  const routerModule = routerContext(route);
  routes = [...routes, ...(routerModule.default || routerModule)];
});
​
// 创建 router 实例，然后传 `routes` 配置
const router = new VueRouter({
  mode: 'history',
  base: isProd ? '/vue-demo/' : process.env.BASE_URL,
  routes,
  scrollBehavior(to, from, savedPosition) {
    if (to.hash) {
      return {
        selector: to.hash,
      };
    }
  },
});
​
let registerRouteFresh = true;
/**
 * 全局全局前置守卫
 * to : 将要进入的目标路由对象
 * from : 即将离开的目标路由对象
 */
router.beforeEach(async (to: any, from, next) => {
  //设置当前页的title
  document.title = to.meta.title;
  if (to.path === '/login' && localStorage.getItem('token')) {
    next('/');
  }
  console.log(registerRouteFresh);
  //如果首次或者刷新界面，next(...to, replace: true)会循环遍历路由，
  //如果to找不到对应的路由那么他会再执行一次beforeEach((to, from, next))直到找到对应的路由，
  //我们的问题在于页面刷新以后异步获取数据，直接执行next()感觉路由添加了但是在next()之后执行的，
  //所以我们没法导航到相应的界面。这里使用变量registerRouteFresh变量做记录，直到找到相应的路由以后，把值设置为false然后走else执行next(),整个流程就走完了，路由也就添加完了。
  if (registerRouteFresh) {
    //设置路由
    const accessRoutes = await store.dispatch('generateRoutes', 'admin');
    let errorPage = {
      path: '*',
      name: '404',
      component: () => import('../views/404.vue'),
    };
    // 将404添加进去
    // 现在才添加的原因是：作为一级路由，当刷新，动态路由还未加载，路由就已经做了匹配，找不到就跳到了404
    router.addRoute({ ...errorPage });
    accessRoutes.forEach((item: RouteConfig) => {
      router.addRoute(item);
    });
    //获取路由配置
    console.log(router.getRoutes());
    //通过next({...to, replace})解决刷新后路由失效的问题
    next({ ...to, replace: true });
    registerRouteFresh = false;
  } else {
    next();
  }
  next();
});
​
export default router;

菜单权限

路由遍历，通过store路由权限中的permission.state.routes去做处理

按钮权限

准备：存储按钮标识

//地址：store/modules/user
import {
  userInfo,
} from '@/api'
​
const user = {
  state: {
    role: 'admin',
    mockButton: {
      'btn:access:createUser': 'show',
      'btn:access:editUser': 'show'
    }
  },
  //更改 Vuex 的 store 中的状态的唯一方法是提交 mutation
  mutations: {
    change_role: (state, data) => {
      state.role = data.role
    },
    change_btn: (state, data) => {
      state.mockButton = data.mockButton
    }
  },
}
​
export default user

指令

通过模拟传入按钮标识的属性，去判断按钮是否隐藏或者禁用

//地址：directive/permission/index
import permission from './permissionBtn'
​
const install = function(Vue) {
  Vue.directive('permission', permission)
}
​
if (window.Vue) {
  window['permission'] = permission
  Vue.use(install); // eslint-disable-line
}
​
permission.install = install
export default permission

//地址：directive/permission/permissionBtn
import store from '@/store'
​
function checkPermission(el, binding) {
  const { value } = binding
  const roles = store.getters && store.getters.role
  // 获取模拟权限按钮标识
  const mockButton = store.getters && store.getters.mockButton
  // 设置按钮属性
  if (mockButton[value] === 'disabled') {
    el.disabled = true
    el.setAttribute('disabled', true)
  }
​
  if (mockButton[value] === 'hidden') {
    el.style.display = 'none'
  }
  if (mockButton[value] === 'show') {
    el.style.display = 'block'
    el.disabled = false
  }
  // throw new Error(`need roles! Like v-permission="['admin','editor']"`)
}
​
export default {
  inserted(el, binding) {
    checkPermission(el, binding)
  },
  update(el, binding) {
    checkPermission(el, binding)
  }
}

//应用

<template>
  <div>
    <a-button @click="changeRole">切换角色</a-button>
    <span>当前角色：{{ role }}</span>
    <!-- 注意一定要加disabled属性，才能设置它的disabled值 -->
    <a-button :disabled="false" v-permission="'btn:access:createUser'">
      新建用户
    </a-button>
    <a-button :disabled="false" v-permission="'btn:access:editUser'">
      编辑用户
    </a-button>
  </div>
</template>
​
<script lang='ts'>
import { Vue, Component, Watch } from "vue-property-decorator";
import permission from "@/directive/permission/index.js"; // 权限判断指令
// import checkPermission from '@/utils/permission' // 权限判断函数
@Component({
  directives: {
    permission,
  },
  computed: {
    role() {
      return this.$store.getters.role;
    },
  },
})
export default class Access extends Vue {
  get role() {
    return this.$store.getters.role;
  }
​
  changeRole() {
    //设置按钮权限
    this.$store.commit("change_btn", {
      mockButton:
        this.role === "admin"
          ? {
              "btn:access:createUser": "hidden",
              "btn:access:editUser": "disabled",
            }
          : {
              "btn:access:createUser": "show",
              "btn:access:editUser": "show",
            },
    });
    //设置角色
    this.$store.commit("change_role", {
      role: this.role === "admin" ? "edit" : "admin",
    });
  }
}
</script>

函数

/**
 * @param {Array} value
 * @returns {Boolean}
 * @example see @/views/permission/directive.vue
 * 除了使用指令，也可以使用函数
 */
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)
    })
    return hasPermission
  }
    console.error(`need roles! Like v-permission="['admin','editor']"`)
    return false
​
}

<template>
  <div>
    <a-button
      v-if="hasPerms('btn:access:createUser')"
      :disable="hasPerms('btn:access:createUser')"
    >
      新建用户
    </a-button>
    <a-button
      v-if="hasPerms('btn:access:editUser')"
      :disable="hasPerms('btn:access:editUser')"
    >
      编辑用户
    </a-button>
  </div>
</template>
​
<script lang='ts'>
import { Vue, Component, Watch } from "vue-property-decorator";
import checkPermission from "@/utils/permission"; // 权限判断函数
@Component
export default class Access extends Vue {
  hasPerms(params) {
    return checkPermission(params);
  }
}
</script>

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