vuex + axios 做登录验证 并且保存登录状态的实例

// The Vue build version to load with the `import` command// (runtime-only or standalone) has been set in webpack.base.conf with an alias.import Vue from 'vue'import App from './App'import router from './router'import iView from 'iview';import 'iview/dist/styles/iview.css';import locale from 'iview/dist/locale/en-US';import VueParticles from 'vue-particles';import axios from 'axios' ;import Vuex from 'vuex' //引入状态管理 Vue.use(VueParticles) ;Vue.use(iView, { locale });Vue.config.productionTip = false ;Vue.prototype.$http = axios ;Vue.use(Vuex) ;  const ADD_COUNT = 'ADD_COUNT'; // 用常量代替事件类型，使得代码更清晰const REMOVE_COUNT = 'REMOVE_COUNT';//注册状态管理全局参数var store = new Vuex.Store({ state:{ token:'', userID:'', }, mutations: { //写法与getters相类似 //组件想要对于vuex 中的数据进行的处理 //组件中采用this.$store.commit('方法名') 的方式调用，实现充分解耦 //内部操作必须在此刻完成(同步) [ADD_COUNT] (state, token) { // 第一个参数为 state 用于变更状态 登录  sessionStorage.setItem("token", token);  state.token = token; }, [REMOVE_COUNT] (state, token) { // 退出登录   sessionStorage.removeItem("token", token);   state.token = token; }, }});  router.beforeEach((to, from, next) => { iView.LoadingBar.start();//loadong 效果  store.state.token = sessionStorage.getItem('token');//获取本地存储的token  if (to.meta.requireAuth) { // 判断该路由是否需要登录权限 if (store.state.token !== "") { // 通过vuex state获取当前的token是否存  next(); } else {  next({  path: '/login',  query: {redirect: to.fullPath} // 将跳转的路由path作为参数，登录成功后跳转到该路由  }) } } else { next(); }}) router.afterEach(route => { iView.LoadingBar.finish();});  /* eslint-disable no-new */new Vue({ el: '#app', router, store, //注册组件 components: { App }, template: '<App/>'}) ; 

this.$http({ method: 'get', url: '/api/login',}).then(function(res){ var json = res.data console.log(json.data); this.$Message.success('Success!');  this.$store.commit('ADD_COUNT', json.data.token);  let clock = window.setInterval(() => { this.totalTime-- ; if (this.totalTime < 0) {  window.clearInterval(clock) ;  this.$Loading.finish();  this.$router.push('/') ; } },1000)}.bind(this)).catch(function(err){ this.$Message.error('登录失败，错误：'+ err); this.$Loading.error();}.bind(this))

import Vue from 'vue'import Router from 'vue-router'import Login from '@/components/Login/Login'import P404 from '@/components/404/404'import Main from '@/components/Main' Vue.use(Router) export default new Router({ mode: 'history', routes: [ {  path: '/login',//登录页  name: 'Login',  component: Login }, {  path: '/',//首页  name: 'Main',  component: Main,  meta: {  requireAuth: true, // 添加该字段，表示进入这个路由是需要登录的  }, }, { path: '*', component: P404 } //这里是保证错误地址会跳转到404界面进行提示 ]})