解决vue刷新页面以后丢失store的数据问题

export default {
 name: 'app',
 created () {
  // 在页面加载时读取sessionStorage
  if (sessionStorage.getItem('store')) {
   this.$store.replaceState(Object.assign({}, this.$store.state, JSON.parse(sessionStorage.getItem('store'))))
  }
  // 在页面刷新时将store保存到sessionStorage里
  window.addEventListener('beforeunload', () => {
   sessionStorage.setItem('store', JSON.stringify(this.$store.state))
  })
 }
}

// 封装操作localstorage本地存储的方法 模块化

var storage = {
  set(key, value) {
    localStorage.setItem(key, JSON.stringify(value));
    // localStorage.key = value;
    // localStorage[key] = value;
  },
  get(key) {
    return JSON.parse(localStorage.getItem(key));
  },
  getForIndex(index) {
    return localStorage.key(index);
  },
  getKeys(){
    let items = this.getAll();
    let keys = [];
    for (let index=0;index<items.length;index++){
      keys.push(items[index].key);
    }
    return keys;
  },
  getLength() {
    return localStorage.length;
  },
  getSupport() {
    return (typeof (Storage) !== "undefined") ? true : false;
  },
  remove(key) {
    localStorage.removeItem(key);
  },
  removeAll() {
    localStorage.clear();
  },
  getAll() {
    let len = localStorage.length; // 获取长度
    let arr = new Array(); // 定义数据集
    for (var i = 0; i < len; i++) {
      // 获取key 索引从0开始
      var getKey = localStorage.key(i);
      // 获取key对应的值
      var getVal = localStorage.getItem(getKey);
      // 放进数组
      arr[i] = {
        'key': getKey,
        'val': getVal,
      }
    }
    return arr;
  }
}

export default storage;

import Vue from 'vue'
import Vuex from 'vuex'
import storage from '@/model/storage'

Vue.use(Vuex);
// 用Vuex.Store对象用来记录token
const store = new Vuex.Store({

 state: {
  // 存储token
  // token: storage.get('token') ? storage.get('token') : '',
  token:"",
  userName:"" // 可选
 },

 actions: {
  // removeToken: () => {
   // context.commit('set_token')
  // }
 },

 // 计算属性
 mutations: {
  // 修改token，并将token存入localStorage
  set_token(state,token) {
   state.token = token;
   storage.set('token', token);
   console.log('store、localstorage保存token成功！');
  },
  del_token(state) {
   state.token = "";
   storage.remove("token");
  },
  // 可选
  setUserInfo(state, userName) {
   state.userName = userName;
  }
 }
});

export default store;

import axios from 'axios'
import store from '@/store'
import router from '@/router'

// create an axios instance
const service = axios.create({
  // index.js设置了代理(解决跨域) invoice = http://58.246.79.142:25005
  baseURL: "/invoice", // url = base url + request url
  timeout: 5000, // request timeout
  }

})

//添加请求拦截器，若token存在则在请求头中加token，不存在也继续请求
service.interceptors.request.use(
  config => {
    // 每次发送请求之前检测都vuex存有token,那么都要放在请求头发送给服务器,没有则不带token
    // Authorization是必须的
    if (store.state.token) {
      config.headers.Authorization = store.state.token;
    }
    return config;
  },
  error => {
    console.log("在request拦截器显示错误：", error.response)
    return Promise.reject(error);
  }
);

//respone拦截器
service.interceptors.response.use(
  response => {
    // 在status正确的情况下，code不正确则返回对应的错误信息（后台自定义为200是正确，并且将错误信息写在message），正确则返回响应
    return response.data.code == 200 ? response : Promise.reject(response.data.message);
  },
  error => { 
    // 在status不正确的情况下，判别status状态码给出对应响应
    if (error.response) {
      console.log("在respone拦截器显示错误：", error.response)
      switch (error.response.status) {
        case 401:
          //可能是token过期，清除它
          // this.$store.commit("del_token"); 
          store.commit("del_token");

          router.replace({ //跳转到登录页面
            path: '/login',
             // 将跳转的路由path作为参数，登录成功后跳转到该路由
            query: { redirect: router.currentRoute.fullPath }
          });
      }
    }
    return Promise.reject(error.response.data);
  }
);


export default service

/* eslint-disable */
import Vue from 'vue'
import Router from 'vue-router'
import Main from '@/main/index'

import store from '@/store'
import storage from '@/model/storage'

Vue.use(Router)

const routes = [
 {
  path: '/',
  name: 'Main',
  redirect: '/login',
  // 某些页面规定必须登录后才能查看 ，可以在router中配置meta，将需要登录的requireAuth设为true，
  meta: {
   requireAuth: true,
  }
 },

 {
  path: '/login',
  component: () => import('@/views/login'),
 },

 {
  path: '/invoice',
  redirect: '/invoice',
  component: Main,
 },

  ]
 },
 {
  path: '*',
  component: Main
 }
]

const router = new Router({ routes: routes })

// 设置路由守卫，在进页面之前，判断有token，才进入页面，否则返回登录页面
if (storage.get("token")) {
 store.commit("set_token", storage.get("token"));
}
router.beforeEach((to, from, next) => {
 // 判断要去的路由有没有requiresAuth
 // to.matched.some(r => r.meta.requireAuth) or to.meta.requiresAuth
 if (to.matched.some(r => r.meta.requireAuth)) {
  if (store.state.token) {
   next(); //有token,进行request请求，后台还会验证token
  } else {
   next({
    path: "/login",
    // 将刚刚要去的路由path（却无权限）作为参数，方便登录成功后直接跳转到该路由，这要进一步在登陆页面判断
    query: { redirect: to.fullPath } 
   });
  }
 } else {
  next(); //如果无需token,那么随它去吧
 }
});

export default router

import Vue from 'vue'
// import Vuex from 'vuex'
import App from './App'
import router from './router'

import ElementUI from 'element-ui';
import 'element-ui/lib/theme-chalk/index.css'
// import VueResource from 'vue-resource'
// import axios from 'axios'

// 兼容ie
// import 'babel-polyfill';

Vue.use(ElementUI);
// Vue.use(Vuex);
// Vue.use(VueResource);
// Vue.use(axios);

Vue.config.productionTip = false
Vue.component(CollapseTransition.name, CollapseTransition)
// this.$ajax 全局使用axios
// Vue.prototype.$ajax=axios;

new Vue({
 el: '#app',
 router:router,
 components: { App },
 template: '<App/>'
})

import { postLogin } from "@/api/login";

submitForm(formName) {
   this.$refs[formName].validate(valid => {
    if (valid) {
     let that = this;
     // console.log('username',this.loginForm.username)
     // 通过校验规则后进入校验用户名密码是否正确
     postLogin(this.loginForm.username, this.loginForm.password)
      .then(res => {
       console.log(res);
       
        that.$store.commit("set_token", res.data.token);
        that.$store.commit("setUserInfo", res.data.account);

       this.$notify({
        title: "登录成功",
        type: "success",
        showClose: false,
        duration: 1000
       });
       setTimeout(() => {
        // 此时要判断/login后面的参数，若无参数，进入主页；
        this.$router.push("/index");
        // 若有参数则参数为未有权限的那个路由，跳转到那个路由
        // this.$router.push(***); -- 具体要自己在这实现
       }, 1000);
      })
      .catch(error => {
      // 错误分为 status-请求错误 和 code-账号密码错误
       this.$message.error(error);
       console.log(error);
      });
    } else {
    // 不符合前端校验
     this.$message.error('format error：'+error);
     console.log('format error：',error);
     return false;
    }
   });
  }

import request from '@/utils/request.js'

export function postLogin(account,password) {
  console.log(account,password)
  return request({
    url: '/login',
    method: 'post',
    params:{
    // 具体传参（键）要看后台要求
      account:account,
      password:password
    }
  })
}