代码如下，后面还会修改

import Vue from 'vue'
import Vuex from 'vuex'
import VueRouter from 'vue-router'
import App from '../component/App.vue'
import Login from '../component/Login.vue'
import UserInfo from '../component/UserInfo.vue'
//状态管理
Vue.use(Vuex)
  //路由
Vue.use(VueRouter)

//路由配置
//如果需要加菜单，就在这里添加路由，并在UserMenu.vue添加入口router-link
const router = new VueRouter({
  routes: [{
    path: '/login',
    component: Login
  }, {
    path: '/user_info',
    component: UserInfo
  }]
})

//Vuex配置
const store = new Vuex.Store({
  state: {
    domain:'http://test.example.com', //保存后台请求的地址，修改时方便（比方说从测试服改成正式服域名）
    userInfo: { //保存用户信息
      nick: null,
      ulevel: null,
      uid: null,
      portrait: null
    }
  },
  mutations: {
    //更新用户信息
    updateUserInfo(state, newUserInfo) {
      state.userInfo = newUserInfo;
    }
  }
})

//设置cookie,增加到vue实例方便全局调用
Vue.prototype.setCookie = (c_name, value, expiredays) => {
  var exdate = new Date();　　　　
  exdate.setDate(exdate.getDate() + expiredays);　　　　
  document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
}

//获取cookie
Vue.prototype.getCookie = (name) => {
    var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
    if (arr = document.cookie.match(reg))
        return (arr[2]);
    else
        return null;
}

//删除cookie
Vue.prototype.delCookie =(name) => {
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = this.getCookie(name);
    if (cval != null)
      document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
  }

//vue实例
var app = new Vue({
  data: {},
  el: '#app',
  render: h => h(App),
  router,
  store,
  watch:{
    "$route" : 'checkLogin'
  },
  created() {
    this.checkLogin();
  },
  methods:{
    checkLogin(){

      //检查是否存在session
      if(!this.getCookie('session')){
        this.$router.push('/login');
      }else{
        this.$router.push('/user_info');
      }
    }
  }
})