写了个简单的DEMO,不懂操作的同学可以看看，安装 vue 就不多说了，官方文档很详细

#安装服务器端
npm install --save socket.io
npm install --save express
npm install --save request
npm install --save redis

#安装客户端
npm install --save socket.io-client
#安装VUE库
npm install --save vue-socket.io

在vue的 main.js 里写上

//与服务端链接
import VueSocketio from 'vue-socket.io';
import socketio from 'socket.io-client'
Vue.use(VueSocketio, socketio('ws://127.0.0.1:3000',{
    query: 'token=1234567'
  }));

编辑 App.vue，编写事件方法

<script>
export default {
  name: 'app',
  sockets:{
        //跳转登陆界面
        auth_to_login:function(){
            this.$router.push({ name: 'login'});
        },
        //跳转到首页
        auth_to_index:function(){
            this.$router.push({ name: 'Index'});
        }
  }
}  
</script>

服务端端代码

let socketIo = require('socket.io');
let express = require('express');
let request = require('request');
let redis = require('redis');

let redisClient = redis.createClient;

let httpPort = 3000;
let channelId = 1
let app = express();

app.get('/',function(req,res){
    res.send('启动成功：' + httpPort);
});

//连接redis
let cache = redisClient({ port: 6379, host: '127.0.0.1' });
 
let server = require('http').createServer(app);
let io = socketIo(server);

io.on('connection',function(socket){ 
    console.log('有客户端连接' + socket.id);
    //取得token
    let token = socket.handshake.query.token;
    //根据token看是否有效登陆状态
    if (!token){
        console.log('没有授权');
        socket.emit('auth_to_login');
        return false;
    }else{
        #通过取得redis cache判断
        cache.get(token, function (err, response) {
            if (!response){
                console.log('账号过期');
                #通知客户端
                socket.emit('auth_to_login');
                //当然也可以使用 disconnect 断开链接，如果是单页应用，断开后记得要重新建立连接
                //socket.on('disconnect', function() {});

            }else{
                 #通过API判断
                 let result = request({
                    url: 'http://xx.com/user/check',
                    method: "POST",
                    json: true,
                    headers: {
                        "content-type": "application/json",
                        "charset":"UTF-8",
                    },
                    body: {token:token}
                }, function(error, response, body) {
                    if (!error && response.statusCode == 200) {
                        body = JSON.stringify(body) 
                        result =JSON.parse(body) 
                        if (result.code == 0){
                            #通知客户端
                            socket.emit('auth_to_index');
                        }
                    }
                });
            }
        });
        return false;
    }
});
server.listen(httpPort); //用server连接

启动socket服务器

执行 node app.js