使用socket.io

Question

很想做一个简单的聊天系统，为此我必须展示 所有的客户都是连接的。我尝试使用sivrel技术而且它不起作用。 我试图在客户端连接时发出一个套接字并且它不起作用。 这就是我的尝试：

app.post('/login', (req, res)=>{
	let user = req.body.username
	let pass = req.body.password
	console.log("le user est = " + user + " \nle password est = " + pass);
	connection.query('SELECT * FROM user WHERE username = ? AND password = ?', [user,pass], function (error, results, fields) {
		if (error) throw error;
		console.log(results.length);
		console.log(results[0]);	  			
		if (results.length==1){
			const user_id =  results[0]
			io.sockets.emit('new_user',{user:results[1]})
			req.login(user_id,(err)=>{
				res.redirect('/home');
			})
		}else {
			res.redirect('/');
		}
	});
});

那个完整的代码： server.js：

let express = require('express');
let app = express();

let bodyParser = require('body-parser')
let server = require('http').createServer(app);
var io = require('socket.io')(server);
let session = require('express-session')
let MySQLStore = require('express-mysql-session')(session);
let passport = require('passport');
let mysql = require('mysql');
let hbs = require('hbs')
var options = {
	host: 'localhost',
	user: 'root',
	password: '',
	database: 'robot'
};
var sessionStore = new MySQLStore(options);
let connection = mysql.createConnection(options); 
connection.connect(function(err) {
	if (err) {
		console.error('MYSQL error connecting : ' + err.stack);
		return;
	} 
	console.log('connected as id ' + connection.threadId);
});
app.use(session({
	secret: 'ldifgquoqjfejg',
	store: sessionStore,
  	//comme elle change que lorsque on modéfie la session
  	resave: false,
  	saveUninitialized: false,
  //cookie: { secure: true }
}))
app.use(passport.initialize());
app.use(passport.session());

//hbs configure
app.set('view engine', 'html');
app.engine('html', hbs.__express);
hbs.registerPartials(__dirname + '/views/partials');
hbs.localsAsTemplateData(app);

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

app.get('/', (req, res)=>{
	res.render('login');
});
app.get('/home', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('index');
});
app.get('/robot', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('robot');
});
app.get('/userlist', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('listeuser');	
});
app.get('/history', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('history');	
});
app.get('/chat', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('chat');	
});
app.get('/cam', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('cam');	
});
app.get('/bras', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('bras');	
});
app.get('/base', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('base');	
});
app.get('/ajout', authenticationMiddleware(), (req, res)=>{
	app.locals.user = req.user.username
	res.render('ajout');	
});
app.get('/Logout', (req, res)=>{
	req.logout();
	req.session.destroy();
	res.redirect('/');
});

app.post('/login', (req, res)=>{
	let user = req.body.username
	let pass = req.body.password
	console.log("le user est = " + user + " \nle password est = " + pass);
	connection.query('SELECT * FROM user WHERE username = ? AND password = ?', [user,pass], function (error, results, fields) {
		if (error) throw error;
		console.log(results.length);
		console.log(results[0]);	  			
		if (results.length==1){
			const user_id =  results[0]
			io.sockets.emit('new_user',{user:results[1]})
			req.login(user_id,(err)=>{
				res.redirect('/home');
			})
		}else {
			res.redirect('/');
		}
	});
});

passport.serializeUser(function(user_id, done) {
	done(null, user_id);
});
passport.deserializeUser(function(user_id, done) {
	done(null, user_id);
});
//socket
	io.on('connection', (socket)=>{
		socket.emit('user','data')
	});
	
//socket
server.listen(8000);
app.use(express.static('./views'));
function authenticationMiddleware(){
	return(req, res, next)=>{
		//console.log('req.session.passport.user: ${JSON.stringify(req.session.passport)}')
		if (req.isAuthenticated()) return next();
		res.redirect('/')
	}
}

和chat.html

<script src="/socket.io/socket.io.js"></script>
                <script type="text/javascript">
                    socket = io.connect('http://localhost:8000')
                    socket.on('new_user',(data)=>{
                        document.getElementById('ilyes').innerHTML=data.user
                    })
                </script>