Nodejs express 4 sockete.io共有sessio

io.use(function(socket, next) {
	var data = socket.handshake || socket.request;
	if (data.headers.cookie) {
		data.cookie = cookie.parse(data.headers.cookie);
		data.sessionID = cookieParser.signedCookie(data.cookie[COOKIE_KEY], COOKIE_SECRET);
		data.sessionStore = sessionStore;
		sessionStore.get(data.sessionID, function (err, session) {
			if (err || !session) {
				return next(new Error('session not found'))
			} else {
				data.session = session;
				data.session.id = data.sessionID;
				next();
			}
		});
	} else {
		return next(new Error('Missing cookie headers'));
	}
});