wsserver.js

var http            = require('http');
var WebSocketServer = require('ws').Server;
var wss             = new WebSocketServer({ port : 9001 });

http.createServer(function(req, res) {
  res.end([
    '<script>',
    'var ws = new WebSocket("ws://localhost:9001");',
    'ws.onmessage = function(ev) {',
    '  console.log("received message: " + ev.data);',
    '};',
    'setInterval(function() {',
    '  ws.send(Math.random());',
    '}, 1000);',
    '</script>'
  ].join('\n'));
}).listen(9000, function() {
  console.log('Open http://localhost:9000/ in your browser');
});

wss.broadcast = function(data) {
  for (var i in this.clients)
    this.clients[i].send(data);
};

wss.on('connection', function(ws) {
  ws.on('message', function(message) {
    wss.broadcast('Broadcast message: ' + message);
  });
});