text: var app = require('express')();
  var http = require('http').Server(app);
  var io = require('socket.io')(http);
  
  app.get('/', function(req, res){
  res.sendFile(__dirname + '/index.html');
  });
  
  io.on('connection', function(socket){
    console.log('a user connected');
    socket.on('chat message', function(msg){
      io.emit('chat message', msg);
    });
    socket.on('disconnect', function(){
     console.log('user disconnected');
   });
  });
  
  http.listen(3000, function(){
    console.log('Online on port 3000');
  });
  