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){
      console.log('message: '+msg)
      // socket.broadcast.emit('hi');
      io.emit('chat message',msg)
    })
    socket.on('disconnect', function(){
      console.log('user disconnected');
    });
  })
  
  http.listen(3000, function(){
    console.log('listening on *:3000');
  });