Simple socket.io example

## app.js
var http = require('http'),
    fs = require('fs'),
    // NEVER use a Sync function except at start-up!
    index = fs.readFileSync(__dirname + '/index.html');

// Send index.html to all requests
var app = http.createServer(function(req, res) {
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.end(index);
});

// Socket.io server listens to our app
var io = require('socket.io').listen(app);

// Send current time to all connected clients
function sendTime() {
    io.sockets.emit('time', { time: new Date().toJSON() });
}

// Send current time every 10 secs
setInterval(sendTime, 10000);

// Emit welcome message on connection
io.sockets.on('connection', function(socket) {
    socket.emit('welcome', { message: 'Welcome!' });

    socket.on('i am client', function() {
      console.log('received a message from the client.');
    });
});

app.listen(3001);

## index.html
<!doctype html>
<html>
    <head>
        <script src='http://code.jquery.com/jquery-1.7.2.min.js'></script>
        <script src='http://localhost:3001/socket.io/socket.io.js'></script>
        <script>
            var socket = io.connect('http://localhost:3001');

            socket.on('welcome', function(data) {
                $('#messages').append('<li>' + data.message + '</li>');

                socket.emit('i am client', {data: 'foo!'});
            });
            socket.on('time', function(data) {
                console.log(data);
                $('#messages').append('<li>' + data.time + '</li>');
            });
            socket.on('error', function() { console.error(arguments) });
            socket.on('message', function() { console.log(arguments) });
        </script>
    </head>
    <body>
        <ul id='messages'></ul>
    </body>
</html>