<!-- Load socket.io client-side -->
<script src="/socket.io/socket.io.js"></script>
<script src="https://code.jquery.com/jquery-1.11.1.js"></script>
<script>

    $(function (){

        var socket = io();

        $('form').submit(function(){
            socket.emit('chat message', $('#m').val());
            $('#m').val('');
            return false;
        });

        socket.on('chat message', function(msg){
            $('#messages').append($('<li>').text(msg));
        });

    });