timer/public/js/main.js

var socket = io.connect(window.location.hostname);

socket.on('time', function (data) {
    $('#countdown').html(data.time);
});

$('#start').click(function() {
    socket.emit('click:start');
});

$('#stop').click(function() {
    socket.emit('click:stop');
});

$('#reset').click(function() {
    socket.emit('click:reset');
});