var socket;
$(document).ready(function(){
    socket = io.connect('http://' + document.domain + ':' + location.port + '/test');
    socket.on('my response', function(msg) {
        console.log('<p>Received: ' + msg.data + '</p>');
    });
});

function sendMsg(){
    socket.emit('my broadcast event', {data: "test_data"});
}