PubSub with simple event model in JS

pubsub.js

var o = $({});
$.subscribe = o.on.bind(o);
$.unsubscribe = o.off.bind(o);
$.publish = o.trigger.bind(o);

$(document.body).on( 'click', function() {
  $.publish('data');
});

$.subscribe( 'data', function() {
	console.log('data received');
});