microObservables.js

var observable = function (o) {
	var h = {};

	o.on = function (e, fn) {
		if(typeof fn !== "function") return;
		if(!h[e]) h[e] = []; 
		h[e].push(fn);
		return o;
	};

	o.off = function (es) {
		es = es.split(/\s+/);
		for (var i = 0; i < es.length; i++) {
			delete h[es[i]];
		}
		return o;
	};

	o.trigger = function (e) { 
		var args = Array.prototype.slice.call(arguments, 1);
			fns = h[e] || [];
		for (var i = 0; i < fns.length; i++) {
			fns[i].apply(fns[i], args);
		}
		return o;
	};

	return o;
};

if (typeof exports === 'undefined') {
  window.observable = observable;
  if (typeof window.define === "function" && window.define.amd) {
    window.define("microObservables", [], function() {
      return window.observable;
    });
  }
} else {
  module.exports = observable;
}