DOM Level 2 Events: handleEvent

gistfile1.js

/*
* DOM Level 2 Events: handleEvent
* @author Alexander Guinnes, Thomas Aylott (original author)
* @description http://ajaxian.com/archives/an-alternative-way-to-addeventlistener
**/

function EventListener(element, phase)
{
	var listener = {
		addEvent: function (type, callback)
		{
			var stack = (this["@" + type] || (this["@" + type] = []));

			if (!~stack.indexOf(callback))
				stack.push(callback);

			return this;
		},

		handleEvent: function (event)
		{
			var stack = this["@" + event.type];

			if (stack)
			{
				stack.forEach(function (callback, index, stack)
				{
					if (callback.call(this, event, callback, this) === false) {
						this["@" + event.type] = stack.slice();
						stack.length = 0;
					}
				}, this);
			}
		},

		removeEvent: function (type, callback)
		{
			var stack = this["@" + type], i;

			if (stack && ~(i = stack.indexOf(callback)))
				stack.splice(i, 1);

			return this;
		}
	};

	element.addEventListener('click', listener, phase || false);

	return listener;
}

var listen = new EventListener(document);

listen.addEvent("click", function (event) {
	alert(event.target);
});

Looks so frustrating. Can you provide an example?