Here you can find the source of addClickEvent(func)
HTMLElement.prototype.addClickEvent = function addClickEvent(func) { this.addEvent("click", func, false); };
HTMLElement.prototype.addEvent = function (event, callback, bubble) { this.addEventListener( event, function (event) { try { callback.apply(this, arguments); } catch (e) { console.log(e); event.preventDefault(); return false; }, bubble); };
Element.prototype.delegate = function(eventName, elementSelector, cb) { var _this = this _this.addEventListener(eventName, function(evt) { var _this = evt.target if (_this.is(elementSelector)) { cb.call(_this, evt) if (_this.parentNode.is(elementSelector)) { cb.call(_this.parentNode, evt) ...