var addEvent = (function() {    if (document.addEventListener) {        return function(el, type, fn) {            if (el.length) {                for (var i = 0; i < el.length; i++) {                    addEvent(el[i], type, fn); } } else { el.addEventListener(type, fn, false); } }; } else { return function(el, type, fn) { if (el.length) { for (var i = 0; i < el.length; i++) { addEvent(el[i], type, fn); } } else { el.attachEvent('on' + type, function() { return fn.call(el, window.event); }); } }; } })();