var EventUtil = { ????addHandler:function(elem,type,handler){ ?????????if(elem.addEventListener){ ????????????elem.addEventListener(type,handler,false); ????????????????} ?else if(elem.attachEvent){ ???????????elem.attachEvent(‘on‘+type,handler) ???????}else{ ???????????elem[‘on‘+type]=null; ???????} ???} ??????} ???????js-addEventListener
原文地址：http://www.cnblogs.com/huangmin1992/p/7518029.html