跨浏览器的兼容性问题的解决方案

var eventUil = {
//添加句柄
addHandler : function(element,type,handler){
if(element.addEventListener){
element.addEventListener(type,handler,false);
}else if(element.attachEvent){
element.attachEvent('on'+type,handler);
}else{
element['on'+type] = handler;
// element.onclick===element[onclick];
}
}
//删除句柄
removeHandler : function(element,type,handler){
if(element.removeEventListener){
element.removeEventListener(type,handler,false);
}else if(element.detachEvent){
element.detachEvent('on'+type,handler);
}else{
element['on'+type] = null;
}
}
}