js封装自定义事件

function bindEvent(obj,events,fn){
	obj.listeners=obj.listeners||{};
	obj.listeners[events]=obj.listeners[events]||[];
	obj.listeners[events].push(fn);
	if(obj.nodeType){
		if(obj.addEventListener){
			obj.addEventListener(events,fn,false);
		}else{
			obj.attachEvent('on'+events,fn);
		}
	}
}
function fireEvent(obj,events){
	for(var i=0;i<obj.listeners[events].length;i++){
		obj.listeners[events][i]();
	}
}