JS解决DOM2级事件解绑兼容问题

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attachEvent和detachEvent：处理IE低版本问题。 

    <script>
		function addEvent(ele,eventType,fn){
			if(ele.addEventListener){//容错判断
				ele.addEventListener(eventType,fn,false);
			}else{
				ele.attachEvent("on"+eventType,fn);
			}
		};

		function removeEvent(ele, eventType, fn){
			if(ele.removeEventListener){
				ele.removeEventListener(eventType, fn);
			}else{
				ele.detachEvent("on"+eventType, fn);
			}
		};
	</script>