//跨浏览器兼容问题
			Util = {

					//添加类名
					add : function(ele,type,hand){

						if(ele.addEventListener){
								ele.addEventListener(type,hand,false);

						}else if(ele.attachEvent){
								ele.attachEvent("on" + type,hand);

						}else{

							ele["on" + type] = hand;
						}



					},

					//删除类名

					remove : function(ele,type,hand){

								if(ele.removeEventListener){
										ele.removeEventListener(type,hand,false);

								}else if(ele.detachEvent){
										ele.detachEvent("on" + type,hand);

								}else{

									ele["on" + type] = null;;
								}



					},

					//兼容事件对象
					getEvent : function(event){
						return event ? event : window.event;
					},

					//兼容获取当前标签

					getTarget : function(event){
						return event.target || event.srcElement;
					}
			},

  

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