var EventUtil = {
            addHandler: function(element,type,handler){//添加事件
                if (element.addEventListener)
                {
                    element.addEventListener(type,handler,false);
                }else if (element.attachEvent)
                {
                    element.attachEvent(
 
‘on‘+type,handler);
                }else {
                    element[‘on‘+type] = handler;
                }
            },
            getEvent: function(event){//獲得事件對象
                return event || window.event;
            },
            getTarget: function(event){//獲得事件元素
                return
 
 event.target || event.srcElement;
            },
            preventDefault: function(){//取消默認事件行為
                if (event.preventDefault)
                {
                    event.preventDefault();
                }else {
                    event.returnValue = false;
                }
            },
            removeHandler: 
 
function(element,type,handler){//取消事件
                if (element.removeEventListener)
                {
                    element.removeEventListener(type,handler,false)
                }else if (element.dettchEvent)
                {
                    element.dettchEvent(‘on‘+type,handler);
                }else {
                    element[‘on‘+type] = null;
                }
            },
            stopPropagation: function(event){//取消冒泡機制if (event.stopPropagation)
                {
                    event.stopPropagation();
                }else {
                    event.cancleBubble = true;
                }
            }
        }

首先要用EventUtil.getEvent(event);獲得統一的event對象

跨瀏覽器的事件對象