var EventUtil = {//注册事件
    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;}},//移除事件
    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;}},//获取事件getEvent: function(event){return event ? event : window.event;},//获取事件名称getTarget: function(event){return event.target || event.srcElement;},//获取鼠标键getButton: function(event){//DOM2中检测是否有MouseEvents模块if (document.implementation.hasFeature("MouseEvents", "2.0")){return event.button;// var k = event.button;//     switch(k){//         case 0://             return "0:表示左键";//         case 1://             return "1:表示中键";//         case 2://             return "2:表示右键";//     }//IE6,7,8  左键:1,中键:4,右键:2;//Chrome,FF,IE9+   左键:0,中键:1,右键:2;} else {switch(event.button){   //IE下case 0:case 1:             //左键case 3:             //左右键case 5:             //左中键case 7:             //左右中return 0;       //左键case 2:             //右键case 6:             //右中return 2;       //右键case 4: return 1;   //中键
            }}},//获得按键编码值getCharCode: function(event){if (typeof event.charCode == "number"){return event.charCode;} else {return event.keyCode;}},/*event对象的relatedTarget属性提供了相关元素的信息，这个属性只对于mouseover和mouseout事件才包含值；*对于其他事件，这个属性的值是null。*IE不支持relatedTarget属性，但提供了保存着同样信息的不同属性。*在mouseover事件触发时，IE的fromElement属性中保存率相关元素；*在mouseout事件触发时，IE的toElement属性中保存着相关元素。*/getRelatedTarget: function(event){if (event.relatedTarget){return event.relatedTarget;} else if (event.toElement){return event.toElement;} else if (event.fromElement){return event.fromElement;} else {return null;}},//获取鼠标滚轮mousewheel事件getWheelDelta: function(event){if (event.wheelDelta){return (client.engine.opera && client.engine.opera < 9.5 ? -event.wheelDelta : event.wheelDelta);} else {return -event.detail * 40;}},//取消事件的默认行为，如果cancelable是true，则可以使用这个方法；//如:点击超链接时阻止其访问herf属性实现跳转preventDefault: function(event){if (event.preventDefault){event.preventDefault();} else {event.returnValue = false;}},//取消事件的进一步捕获或冒泡。如果bubbles为true则可以使用这个方法；stopPropagation: function(event){if (event.stopPropagation){event.stopPropagation();} else {event.cancelBubble = true;}},//获取剪切板文本getClipboardText: function(event){var clipboardData =  (event.clipboardData || window.clipboardData);return clipboardData.getData("text");},//设置剪切板文本setClipboardText: function(event, value){if (event.clipboardData){event.clipboardData.setData("text/plain", value);} else if (window.clipboardData){window.clipboardData.setData("text", value);}}};