//处理浏览器之间的差异
var EventUtil = {
addHandler: function (element, type, handler) {
if (element.addEventListener) {
element.addEventListener(type, handler, false); //Dom2级方法
}
else if (element.attachEvent) {
element.attachEvent("on" + type, handler); //IE方法
}
else {
element["on" + type] = handler; //Dom0级方法
}
},
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;
}
},
getEvent: function (event) {//返回对event对象的引用
return event ? event : window.event;
},
getTarget: function (event) {//返回事件的目标
return event.target || event.srcElement;
},
preventDefault: function (event) {//取消事件的默认行为
if (event.preventDefault) {
event.preventDefault();
}
else {
event.returnValue = false;
}
},
stopPropagation: function (event) {//阻止事件冒泡
if (event.stopPropagation) {
event.stopPropagation();
}
else {
event.cancelBubble = true;
}
},
getRelatedTarget: function (event) {
if (event.relatedTarget) {//DOM只对于mouseout、mouseover才包含值
return event.relatedTarget;
}
else if (event.toElement) {//IE mouseout
return event.toElement;
}
else if (event.fromElement) {//IE mouseover
return event.fromElement;
}
else {
return null;
}
},
getButton: function (event) {
if (document.implementation.hasFeature("MouseEvents", "2.0")) {
return event.button;
}
else {
switch (event.button) {
case 0: //表示没按下按钮
case 1: //表示按下了主鼠标按钮
case 3: //表示同时按下了主,次鼠标按钮
case 5: //表示同时按下了主鼠标按钮和中间的鼠标按钮
case 7: //表示同时按下了三个鼠标按钮
return 0;
case 2: //表示按下了次鼠标按钮
case 6: //表示同时按下了次鼠标按钮和中间的鼠标按钮
return 2;
case 4: //表示按下了中间的鼠标按钮
return 1;
}
}
},
getWheelDelta: function (event) {//检测事件是否包含wheelDelta属性
if (event.wheelDelta) {
return (client.engine.opera && client.engine.opera < 9.5 ? -event.wheelDelta : event.wheelDelta);
}
else {
return -event.detail * 40;
}
},
getCharCode: function (event) {//检测charCode属性是否包含数值
if (typeof event.charCode == "number") {
return event.charCode;
}
else {
return event.keyCode;
}
}}闲着无聊,看书看到这些,总结了下
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