1.总结事件兼容
var EventUtil = {
addHandler: function (element, type, handler) {//添加监听事件兼容
if (element.addEventListener) {
element.addEventListener(type, handler, false);
} else if (element.attachEvent) {//兼容ie
element.attachEvent("on" + type, handler);
} else {
element["on" + type] = handler;
}
},
getEvent: function (event) {//event兼容
return event ? event : window.event;
},
getTarget: function (event) {//获取当前目标元素
return event.target || event.srcElement;
},
preventDefault: function (event) {//阻止默认事件兼容
if (event.preventDefault) {
event.preventDefault();
} else {//兼容ie
event.returnValue = false;
}
},
removeHandler: function (element, type, handler) {//移除监听事件兼容
if (element.removeEventListener) {
element.removeEventListener(type, handler, false);
} else if (element.detachEvent) {//兼容ie
element.detachEvent("on" + type, handler);
} else {
element["on" + type] = null;
}
},
stopPropagation: function (event) {//阻止事件冒泡兼容
if (event.stopPropagation) {
event.stopPropagation();
} else {//兼容ie
event.cancelBubble = true;
}
},
getRelatedTarget: function (event) {//mouseout和mouseover事件时,获取相关元素
if (event.relatedTarget) {
return event.relatedTarget;
} else if (event.toElement) {
return event.toElement;
} else if (event.fromElement) {
return event.fromElement;
} else {
return null;
}
},
getButton: function (event) {//mousedown和mouseup事件,返回值 0表示鼠标左键,1表示中间的鼠标按钮(鼠标滚轮按钮),2表示次鼠标右键
if (document.implementation.hasFeature("MouseEvents", "2.0")) {
return event.button;
} else {
switch (event.button) {
case 0:
case 1:
case 3:
case 5:
case 7:
return 0;
case 2:
case 6:
return 2;
case 4:
return 1;
}
}
},
getWheelDelta: function(event) {//兼容鼠标滚轮事件
if (event.wheelDelta) {
//在 Opera 9.5 之前的版本中,wheelDelta 值的正负号是颠倒的。如果你打算支持早期的 Opera 版本,就需要使用浏览器检测技术来确定实际的值
return (client.engine.opera && client.engine.opera < 9.5 ?
-event.wheelDelta : event.wheelDelta);
} else {
return -event.detail * 40;
}
},
getCharCode: function(event){ //兼容获取当前键盘事件的ASCII编码
if (typeof event.charCode == "number"){
return event.charCode;
} else {
return event.keyCode;
}
},
getClipboardText: function(event){//兼容获取剪贴板内容
var clipboardData = (event.clipboardData || window.clipboardData);
return clipboardData.getData("text");
},
setClipboardText: function(event, value){//兼容设置剪贴板内容
if (event.clipboardData){
return event.clipboardData.setData("text/plain", value);
} else if (window.clipboardData){//兼容ie
return window.clipboardData.setData("text", value);
}
},
};