javascript——事件处理

<script type="text/javascript">

function EventUtil() {
var _self = this;
///添加事件
var addEvent = (function () {
if (document.addEventListener) {
return function (el, type, fn) {
el.addEventListener(type, fn, false);
}
} else {
return function (el, type, fn) {
el.attachEvent("on" + type, function () {
return fn.call(el, window.event);
});
}
}
})();

///添加属性改变事件
var addPropertyChangeEvent = function (obj, fn) {
if (window.ActiveXObject) {
obj.onpropertychange = fn;
} else {
obj.addEventListener("input", fn, false);
}
}

//移除事件
var removeEvent = function (obj, type, fn) {
if (obj.removeEventListener) {
obj.removeEventListener(type, fn, false);
} else if (obj.detachEvent) {
obj.detachEvent("on" + type, obj["on" + type + fn]);
obj["on" + type + fn] = null;
}
}

//加载事件
var loadEvent = function (fn) {
var oldonload = window.onload;
if (typeof oldonload != "function") {
window.onload = fn;
} else {
window.onload = function () {
oldonload();
fn();
}
}
}

//阻止事件
var stopEvent = function (e) {
e = e || window.event;
if (e.preventDefault) {
e.preventDefault();
e.stopPropagation();
} else {
e.returnValue = false;
e.cancelBubble = true;
}
}

//如果仅仅是阻止事件冒泡
var stopPropagation = function (e) {
e = e || window.event;
if (!+"\v1") {
e.cancelBubble = true;
} else {
e.stopPropagation();
}
}

//取得事件源对象
var getEvent1 = function (e) {
e = e || window.event;
var obj = e.srcElement ? e.srcElement : e.target;
return obj;
}
//取得事件源对象
var getEvent2 = function (e) {
if (window.event) return window.event;
var c = getEvent2.caller;
while (c.caller) {
c = c.caller;
}
return c.arguments[0];
}

//或者这个功能更强大
var getEvent3 = function (e) {
var e = e || window.event;
if (!e) {
var c = this.getEvent3.caller;
while (c) {
e = c.arguments[0];
if (e && (Event == e.constructor || MouseEvent == e.constructor)) {
break;
}
c = c.caller;
}
}
var target = e.srcElement ? e.srcElement : e.target,
currentN = target.nodeName.toLowerCase(),
parentN = target.parentNode.nodeName.toLowerCase(),
grandN = target.parentNode.parentNode.nodeName.toLowerCase();
return [e, target, currentN, parentN, grandN];
}

_self.addEvent = addEvent;
_self.addPropertyChangeEvent = addPropertyChangeEvent;
_self.removeEvent = removeEvent;
_self.loadEvent = loadEvent;
_self.stopEvent = stopEvent;
_self.stopPropagation = stopPropagation;
_self.getEvent1 = getEvent1;
_self.getEvent2 = getEvent2;
_self.getEvent3 = getEvent3;
}
var eventUtil = new EventUtil();
eventUtil.loadEvent(function () {
eventUtil.addEvent(document, "click", function (e) {
alert(eventUtil.getEvent3(e));
});

eventUtil.addPropertyChangeEvent(document,function(e){
alert(eventUtil.getEvent3(e));
});
});

</script>