自己整理的一套javascript小型公用库

/**
 * @author zjq common use jslib
 */
//事件侦听函数
function addLoadListener(fn){
    if (typeof window.addEventListener != 'undefined') {
        window.addEventListener('load', fn, false);
    }
    else 
        if (typeof document.addEventListener != 'undefined') {
            document.addEventListener('load', fn, false);
        }
        else 
            if (typeof window.attachEvent != 'undefined') {
                window.attachEvent('onload', fn);
            }
            else {
                var oldfn = window.onload;
                if (typeof window.onload != 'function') {
                    window.onload = fn;
                }
                else {
                    window.onload = function(){
                        oldfn();
                        fn();
                    };
                }
            }
}

//添加事件

function attachEventListener(target, eventType, functionRef, capture){
    if (typeof target.addEventListener != "undefined") {
        target.addEventListener(eventType, functionRef, capture);
    }
    else 
        if (typeof target.attachEvent != "undefined") {
            target.attachEvent("on" + eventType, functionRef);
        }
        else {
            eventType = "on" + eventType;
            
            if (typeof target[eventType] == "function") {
                var oldListener = target[eventType];
                
                target[eventType] = function(){
                    oldListener();
                    
                    return functionRef();
                }
            }
            else {
                target[eventType] = functionRef;
            }
        }
    
    return true;
}

//去除事件公用函数
function detachEventListener(target, eventType, functionRef, capture){
    if (typeof target.removeEventListener != "undefined") {
        target.removeEventListener(eventType, functionRef, capture)
    }
    else 
        if (typeof target.detachEvent != "undefined") {
            target.detachEvent("on" + eventType, functionRef);
        }
        else {
            target["on" + eventType] = null;
        }
    
    return true;
};


//for 检测滚动条位置
function getScrollPosition(){
    var position = [0, 0];
    if (typeof window.pageXOffset != "undefined") {
        position = [window.pageXOffset, window.pageYOffset];
        //for ko,safri,firefox早期浏览器,opera;
    }
    else {
        if (typeof document.documentElement.scrollTop != "undefined" && document.documentElement.scrollTop > 0) {
            //for ie,后期firefox支持;
            position = [document.documentElement.scrollLeft, document.documentElement.scrollTop];
            
        }
        else 
            if (typeof document.body.scrollLeft != "undefined") {
                position = [document.body.scrollLeft, document.body.scrollTop];
            }
    }
    return position;
    
}

//for 检测光标位置

function getCursorPosition(event){
    //for ie event
    if (typeof event == "undefined") {
        event = window.event;
    }
    var scrollPostion = getScrollPosition();
    //  alert(scrollPostion[0]);
    // alert(scrollPostion[1]);
    
    var aCursorPosition = [0, 0];
    if (typeof pageX != "undefined" && typeof event.x != "undefined") //event.x for Mac下的ie有pageX属性，但是它
    //返回的值与事实不符，所以要核实一下属性x.
    {
        aCursorPosition[0] = event.pageX;
        aCursorPosition[1] = event.pageY;
    }
    else {
        aCursorPosition[0] = event.clientX + scrollPostion[0];
        aCursorPosition[1] = event.clientY + scrollPostion[1];
    }
    
    //var oResult = document.getElementById("result");
    
    // oResult.innerHTML = "X坐标为:" + aCursorPosition[0] + '\r' + "Y坐标为:" + aCursorPosition[1];
    return true;
}

//for 查看一个元素的属性

function retrieveComputedStyle(element, styleProperty){
    var computedStyle = null;
    
    if (typeof element.currentStyle != "undefined") {
        computedStyle = element.currentStyle;
    }
    else {
        computedStyle = document.defaultView.getComputedStyle(element, null);
    }
    
    return computedStyle[styleProperty];
}


function getElePosition(theEle){
    var xTheEle = 0;
    var yTheEle = 0;
    while (theEle != null) {
        xTheEle += theEle.offsetLeft;
        yTheEle += theEle.offsetTop;
        theEle = theEle.offsetParent;
        
    }
    return [xTheEle, yTheEle];
}

//for 检测浏览器
function identifyBrowser(){
    var agent = navigator.userAgent.toLowerCase();
    
    if (typeof navigator.vendor != "undefined" && navigator.vendor == "KDE" && typeof window.sidebar != "undefined") {
        return "kde";
    }
    else 
        if (typeof window.opera != "undefined") {
            var version = parseFloat(agent.replace(/.*opera[\/ ]([^ $]+).*/, "$1"));
            
            if (version >= 7) {
                return "opera7";
            }
            else 
                if (version >= 5) {
                    return "opera5";
                }
            
            return false;
        }
        else 
            if (typeof document.all != "undefined") {
                if (typeof document.getElementById != "undefined") {
                    var browser = agent.replace(/.*ms(ie[\/ ][^ $]+).*/, "$1").replace(/ /, "");
                    
                    if (typeof document.uniqueID != "undefined") {
                        if (browser.indexOf("5.5") != -1) {
                            return browser.replace(/(.*5\.5).*/, "$1");
                        }
                        else {
                            return browser.replace(/(.*)\..*/, "$1");
                        }
                    }
                    else {
                        return "ie5mac";
                    }
                }
                
                return false;
            }
            else 
                if (typeof document.getElementById != "undefined") {
                    if (navigator.vendor.indexOf("Apple Computer, Inc.") != -1) {
                        if (typeof window.XMLHttpRequest != "undefined") {
                            return "safari1.2";
                        }
                        
                        return "safari1";
                    }
                    else 
                        if (agent.indexOf("gecko") != -1) {
                            return "mozilla";
                        }
                }
    
    return false;
};

//for 检测操作系统


function identifyOS(){
    var agent = navigator.userAgent.toLowerCase();
    
    if (agent.indexOf("win") != -1) {
        return "win";
    }
    else 
        if (agent.indexOf("mac")) {
            return "mac";
        }
        else {
            return "unix";
        }
    
    return false;
};

//for 检测event事件所指定的对象
function getEventTarget(event){
    var targetElement = null;
    
    if (typeof event.target != "undefined") {
        targetElement = event.target;
    }
    else {
        targetElement = event.srcElement;
    }
    
    while (targetElement.nodeType == 3 && targetElement.parentNode != null) {
        targetElement = targetElement.parentNode;
    }
    
    return targetElement;
};


function addEventHandler(oTarget, sEventType, fnHandler){
    if (oTarget.addEventListener) {
        oTarget.addEventListener(sEventType, fnHandler, false);
    }
    else 
        if (oTarget.attachEvent) {
            oTarget.attachEvent("on" + sEventType, fnHandler);
        }
        else {
            oTarget["on" + sEventType] = fnHandler;
        }
};

function removeEventHandler(oTarget, sEventType, fnHandler){
    if (oTarget.removeEventListener) {
        oTarget.removeEventListener(sEventType, fnHandler, false);
    }
    else 
        if (oTarget.detachEvent) {
            oTarget.detachEvent("on" + sEventType, fnHandler);
        }
        else {
            oTarget["on" + sEventType] = null;
        }
};



//返回一个对象
var $ = function(id){
    return "string" == typeof id ? document.getElementById(id) : id;
};
//阻止默认动作事件
function stopDefaultAction(event){
    event.returnValue = false;
    
    if (typeof event.preventDefault != "undefined") {
        event.preventDefault();
    }
    
    return true;
};

//根据event返回获到到的一个对象
function getEventTarget(event){
    var targetElement = null;
    
    if (typeof event.target != "undefined") {
        targetElement = event.target;
    }
    else {
        targetElement = event.srcElement;
    }
    
    while (targetElement.nodeType == 3 && targetElement.parentNode != null) {
        targetElement = targetElement.parentNode;
    }
    
    return targetElement;
};
//返回一个对象的位置

function getPosition(theElement){
    var positionX = 0;
    var positionY = 0;
    
    while (theElement != null) {
        positionX += theElement.offsetLeft;
        positionY += theElement.offsetTop;
        theElement = theElement.offsetParent;
    }
    
    return [positionX, positionY];
};

自己整理的公用库。持续更新