雅虎、网易ajax标签导航效果的实现

经过多次改进，可以在普通网站上直接使用了，现在发布源程序下载（编码为utf-8，改为gb3212的方法是：用记事本打开，另存时选择相应的编码），希望对大家有用（虽然不一定实用）。
因为只是标签导航,所有内容还会在频道页中体现,所在全部用AJAX读取。
功能的实现思路:

S1 雅虎中国

·单击触发
·<A>块锁定:a{display:block;height:16px;}/*将A锁定为块级,再定义高度和宽度*/
·再次单击弹出链接:在<A>标记的onclick事件中需要执行读取时,return false;否则return true;
·AJAX读取数据
·数据暂存
·窗口平滑收缩
<!--由于我看不懂雅虎的代码,所以使用了一些基本的代码去实现这些功能,可能效率不高,不过效果是出来了.-->

S2 网易
·鼠标滑过延时触发: onmouseover时var waitInterval=window.setTimeout("func();",300);onmouseout时clearTimeout(waitInterval);
·<A>块锁定、AJAX读取数据、数据暂存、窗口平滑收缩

其它功能:
·cookie记忆
·最后读取数据的服务器时间
·滑动门技术

JS文件分析：

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CODE:

function getObject(objectId) {
if(document.getElementById && document.getElementById(objectId)) {
// W3C DOM
return document.getElementById(objectId);
}
else if (document.all && document.all(objectId)) {
// MSIE 4 DOM
return document.all(objectId);
}
else if (document.layers && document.layers[objectId]) {
// NN 4 DOM.. note: this won't find nested layers
return document.layers[objectId];
}
else {
return false;
}
}

var responsecont;
var xmlHttp;
var xH=new Object();
var rqtp=new Object();
var dateStr,dStr;
var requestType;
var etype=0;
var newsstring;
var ajccache=new Object();
var url;
var MouseDelayTime=200;//鼠标感应延迟
var waitInterval;
var Browser = new Object();
Browser.isMozilla = (typeof document.implementation != 'undefined') && (typeof document.implementation.createDocument != 'undefined') && (typeof HTMLDocument!='undefined');
Browser.isIE = window.ActiveXObject ? true : false;
Browser.isFirefox = (navigator.userAgent.toLowerCase().indexOf("firefox")!=-1);
Browser.isOpera = (navigator.userAgent.toLowerCase().indexOf("opera")!=-1);

function SetCookie(name,value,expires){//写cookie
var exp=new Date();
exp.setTime(exp.getTime()+expires*60000);
document.cookie=name+"="+escape(value)+";expires="+exp.toGMTString();//+";domain=arkoo.com;path=/";
}
function readcookie(name){//读取cookie
var oRegex=new RegExp(name+'=([^;]+)','i');
var oMatch=oRegex.exec(document.cookie);
if(oMatch&&oMatch.length>1)return unescape(oMatch[1]);
else return '';
}

function CreateXMLHttpRequest(){
// Initialize Mozilla XMLHttpRequest object
if (window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}
// Initialize for IE/Windows ActiveX version
else if (window.ActiveXObject) {
try{
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP.3.0");
}
catch (e){
try{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){newsstring = "<div class='loading'>Loading rquest content fail, Please try it again latter...</div>";}
}
}
}

function getnews(tagid,x){
url = "tab/"+tagid+'_'+x+'.html';
var url2=url;
requestType = tagid;
if(ajccache[url]==null){
var loadstatustext="<div class='loading'><img src='tab/images/loading.gif' /> Loading request content, please wait...</div>";
rqtp[tagid]=tagid;
CreateXMLHttpRequest();
var hdr=tagid;
xH[tagid]=xmlHttp;
if(etype==1)getObject(requestType+'_cnt').innerHTML = loadstatustext;
xH[tagid].onreadystatechange = function(){
// only if xmlHttp shows "complete"
if (xH[tagid].readyState == 4){
// only http 200 to process
if (window.location.href.indexOf("http")==-1 || xH[tagid].status == 200){
newsstring = xH[tagid].responseText;
dateStr=xH[tagid].getResponseHeader("Date");
dStr = new Date(dateStr);SetCookie('dStr',dStr,10000000);
//inject centent to tab-pane
shownews(rqtp[tagid],newsstring);
ajccache[url2]=newsstring;
}
}
}
xH[tagid].open("GET", url, true);
xH[tagid].setRequestHeader("If-Modified-Since","0");
xH[tagid].send(null);
}
else
{shownews(requestType,ajccache[url]);}
}

function shownews(requestType,newsstring){
//<![CDATA[
responsecont = getObject(requestType+'_cnt');
responsecont.innerHTML = newsstring;
getObject("pdate").innerHTML=dStr;
if(getObject("alta")){ata(getObject("alta"));hideText();}
//]]>
}


function TabNews(tagid,x){
var lim=getObject(tagid+"_mn").getElementsByTagName('li');
var mnt=getObject(tagid+"_mn").getElementsByTagName('li').length;
if(!mnt)mnt=4;
for(var i=0;i<mnt;i++){
if(i == (x-1)){
if(i==0){
lim.className="tabactive1";
}
else{
lim.className="tabactive2";
lim[i-1].getElementsByTagName('a')[0].style.background="url()";
}
lim.getElementsByTagName('a')[0].style.background="url(tab/images/tab_bgs.gif) right -60px no-repeat";
try{getnews(tagid,x);}catch(e){alert(e);}
}
else{
lim.className="";
lim.getElementsByTagName('a')[0].style.background="url(tab/images/tab_bgs.gif) right -88px no-repeat";
}
}
}

var idn,tmpa,tmpat;
var aw="";
var rT;
function aet(tagid,etp){
var lis=getObject(tagid+"_mn").getElementsByTagName('li');
var wts=tagid+"_cnt";
var wnf=tagid+"info";
if(readcookie(tagid+"_cntd")=="none"){
hiddenList(getObject(wts));
maxh[wts]=readcookie(tagid+"_cnth");
getObject("pdate").innerText=readcookie("dStr");
}
else{
if(parseInt(readcookie(wnf))>1)
TabNews(tagid,readcookie(wnf));//返回上次访问
else
TabNews(tagid,1);
if(etp==1)aw=tagid+readcookie(wnf);
}
for(var iy=0;iy<lis.length;iy++){
with(lis[iy]){
if(etp==0){
lis[iy].onmouseover=function(){
rT=attributes.getNamedItem('id').value.substring(0, attributes.getNamedItem('id').value.length-1);
if(getObject(rT+'_cnt').style.display != "none"&&className!="") return;
idn=parseInt(attributes.getNamedItem('id').value.substring(attributes.getNamedItem('id').value.length-1, attributes.getNamedItem('id').value.length));
clearTimeout(waitInterval);
waitInterval=window.setTimeout("etype=0;TabNews(rT,idn);if(getObject(rT+'_cnt').style.display == 'none')displayList(rT+'_cnt'); SetCookie(rT+'info',idn,10000000);SetCookie(rT+'_cntd','ture',10000000);",MouseDelayTime);
}
lis[iy].onmouseout=function(){if(getObject(rT+'_cnt').style.display != "none"&&className!="") return;clearTimeout(waitInterval);}
}
if(etp==1){
lis[iy].onmouseover=function(){getElementsByTagName('a')[0].blur();}
lis[iy].onclick=function(){
idn=parseInt(attributes.getNamedItem('id').value.substring(attributes.getNamedItem('id').value.length-1, attributes.getNamedItem('id').value.length));
rT=attributes.getNamedItem('id').value.substring(0, attributes.getNamedItem('id').value.length-1);
if(getObject(rT+'_cnt').style.display != "none"&&(idn==1&&(this.className=="tabactive1")||aw==attributes.getNamedItem('id').value)) return true;
if(getObject(rT+'_cnt').style.display == "none"){
displayList(rT+'_cnt');SetCookie(rT+'_cntd','ture',10000000);
}
etype=1;
TabNews(rT,idn);
SetCookie(rT+'info',idn,10000000);
aw=attributes.getNamedItem('id').value;
getElementsByTagName('a')[0].blur();
return false;
}}}
}
}

function ata(objid){
var as=objid.getElementsByTagName('a');
for(var i=0;i<as.length;i++){
as.target="_self";
}
}


function GetUrlParam(paramName){ //获取URL参数的函数
var oRegex = new RegExp('[\?&]' + paramName + '=([^&]+)', 'i');
var oMatch = oRegex.exec(window.location.search);
if(oMatch && oMatch.length > 1)
return oMatch[1];
else
return '';
}


function hideText(){
if(document.getElementsByTagName("arkoo:title").length==0){
var upu=GetUrlParam("username");
var upa=GetUrlParam("articleid");
getObject("closeit").innerHTML='<a href="http://cn.arkoo.com/diaryfiles/showpage.aspx?username='+upu+'&articleid='+upa+'" target="_blank">查看原文</a> <a href="tab.html" target="_self">×</a>';
}
}

var maxh=new Object();
//显示内容框
function displayList(oid){
var h = 0;
var objid=getObject(oid);
if(isNaN(parseInt(maxh[oid]))) var max_h = 210; // 容器的最大高度
else
var max_h = maxh[oid];
var anim = function(){
h += 50; // 每次递增50像素
if(h >= max_h){
objid.style.height = max_h + "px";;
getObject('tab'+objid.attributes.getNamedItem('id').value).style.background="url(tab/images/tab_bgs.gif) 5px -113px no-repeat"; // 让图片标签改变背景
if(tt){window.clearInterval(tt);}
}
else{
objid.style.display="block";
objid.style.height = h + "px";
}
}

var tt = window.setInterval(anim,2);
}

// 隐藏列表框
function hiddenList(objid){
var h = objid.offsetHeight;
var anim = function(){
h -= 50; // 每次递减50像素
if(h <= 5){
objid.style.display="none";
getObject('tab'+objid.attributes.getNamedItem('id').value).style.background="url(tab/images/tab_bgs.gif) -14px -114px no-repeat";
if(tt){window.clearInterval(tt);}
}
else{
objid.style.height = h + "px";
}
}

var tt = window.setInterval(anim,2);
}

function showClassList(oid){
var objid=getObject(oid);
if(objid.style.display == "none"){
if(objid.getElementsByTagName("img").length==0)TabNews(oid.substring(0,oid.indexOf("_")),1);
displayList(oid); // 显示内容框
SetCookie(oid+'d',"ture",10000000);
}
else{
if(isNaN(parseInt(maxh[oid]))){

maxh[oid]=objid.offsetHeight; // 内容容器的初始高度

}
hiddenList(objid); // 隐藏内容框
SetCookie(oid+'d',"none",10000000);SetCookie(oid+'h',maxh[oid],10000000);
}
}