<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<link href="http://www.happyshow.org/sample/20060615/css/main.css" rel="stylesheet" type="text/css">
<link href="http://www.happyshow.org/sample/20060615/css/class.css" rel="stylesheet" type="text/css">
<script src="http://www.happyshow.org/sample/20060615/nav.js" type="text/javascript"></script>
<script type="text/javascript">
var selectindex = 0; //预设项目
var subclass = new Array()
subclass[0] = "<ol><li>·电影</li><li>·餐厅</li><li>·演出</li></ol>";
subclass[1] = "<ol><li>·项链</li><li>·戒指</li><li>·耳环</li></ol>"
subclass[2] = "<ol><li>·吃饭</li><li>·旅游</li></ol>"
subclass[3] = "<ol><li>·万年历</li><li>·我的生日</li><li>·她的生日</li></ol>"
subclass[4] = "<ol><li>·金牛座</li><li>·射手座</li><li>·蝎子座</li><li>·水瓶座</li></ol>"
</script>
</head>
<body onload="preset()">
<div id="con">
<div id="logo">
<img src="http://www.happyshow.org/sample/20060615/images/logo1.gif" width="94" height="75" border="0" align="bottom" />
<img src="http://www.happyshow.org/sample/20060615/images/logo2.gif" width="108" height="63" border="0" align="bottom" style="margin-top:12px;"/>
<div id="search">
<input name="userpass2" type="text" class="inputbox1" id="userpass2" /><img src="http://www.happyshow.org/sample/20060615/images/searchbutton.gif" width="31" height="18" /></div>
<div id="nav" >
<ul id="itemlist" onmouseout="recover()">
<li><a href="http://www.happyshow.org/sample/20060615/index.html"><span onmouseover="focusthis(this)" class="style0">约会安排</span></a></li>
<li><a href="http://www.happyshow.org/sample/20060615/index2.html"><span onmouseover="focusthis(this)" class="style0">礼物安排</span></a></li>
<li><a href="#"><span onmouseover="focusthis(this)" class="style0">话题安排</span></a></li>
<li><a href="#"><span onmouseover="focusthis(this)" class="style0">日历</span></a></li>
<li><a href="#"><span onmouseover="focusthis(this)" class="style0">测试星座</span></a></li>
<li><a href="#"><span style="width:15px;padding:0px" class="style0"> </span></a></li>
</ul>
</div>
</div>
<div id="subclass"> </div>
<div id="content" onmouseover="recover()">
我的博客：<br />
<a href="http://www.happyshow.org" target="_blank">http://www.happyshow.org</a><br>
<br />
<br />
<br />
导航条的三种状态：<br /><br />
<h5 class="style0">style0</h5>
<h5 class="style1">style1</h5>
<h5 class="style2">style2</h5>
</div>
</div>
</body>
</html>
[Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]
已经封装成 js 文件的代码：
// JavaScript Document
function preset()
{
document.getElementById("itemlist").childNodes[selectindex].firstChild.firstChild.className="style1";
document.getElementById("itemlist").childNodes[selectindex+1].childNodes[0].childNodes[0].className="style2";
innersubclass();
}
function focusthis(obj)
{
clearselect();
obj.className = "style1";
obj.parentNode.parentNode.nextSibling.firstChild.firstChild.
className="style2";
innersubclass(obj);
}
function innersubclass(obj)
{
if (obj==null)
{
document.getElementById("subclass").innerHTML = subclass[selectindex];
}else
{
for(i=0; i<obj.parentNode.parentNode.parentNode.childNodes.length;i++)
{
if(obj == document.getElementById("itemlist").childNodes[i].firstChild.firstChild)
{
document.getElementById("subclass").innerHTML = subclass[i];
}
}
}
}
function recover()
{
clearselect();
preset();
innersubclass();
}
function clearselect()
{
for (i=0; i<document.getElementById("itemlist").childNodes.length; i++)
{
document.getElementById("itemlist").childNodes[i].firstChild.firstChild.className="style0";
}
}
在代码编写过程中，发现 Firefox 对 DOM 解释和 IE 对 DOM 的解释差别较大。虽然上面的代码也兼容ff，但实现的方法不太标准，近期需要补习一下 FF 下的DOM。
目前此效果仅能应用于网站导航条，如果要做成斜体的选项卡效果，还需要调整一下代码，但估计不用重写了，呵呵
