js实现菜单折叠导航
<style type="text/css">
<!--
*{margin:0;padding:0;border:0;}
body {
font-family: arial, 宋体, serif;
font-size:12px;
}
#nav {
width:180px;
line-height: 24px;
list-style-type: none;
text-align:left;
/*定义整个ul菜单的行高和背景色*/
}
/*==================一级目录===================*/
#nav a {
width: 160px;
display: block;
padding-left:20px;
/*Width(一定要)，否则下面的Li会变形*/
}
#nav li {
background:#CCC; /*一级目录的背景色*/
border-bottom:#FFF 1px solid; /*下面的一条白边*/
float:left;
/*float：left,本不应该设置，但由于在Firefox不能正常显示
继承Nav的width,限制宽度，li自动向下延伸*/
}
#nav li a:hover{
background:#CC0000; /*一级目录onMouseOver显示的背景色*/
}
#nav a:link {
color:#666; text-decoration:none;
}
#nav a:visited {
color:#666;text-decoration:none;
}
#nav a:hover {
color:#FFF;text-decoration:none;font-weight:bold;
}
/*==================二级目录===================*/
#nav li ul {
list-style:none;
text-align:left;
}
#nav li ul li{
background: #EBEBEB; /*二级目录的背景色*/
}
#nav li ul a{
padding-left:20px;
width:160px;
/* padding-left二级目录中文字向右移动，但Width必须重新设置=(总宽度-padding-left)*/
}
/*下面是二级目录的链接样式*/
#nav li ul a:link {
color:#666; text-decoration:none;
}
#nav li ul a:visited {
color:#666;text-decoration:none;
}
#nav li ul a:hover {
color:#F3F3F3;
text-decoration:none;
font-weight:normal;
background:#CC0000;
/* 二级onmouseover的字体颜色、背景色*/
}
/*==============================*/
#nav li:hover ul {
left: auto;
}
#nav li.sfhover ul {
left: auto;
}
#content {
clear: left;
}
#nav ul.collapsed {
display: none;
}
-->
#PARENT{
width:300px;
padding-left:20px;
}
</style>
<div id="PARENT">
<ul id="nav">
<li><a
href="#Menu=ChildMenu1"
onclick="DoMenu('ChildMenu1')">我的网站</a>
<ul id="ChildMenu1"
class="collapsed">
<li><a href="#">网页教学网</a></li>
<li><a href="#">管理</a></li>
<li><a href="#">网页教学网</a></li>
<li><a href="#">管理</a></li>
<li><a href="#">网页教学网</a></li>
<li><a href="#">管理</a></li>
</ul>
</li>
<li><a
href="#Menu=ChildMenu2" onclick="DoMenu('ChildMenu2')">我的帐务</a>
<ul id="ChildMenu2"
class="collapsed">
<li><a href="#">支付</a></li>
<li><a href="#">管理</a></li>
<li><a href="#">网上支付</a></li>
<li><a href="#">登记汇款</a></li>
<li><a href="#">在线招领</a></li>
<li><a href="#">历史帐务</a></li>
</ul>
</li>
<li><a
href="#Menu=ChildMenu3" onclick="DoMenu('ChildMenu3')">网上视频教程</a>
<ul id="ChildMenu3"
class="collapsed">
<li><a
href="#">Photoshop</a></li>
<a
href="#">Java</a></li>
<li><a
href="#">Asp</a></li>
<li><a
href="#">Javascript</a></li>
</ul>
</li>
<li><a
href="#Menu=ChildMenu4" onclick="DoMenu('ChildMenu4')">在线课程</a>
<ul id="ChildMenu4"
class="collapsed">
<li><a href="#">C语言</a></li>
<a href="#">JAVA语言</a></li>
<li><a
href="#">SQL</a></li>
<li><a
href="#">C#</a></li>
<li><a
href="#">VB</a></li>
</ul>
</li>
</ul>
</div>
<script type=text/javascript><!--
var LastLeftID = "";
function menuFix() {
var obj =
document.getElementById("nav").getElementsByTagName("li");
for (var i=0; i<obj.length; i++) {
obj[i].onmouseover=function() {
this.className+=(this.className.length>0? " ": "") +
"sfhover";
}
obj[i].onMouseDown=function() {
this.className+=(this.className.length>0? " ": "") +
"sfhover";
}
obj[i].onMouseUp=function() {
this.className+=(this.className.length>0? " ": "") +
"sfhover";
}
obj[i].onmouseout=function() {
this.className=this.className.replace(new
RegExp("( ?|^)sfhover//b"), "");
}
}
}
function DoMenu(emid)
{
var obj = document.getElementById(emid);
obj.className =
(obj.className.toLowerCase() ==
"expanded"?"collapsed":"expanded");
if((LastLeftID!="")&&(emid!=LastLeftID))
//关闭上一个Menu
{
document.getElementById(LastLeftID).className = "collapsed";
}
LastLeftID = emid;
}
function GetMenuID()
{
var MenuID="";
var _paramStr = new
String(window.location.href);
var _sharpPos =
_paramStr.indexOf("#");
if (_sharpPos >= 0 && _sharpPos
< _paramStr.length - 1)
{
_paramStr = _paramStr.substring(_sharpPos
+ 1, _paramStr.length);
}
else
{
_paramStr = "";
}
if (_paramStr.length > 0)
{
var _paramArr =
_paramStr.split("&");
if (_paramArr.length>0)
{
var _paramKeyVal =
_paramArr[0].split("=");
if (_paramKeyVal.length>0)
{
MenuID = _paramKeyVal[1];
}
}
/*
if (_paramArr.length>0)
{
var _arr = new
Array(_paramArr.length);
}
//取所有#后面的，菜单只需用到Menu
//for (var i = 0; i < _paramArr.length;
i++)
{
var _paramKeyVal =
_paramArr[i].split('=');
if (_paramKeyVal.length>0)
{
_arr[_paramKeyVal[0]] =
_paramKeyVal[1];
}
}
*/
}
if(MenuID!="")
{
DoMenu(MenuID)
}
}
GetMenuID(); //*这两个function的顺序要注意一下，不然在Firefox里GetMenuID()不起效果
menuFix();
--></script>
