只展开一个：
<!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" xml:lang="UTF-8">
< head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-Language" content="UTF-8" />
<title>www.flyso.cn-后台菜单管理</title>
<style type="text/css">
body {margin:0;text-align:center;color:#000;font:normal 12px Arial,Verdana,Tahoma;text-align:center;background:#C8D0D5;line-height:150%;}
a:link,a:visited {color:#385065;text-decoration:none}
a:hover {text-decoration:underline}
#menu {width:150px;margin:0px 15px;padding:0px;text-align:left;list-style:none}
#menu .item {margin:5px 0px;padding:0px;list-style:none}
a.title:link, a.title:visited, a.title:hover {display:block;background:url(myfile/images/t1.gif) no-repeat;color:#385065;font-weight:bold;padding:2px 0 0 22px;width:128px;line-height:23px;cursor:pointer;text-decoration:none}
#menu .item ul {border:1px solid #9FACB7;margin:0;width:118px;padding:3px 0px 3px 30px;background:#fff;list-style:none;display:none}
#menu .item ul li {display:block;}
</style>
<script language="javascript" type="text/javascript">
// --- 获取ClassName
document.getElementsByClassName = function(cl) {
var retnode = [];
var myclass = new RegExp('\\b'+cl+'\\b');
var elem = this.getElementsByTagName('*');
for (var j = 0; j < elem.length; j++) {
var classes = elem[j].className;
if (myclass.test(classes)) retnode.push(elem[j]);
}
return retnode;
}
// --- 隐藏所有
function HideAll() {
var items = document.getElementsByClassName("optiton");
for (var j=0; j<items.length; j++) {
items[j].style.display = "none";
}
}
// --- 设置cookie
function setCookie(sName,sValue,expireHours) {
var cookieString = sName + "=" + escape(sValue);
//;判断是否设置过期时间
if (expireHours>0) {
var date = new Date();
date.setTime(date.getTime + expireHours * 3600 * 1000);
cookieString = cookieString + "; expire=" + date.toGMTString();
}
document.cookie = cookieString;
}
//--- 获取cookie
function getCookie(sName) {
var aCookie = document.cookie.split("; ");
for (var j=0; j < aCookie.length; j++){
var aCrumb = aCookie[j].split("=");
if (escape(sName) == aCrumb[0])
return unescape(aCrumb[1]);
}
return null;
}
window.onload = function() {
var show_item = "opt_1";
if (getCookie("show_item") != null) {
show_item= "opt_" + getCookie("show_item");
}
document.getElementById(show_item).style.display = "block";
var items = document.getElementsByClassName("title");
for (var j=0; j<items.length; j++) {
items[j].onclick = function() {
var o = document.getElementById("opt_" + this.name);
if (o.style.display != "block") {
HideAll();
o.style.display = "block";
setCookie("show_item",this.name);
}
else {
o.style.display = "none";
}
}
}
}
</script>
< /head>
< body>
< ul id="menu">
<li><a href="javascript:void(0)" name="1">基本信息</a>
<ul id="opt_1">
<li><a href="#">企业简介</a></li>
<li><a href="#">企业新闻</a></li>
</ul>
</li>
<li><a href="javascript:void(0)" name="2">系统管理</a>
<ul id="opt_2">
<li><a href="#">企业简介</a></li>
<li><a href="#">企业新闻</a></li>
</ul>
</li>
<li><a href="javascript:void(0)" name="3">系统管理</a>
<ul id="opt_3">
<li><a href="#">会员管理</a></li>
<li><a href="#">管理员设置</a></li>
<li><a href="#">权限组设置</a></li>
<li><a href="#">退出系统</a></li>
</ul>
</li>
< /ul>
< /body>
< /html>
全展开：
<!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" xml:lang="UTF-8"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="UTF-8" /> <title>后台管理</title> <style type="text/css"> body {margin:0;text-align:center;color:#000;font:normal 12px Arial,Verdana,Tahoma;text-align:center;background:#C8D0D5;line-height:150%;} a:link,a:visited {color:#385065;text-decoration:none} a:hover {text-decoration:underline} #menu {width:150px;margin:0px 15px;padding:0px;text-align:left;list- style:none} #menu .item {margin:5px 0px;padding:0px;list-style:none} a.title:link, a.title:visited, a.title:hover {display:block;background:url(myfile/images/t1.gif) no-repeat;color:#385065;font-weight:bold;padding:2px 0 0 22px;width:128px;line-height:23px;cursor:pointer;text-decoration:none} #menu .item ul {border:1px solid #9FACB7;margin:0;width:118px;padding:3px 0px 3px 30px;background:#fff;list-style:none;display:none} #menu .item ul li {display:block;} </style> <script language="javascript" type="text/javascript"> // --- 获取ClassName document.getElementsByClassName = function(cl) { var retnode = []; var myclass = new RegExp('\\b'+cl+'\\b'); var elem = this.getElementsByTagName('*'); for (var j = 0; j < elem.length; j++) { var classes = elem[j].className; if (myclass.test(classes)) retnode.push(elem[j]); } return retnode; } // --- 隐藏所有 function HideAll() { var items = document.getElementsByClassName("optiton"); for (var j=0; j<items.length; j++) { items[j].style.display = "none"; } } // --- 设置cookie function setCookie(sName,sValue,expireHours) { var cookieString = sName + "=" + escape(sValue); //;判断是否设置过期时间 if (expireHours>0) { var date = new Date(); date.setTime(date.getTime + expireHours * 3600 * 1000); cookieString = cookieString + "; expire=" + date.toGMTString(); } document.cookie = cookieString; } //--- 获取cookie function getCookie(sName) { var aCookie = document.cookie.split("; "); for (var j=0; j < aCookie.length; j++){ var aCrumb = aCookie[j].split("="); if (escape(sName) == aCrumb[0]) return unescape(aCrumb[1]); } return null; } window.onload = function() { var show_item = "opt_1"; if (getCookie("show_item") != null) { show_item= "opt_" + getCookie("show_item"); } document.getElementById("opt_1").style.display = "block"; document.getElementById("opt_2").style.display = "block"; document.getElementById("opt_3").style.display = "block"; var items = document.getElementsByClassName("title"); for (var j=0; j<items.length; j++) { items[j].onclick = function() { var o = document.getElementById("opt_" + this.name); if (o.style.display != "block") { <!--HideAll();--> o.style.display = "block"; setCookie("show_item",this.name); } else { o.style.display = "none"; } } } } </script> </head> <body> <ul id="menu"> <li><a href="javascript:void(0)" name="1">基本信息</a> <ul id="opt_1"> <li><a href="#">企业简介</a></li> <li><a href="#">企业新闻</a></li> </ul> </li> <li><a href="javascript:void(0)" name="2">系统管理</a> <ul id="opt_2"> <li><a href="#">企业简介</a></li> <li><a href="#">企业新闻</a></li> </ul> </li> <li><a href="javascript:void(0)" name="3">系统管理</a> <ul id="opt_3"> <li><a href="#">会员管理</a></li> <li><a href="#">管理员设置</a></li> <li><a href="#">权限组设置</a></li> <li><a href="#">退出系统</a></li> </ul> </li> </ul> </body> </html>