先来看看演示代码。
代码语言：javascript复制<!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>非常小巧的JS下拉菜单代码</title>
<!-- dd menu -->
<script type="text/javascript">
<!--
var timeout = 500;
var closetimer = 0;
var ddmenuitem = 0;
// open hidden layer
function mopen(id)
{
// cancel close timer
mcancelclosetime();
// close old layer
if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
// get new layer and show it
ddmenuitem = document.getElementById(id);
ddmenuitem.style.visibility = 'visible';
}
// close showed layer
function mclose()
{
if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}
// go close timer
function mclosetime()
{
closetimer = window.setTimeout(mclose, timeout);
}
// cancel close timer
function mcancelclosetime()
{
if(closetimer)
{
window.clearTimeout(closetimer);
closetimer = null;
}
}
// close layer when click-out
document.onclick = mclose;
// -->
</script>
<style type="text/css">
<!--
#sddm{ margin: 0 auto;padding: 0;z-index: 30;background-color:#F4F4F4;width: 480px;height:23px;}
#sddm li{ margin: 0;padding: 0;list-style: none;float: left;font: bold 12px arial}
#sddm li a{ display: block;margin: 0 1px 0 0;padding: 4px 10px;width: 60px;background: #5970B2;color: #FFF;text-align: center;text-decoration: none}
#sddm li a:hover{ background: #49A3FF}
#sddm div{ position: absolute;visibility: hidden;margin: 0;padding: 0;background: #EAEBD8;border: 1px solid #5970B2}
#sddm div a{ position: relative;display: block;margin: 0;padding: 5px 10px;width: auto;white-space: nowrap;text-align: left;text-decoration: none;background: #EAEBD8;color: #2875DE;font: 12px arial}
#sddm div a:hover{ background: #49A3FF;color: #FFF}
-->
</style>
</head>
<body style="text-align:center">
<ul id="sddm">
<li><a href="#" onmouseover="mopen('m1')" onmouseout="mclosetime()">Home</a>
<div id="m1" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">HTML DropDown</a>
<a href="#">DHTML DropDown menu</a>
<a href="#">JavaScript DropDown</a>
<a href="#">DropDown Menu</a>
<a href="#">CSS DropDown</a>
</div>
</li>
<li><a href="#" onmouseover="mopen('m2')" onmouseout="mclosetime()">Download</a>
<div id="m2" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">ASP Dropdown</a>
<a href="#">Pulldown menu</a>
<a href="#">AJAX dropdown</a>
<a href="#">DIV dropdown</a>
</div>
</li>
<li><a href="#" onmouseover="mopen('m3')" onmouseout="mclosetime()">Order</a>
<div id="m3" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">Visa Credit Card</a>
<a href="#">Paypal</a>
</div>
</li>
<li><a href="#" onmouseover="mopen('m4')" onmouseout="mclosetime()">Help</a>
<div id="m4" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">Download Help File</a>
<a href="#">Read online</a>
</div>
</li>
<li><a href="#" onmouseover="mopen('m5')" onmouseout="mclosetime()">Contact</a>
<div id="m5" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">E-mail</a>
<a href="#">Submit Request Form</a>
<a href="http://www.lanrentuku.com/" target="_blank">lanrentuku.com</a>
</div>
</li>
</ul>
<div style="clear:both"></div>
</body>
</html>从代码中我们可以发现，下拉列表是ID为M下的A标签
那么，我们只要循环显示这个A标签就可以做到下拉效果了
实现方法：
代码语言：javascript复制<?php global $CACHE;
$sort_cache = $CACHE->readCache('sort');
foreach($sort_cache as $value): ?>
<a href="<?php echo Url::sort($value['sid']); ?>" title="<?php echo $value['sortname']; ?>"><?php echo $value['sortname']; ?></a>
<?php endforeach; ?>上面的函数就可以显示EMLOG的分类，当然，你也可以再调用比如标签TAG也可以
EM模板实现方法：
代码语言：javascript复制<ul id="sddm">
<li><a href="<?php echo BLOG_URL; ?>" title="<?php echo $blogname; ?>">首页</a></li>
<li><a href="#" onmouseover="mopen('m1')" onmouseout="mclosetime()">分类</a>
<div id="m1" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<?php global $CACHE;
$sort_cache = $CACHE->readCache('sort');
foreach($sort_cache as $value): ?>
<a href="<?php echo Url::sort($value['sid']); ?>" title="<?php echo $value['sortname']; ?>"><?php echo $value['sortname']; ?></a>
<?php endforeach; ?>
</div>
</li>
<li><a href="#" onmouseover="mopen('m2')" onmouseout="mclosetime()">管理</a>
<div id="m2" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<?php if(ROLE == 'admin' || ROLE == 'writer'): ?>
<a href="<?php echo BLOG_URL; ?>admin/write_log.php">写日志</a>
<a href="<?php echo BLOG_URL; ?>admin/">管理中心</a>
<a href="<?php echo BLOG_URL; ?>admin/?action=logout">退出</a>
<?php else: ?>
<a href="<?php echo BLOG_URL; ?>admin/">登录</a>
<?php endif; ?>
</div>
</li>
</ul>这只简单举例的一个方法罢了，关于美化等自己捣鼓了，记得加CSS和JS代码，简单吧，快去试试吧，效果不错哦
