非常小巧的JS下拉菜单代码

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以下是非常小巧的JS下拉菜单代码的示例演示效果:

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HTML代码(index.html):

<!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" />
<meta name="keywords" content="JS代码,菜单导航,JS广告代码,JS特效代码" />
<meta name="description" content="此代码内容为非常小巧的JS下拉菜单代码，属于站长常用代码" />
<title>非常小巧的JS下拉菜单代码</title>
<link rel="stylesheet" type="text/css" href="css/lrtk.css">
<!-- 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>
</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="#" target="_blank">lanrentuku.com</a>
		</div>
	</li>
</ul>
<div style="clear:both"></div>
</body>
</html>

CSS代码(lrtk.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}

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