本文實例講述了js實作適用於素材網站的黑色多層選單導航條效果。分享給大家供大家參考。具體如下：
這是一款適用於素材網站的黑色多層選單導航條，無需jQuery，採用CSS javaScript來實現，整體效果非常棒，用來學習CSS也是很不錯的。
運作效果截圖如下：
線上示範網址如下：
http://demo.jb51.net/js/2015/js-black-color-nav-style-codes/
具體程式碼如下：
<!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>css+js打造超酷黑灰色二级横向下拉导航菜单</title>
<style>
body{margin:0;padding:0;color:#000;}
#mainHeader{width:100%;z-index:3020;position:relative;}
#mainHeader ul,#mainHeader li{position:relative;margin:0;padding:0;list-style:none;z-index:3020;}
#headerTop{background:#222;background:linear-gradient(bottom,#171717 0,#222 10%);background:-moz-linear-gradient(bottom,#171717 0,#222 10%);background:-webkit-gradient(linear,left bottom,left top,color-stop(0,#171717),color-stop(10%,#222));z-index:3020;height:52px;}
#headerBottom{border-top:1px solid #4f4f4f;border-bottom:1px solid #000;position:relative;height:34px;background:#2c2c2c;background:linear-gradient(top,#3c3c3c 0,#1d1d1d 100%);background:-moz-linear-gradient(top,#3c3c3c 0,#1d1d1d 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(0,#3c3c3c),color-stop(100%,#1d1d1d));z-index:3010;}
#navmenu{width:900px;margin:0 auto;position:relative;font-size:14px;}
#navmenu li{display:block;position:relative;float:left;border-top:0;border-left:1px solid #454545;border-bottom:0;border-right:1px solid #151515;xheight:18px;}
#navmenu li a{text-shadow:1px 1px 1px black;display:block;padding:8px 18px;color:#fff;text-decoration:none;white-space:nowrap;}
#navmenu li a:hover{padding-top:5px;border-top:3px solid #ff0000;}
.newSash{position:relative;}
.newSash .newSashSpan{background:url(images/newSashRed.gif) top left no-repeat;width:26px;height:26px;position:absolute;top:-1px;right:0;}
.downArrow{display:block;border-color:#fff transparent transparent transparent;border-style:solid;border-width:3px;height:0;width:0;position:absolute;top:16px;right:8px;_border:none;}
#navmenu div{position: absolute;visibility: hidden; padding: 0;margin-left:-1px;margin-top:2px; background: #313131;border:1px solid #222;}
#navmenudiv a{position: relative;display: block;margin: 0;padding: 8px 10px;border-bottom:1px solid #fff;width: auto;white-space: nowrap;text-align: left;text-decoration: none;background: #666;color: #fff;}
#navmenu div a:hover{background: #222;border-top:none;border-left:3px solid #ff0000;color: #FFF;padding: 8px 10px;}
</style>
<script type="text/javascript">
var timeout = 500;
var closetimer = 0;
var ddmenuitem = 0;
function mopen(id)
{
mcancelclosetime();
if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
ddmenuitem = document.getElementById(id);
ddmenuitem.style.visibility = 'visible';
}
function mclose()
{
if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}
function mclosetime()
{
closetimer = window.setTimeout(mclose, timeout);
}
function mcancelclosetime()
{
if(closetimer)
{
window.clearTimeout(closetimer);
closetimer = null;
}
}
document.onclick = mclose;
</script>
</head>
<body style="text-align:center">
<div id="mainHeader" >
<div id="headerTop"></div>
<div id="headerBottom">
<ul id="navmenu">
<li><a href="#" onmouseover="mopen('m1')" onmouseout="mclosetime()">网站首页<span class="downArrow"></span></a>
<div id="m1" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">脚本之家</a>
<a href="#">电子商务</a>
<a href="#">网络营销人才</a>
<a href="#">导航条代码</a>
<a href="#">网站营销</a> </div>
</li>
<li><a href="#" onmouseover="mopen('m2')" onmouseout="mclosetime()">导航条代码<span class="downArrow"></span></a>
<div id="m2" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">脚本之家</a>
<a href="#">电子商务</a>
<a href="#">网络营销人才</a>
<a href="#">导航条代码</a>
<a href="#">网站营销</a> </div>
</li>
<li><a href="#" onmouseover="mopen('m3')" onmouseout="mclosetime()">网页素材<span class="downArrow"></span></a>
<div id="m3" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">脚本之家</a>
<a href="#">电子商务</a>
<a href="#">网络营销人才</a>
<a href="#">导航条代码</a>
<a href="#">网站营销</a> </div>
</li>
<li class="newSash"><a href="#">脚本之家</a><span class="newSashSpan"></span>
</li>
<li><a href="#" onmouseover="mopen('m4')" onmouseout="mclosetime()">开源源码<span class="downArrow"></span></a>
<div id="m4" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
<a href="#">脚本之家</a>
<a href="#">电子商务</a>
<a href="#">网络营销人才</a>
<a href="#">导航条代码</a>
<a href="#">网站营销</a> </div>
</li>
<li><a href="#">网站营销</a>
</li>
<li><a href="#">网站建设</a>
</li>
</ul>
</div>
</div>
</div>
<br><br><br><br>
<p><p>非常小巧的JS下拉菜单代码，兼容：IE6+, Firefox 1.5+, Opera 8+, Safari 3+, Chrome 0.2+</p></p>
</body>
</html>
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希望本文所述對大家的javascript程式設計有所幫助。
