本文实例讲述了js实现适用于素材网站的黑色多级菜单导航条效果。分享给大家供大家参考。具体如下：
这是一款适用于素材网站的黑色多级菜单导航条，无需jQuery，采用CSS+javaScript来实现，整体效果非常棒，用来学习CSS也是很不错的。
运行效果截图如下：
在线演示地址如下：
http://demo.VeVB.COm/js/2015/js-black-color-nav-style-codes/
具体代码如下：
<!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="#">武林网</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="#">武林网</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="#">武林网</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="#">武林网</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="#">武林网</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>希望本文所述对大家的javascript程序设计有所帮助。
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