本文实例讲述了javascript实现带下拉子菜单的导航菜单效果。分享给大家供大家参考。具体实现方法如下：
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>带下拉子菜单的导航菜单</title>
<style type="text/css">
body { font-family: Verdana; font-size: 12px; line-height: 1.5; }
a { color: #000; text-decoration: none; }
a:hover { color: #F00; }
#menu { width:500px; height:28px; margin:0 auto; border-bottom:3px solid #E10001;}
#menu ul { list-style: none; margin: 0px; padding: 0px; }
#menu ul li { float:left; margin-left:2px;}
#menu ul li a { display:block; width:87px; height:28px; line-height:28px; text-align:center; font-size:14px;}
#menu ul li a#current { font-weight:bold; color:#fff;}
#menu ul li ul { border:1px solid #ccc; display:none; position:absolute;}
#menu ul li ul li { float:none; width:87px; background:#eee; margin:0;}
#menu ul li ul li a { background:none;}
#menu ul li ul li a:hover { background:#333; color:#fff;}
#menu ul li:hover ul { display:block;}
#menu ul li.sfhover ul { display:block;}
</style>
<script type="text/javascript"><!-- //--><![CDATA[//><!--
function menuFix() {
var sfEls = document.getElementById("menu").getElementsByTagName("li");
for (var i = 0; i < sfEls.length; i++) {
sfEls[i].onmouseover = function () {
this.className += (this.className.length > 0 ? " " : "") + "sfhover";
}
sfEls[i].onMouseDown = function () {
this.className += (this.className.length > 0 ? " " : "") + "sfhover";
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sfEls[i].onMouseUp = function () {
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sfEls[i].onmouseout = function () {
this.className = this.className.replace(new RegExp("( ?|^)sfhover\\b"),
"");
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window.onload = menuFix;
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</script>
</head>
<body>
<div id="menu">
<ul>
<li><a id="current" href="#">首页</a></li>
<li><a href="#">网页版式</a>
<ul>
<li><a href="#">自适应宽度</a></li>
<li><a href="#">固定宽度</a></li>
</ul>
</li>
<li><a href="#">web教程</a>
<ul>
<li><a href="#">新手入门</a></li>
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</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。
