本文實例講述了javascript實現帶下拉子菜單的導航菜單效果。分享給大家供大家參考。具體實現方法如下：
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<html xmlns="http://www.w3.org/1999/xhtml">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>帶下拉子菜單的導航菜單</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 () {
this.className += (this.className.length > 0 ? " " : "") + "sfhover";
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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>
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<ul>
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希望本文所述對大家的javascript程序設計有所幫助。