<!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>JavaScript橫向滑出的多級(jí)菜單</title>
<style>
* {padding:0; margin:0}
body {font:12px Verdana, Arial, Helvetica}
#wrapper {width:750px; padding:25px; margin:0 auto}
#leftcolumn {float:left; width:225px}
#rightcolumn {float:left; width:525px}
.dropdown {display:block; position:relative}
.dropdown dt {width:188px; border:2px solid #9ac1c9; padding:8px; font-weight:bold; cursor:pointer; background:url(images/header.gif)}
.dropdown .upperdd {border-bottom:none}
.dropdown dt:hover {background:url(images/header_over.gif)}
.dropdown dd {position:absolute; top:0; overflow:hidden; width:208px; display:none; background:#fff; opacity:0}
.dropdown ul {width:204px; border:2px solid #9ac1c9; list-style:none}
.dropdown li {display:inline}
.dropdown a, .dropdown a:active, .dropdown a:visited {display:block; padding:5px; color:#333; text-decoration:none; background:#eaf0f2; width:194px}
.dropdown a:hover {background:#d9e1e4; color:#000}
.dropdown .underline {border-bottom:1px solid #b9d6dc}
</style>
<script type="text/javascript">
var DDSPEED = 10;
var DDTIMER = 15;
var OFFSET = -2;
var ZINT = 100;
function ddMenu(id,d){
 var h = document.getElementById(id + '-ddheader');
 var c = document.getElementById(id + '-ddcontent');
 clearInterval(c.timer);
 if(d == 1){
  clearTimeout(h.timer);
  c.style.display = 'block';
  if(c.maxh && c.maxh <= c.offsetHeight){return}
  else if(!c.maxh){
   c.style.left = (h.offsetWidth + OFFSET) + 'px';
   c.style.height = 'auto';
   c.maxh = c.offsetHeight;
   c.style.height = '0px';
  }
  ZINT = ZINT + 1;
  c.style.zIndex = ZINT;
  c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
 }else{
  h.timer = setTimeout(function(){ddCollapse(c)},50);
 }
}
function ddCollapse(c){
 c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}
function cancelHide(id){
 var h = document.getElementById(id + '-ddheader');
 var c = document.getElementById(id + '-ddcontent');
 clearTimeout(h.timer);
 clearInterval(c.timer);
 if(c.offsetHeight < c.maxh){
  c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
 }
}
function ddSlide(c,d){
 var currh = c.offsetHeight;
 var dist;
 if(d == 1){
  dist = Math.round((c.maxh - currh) / DDSPEED);
 }else{
  dist = Math.round(currh / DDSPEED);
 }
 if(dist <= 1 && d == 1){
  dist = 1;
 }
 c.style.height = currh + (dist * d) + 'px';
 c.style.opacity = currh / c.maxh;
 c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
 if(currh > (c.maxh - 2) && d == 1){
  clearInterval(c.timer);
 }else if(dist < 1 && d != 1){
  clearInterval(c.timer);
  c.style.display = 'none';
 }
}
</script>
</head>
<body>
<div id="wrapper">
<div id="leftcolumn">
 <dl class="dropdown">
  <dt id="one-ddheader" class="upperdd" onmouseover="ddMenu('one',1)" onmouseout="ddMenu('one',-1)">我們首頁</dt>
  <dd id="one-ddcontent" onmouseover="cancelHide('one')" onmouseout="ddMenu('one',-1)">
   <ul>
    <li><a href="#" class="underline">腳本主頁</a></li>
    <li><a href="#" class="underline">網(wǎng)頁特效</a></li>
    <li><a href="#">腳本下載</a></li>
   </ul>
  </dd>
 </dl>
 <dl class="dropdown">
  <dt id="two-ddheader" class="upperdd" onmouseover="ddMenu('two',1)" onmouseout="ddMenu('two',-1)">網(wǎng)站導(dǎo)航</dt>
  <dd id="two-ddcontent" onmouseover="cancelHide('two')" onmouseout="ddMenu('two',-1)">
   <ul>
    <li><a href="#" class="underline">ASP</a></li>
    <li><a href="#" class="underline">PHP</a></li>
    <li><a href="#" class="underline">.NET</a></li>
    <li><a href="#">網(wǎng)站留言</a></li>
   </ul>
  </dd>
 </dl>
 <dl class="dropdown">
  <dt id="three-ddheader" class="upperdd">最新下載</dt>
 </dl>
 <dl class="dropdown">
  <dt id="four-ddheader" onmouseover="ddMenu('four',1)" onmouseout="ddMenu('four',-1)">歡迎回來</dt>
  <dd id="four-ddcontent" onmouseover="cancelHide('four')" onmouseout="ddMenu('four',-1)">
   <ul>
    <li><a href="#" class="underline">歡迎再來</a></li>
    <li><a href="#">慢走，不送</a></li>
   </ul>
  </dd>
 </dl>
</div>
</div>
</body>
</html>

希望本文所述對(duì)大家的JavaScript程序設(shè)計(jì)有所幫助。

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