本文實例講述了javascript簡單實現滑動菜單效果的方法。分享給大家供大家參考。具體如下：
整個javascript代碼共42行，其中主要函數Slide代碼26行,可以改進哦！
<!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=utf-8" />
<title>滑動菜單</title>
<style>
a,body,div,h1,h2,li,ul{
margin:0;
padding:0
}
a{display:block;text-decoration:none;height:25px;color:#456;background-color:#ABC;cursor:pointer;}
a:hover{color:#123;background-color:#789;font-weight:bold;}
body{
font:12px/18px "Times New Roman",Times,"宋體",serif;
text-align:center;
}
h1{
height:100px;
width:25px;
position:absolute;
top:-1px;
left:123px;
cursor:pointer;
color:#89A;
font-size:18px;
line-height:50px;
background-color:#234;
}
h2{
height:24px;
font-size:12px;
border-bottom:1px solid #4C6CB9;
color:#BBB;
font-weight:600;
cursor:pointer;
}
li{height:25px;list-style:none}
#Container{width:800px;background-color:#DDD;border: 1px solid #999;margin:10px auto}
#Top{height:30px;background-color:#DDD;border: 1px solid #999;}
#Logo{height:100px;background-color:#DDD;border: 1px solid #999;}
#Nav{height:30px;background-color:#DDD;border: 1px solid #999;}
#SideBar{
position:fixed!important;
position:absolute;
top:200px;
left:0px;
}
#SideBar a,#SideBar h2,#SideBar li,#SideBar ul{width:120px}
#Main{height:800px;background-color:#DDD;border: 1px solid #999;}
#Footer{height:60px;background-color:#DDD;border: 1px solid #999;}
.Extracted{width:0px;}
.Extrended{border:1px solid #555;background-color:#000;padding:1px}
</style>
</head>
<body>
<div id="Container">
<div id="Top">頂條</div>
<div id="Logo">Logo</div>
<div id="Nav">導航條</div>
<div id="SideBar" class="Extrended">
<h1>菜單</h1>
<ul>
<h2>功能欄1</h2>
<li><a href="">功能1</a></li>
<li><a href="">功能2</a></li>
<li><a href="">功能3</a></li>
<li><a href="">功能4</a></li>
<li><a href="">功能5</a></li>
</ul>
<ul>
<h2>功能欄2</h2>
<li><a href="">功能1</a></li>
<li><a href="">功能2</a></li>
<li><a href="">功能3</a></li>
<li><a href="">功能4</a></li>
<li><a href="">功能5</a></li>
</ul>
<ul>
<h2>功能欄3</h2>
<li><a href="">功能1</a></li>
<li><a href="">功能2</a></li>
<li><a href="">功能3</a></li>
<li><a href="">功能4</a></li>
<li><a href="">功能5</a></li>
</ul>
<ul>
<h2>功能欄4</h2>
<li><a href="">功能1</a></li>
<li><a href="">功能2</a></li>
<li><a href="">功能3</a></li>
<li><a href="">功能4</a></li>
<li><a href="">功能5</a></li>
</ul>
<ul>
<h2>功能欄5</h2>
<li><a href="">功能1</a></li>
<li><a href="">功能2</a></li>
<li><a href="">功能3</a></li>
<li><a href="">功能4</a></li>
<li><a href="">功能5</a></li>
</ul>
<ul>
<h2>功能欄6</h2>
<li><a href="">功能1</a></li>
<li><a href="">功能2</a></li>
<li><a href="">功能3</a></li>
<li><a href="">功能4</a></li>
<li><a href="">功能5</a></li>
</ul>
</div>
<div id="Main">內容區</div>
<div id="Footer">底條</div>
</div>
<script type="text/javascript">
function $(e){return document.getElementById(e)}
function Slide(Element,Mod){
var LongthMax,LongthMin,Property,Count=25,Accum,ID,Dlt,DltDlt;
if(Mod){
Property='left';
LongthMax=0;
LongthMin=-124;
}
else{
Property='height';
LongthMax=Element.children.length*25;
LongthMin=25;
}
DltDlt=(LongthMax-LongthMin)/(Count*5);
if(Element.style[Property]==LongthMax+'px')DltDlt=-DltDlt;
Accum=parseInt(Element.style[Property]);
Dlt=7*DltDlt;
ID=setInterval(function(){
if(Count--){
if(!(Count%5))Dlt-=DltDlt;
Accum+=Dlt;
Element.style[Property]=Math.floor(Accum)+'px';
return
}
clearInterval(ID);
Element.style[Property]=(DltDlt>0)? LongthMax+'px':LongthMin+'px';
},20);
}
$('SideBar').style.left='0px';
$('SideBar').children[0].onclick=function(){
Slide(this.parentNode,1);
};
(function(Menu,i,tmp){
Menu=document.getElementsByTagName('ul');
for(i=Menu.length;i--;){
tmp=Menu[i];
tmp.style.overflow='hidden';
tmp.style.height='25px';
tmp.children[0].onclick=function(){
Slide(this.parentNode,0);
};
}
}());
</script>
</body>
</html>
希望本文所述對大家的javascript程序設計有所幫助。