這是一款自己寫的仿天貓的菜單效果，二級分類的功能已經(jīng)實(shí)現(xiàn)，但沒有美化，留著用的朋友自己完善吧，JS功能已經(jīng)實(shí)現(xiàn)，鼠標(biāo)移在主分類上，二級分類向右伸出展開，目前淘寶網(wǎng)、天貓購物、京東都在用的導(dǎo)航菜單特效，測試時(shí)候請先點(diǎn)擊一下菜單，主菜單就顯示出來了。

運(yùn)行效果截圖如下：

在線演示地址如下：

http://demo.jb51.net/js/2015/js-css-ftamil-web-menu-style-codes/

具體代碼如下：

<!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=utf-8" />
<title>仿天貓側(cè)邊網(wǎng)頁菜單</title>
<style type="text/css">
*{margin:0; padding:0;}
body{ font-size:14px; font-family:"宋體";}
h1, h2, h3{ font-size:14px; font-weight:normal;}
li{ list-style:none;}
a{ color:#333; text-decoration:none;}
#nav{ width:202px; height:35px; background:#C00; margin:50px 0 0 20px;}
#nav h1{ padding-left:17px; line-height:35px; color:#fff; margin-right:17px;}
#box{ width:200px; border:1px solid #B00; border-top:none; margin-left:20px; display:none;}
#subnav{width:200px;}
#subnav .list{ width:200px; height:30px;}
#subnav .list h2{ width:160px; height:30px; padding-left:30px; line-height:30px; margin-right:10px;}
#subnav .list a:hover, #subnav .active a:hover{ color:#900; font-weight:bold;}
#subnav .active{ width:200px; height:30px; border-bottom:1px solid #b00; border-top:1px solid #b00; position:relative;}
#subnav .active h2{ width:170px; height:30px; padding-left:30px; line-height:30px; background:#fff; position:absolute; left:1px; top:0; z-index:4;}
#subnav .list_nav{ width:500px; overflow:hidden; border:1px solid #b00; position:absolute; left:200px; top:-1px; z-index:3; display:none;}
</style>
<script type="text/javascript">
window.onload=function()
{
 var oNav=document.getElementById('nav');
 var oBox=document.getElementById('box');
 var oSubnav=document.getElementById('subnav');
 var aLi=oSubnav.getElementsByTagName('li');
 var i=0;
 oNav.onclick=function()
 {
  if(oBox.style.display=='block')
  {
   oBox.style.display='none';
  }
  else
  {
   oBox.style.display='block';
  }
 }
 for(i=0;i<aLi.length;i++)
 {
  if(aLi[i].className=='list')
  {
   aLi[i].onmousemove=function()
   {
    for(i=0;i<aLi.length;i++)
    {
     var aDivList=this.getElementsByTagName('div')[0];
     aDivList.style.display='block';
     this.className='active';
    }
   }
   aLi[i].onmouseout=function()
   {
    for(i=0;i<aLi.length;i++)
    {
     var aDivList=this.getElementsByTagName('div')[0];
     aDivList.style.display='none';
     this.className='list';  
    }
   }
  }
 }
};
</script>
</head>
<body>
<div id="nav">
<h1>所有商品分類</h1>
</div>
<div id="box">
 <ul id="subnav">
  <li class="list">
   <h2><a href="#">服飾內(nèi)衣、鞋靴運(yùn)動</a></h2>
   <div class="list_nav">
    <ul>
     <li>1</li>
     <li>1</li>
     <li>1</li>
     <li>1</li>
    </ul>
   </div>
  </li>
  <li class="list">
   <h2><a href="#">電子商品</a></h2>
   <div class="list_nav">
    <ul>
     <li>222</li>
     <li>2222</li>
     <li>2222</li>
     <li>22222</li>
    </ul>
   </div>
  </li>
  <li class="list">
   <h2><a href="#">服飾內(nèi)衣、鞋靴運(yùn)動</a></h2>
   <div class="list_nav">
    <ul>
     <li>3333</li>
     <li>3333</li>
     <li>3333</li>
     <li>3333</li>
    </ul>
   </div>
  </li>
  <li class="list">
   <h2><a href="#">服飾內(nèi)衣、鞋靴運(yùn)動</a></h2>
   <div class="list_nav">
    <ul>
     <li>1</li>
     <li>1</li>
     <li>1</li>
     <li>1</li>
    </ul>
   </div>
  </li>
 </ul>
</div>
</body>
</html>

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

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