这种效果在b2c商城经常用的到，刚结束的项目就用到了，简单分享下。
Demo：http://www.ostools.net/jsbin/uiafeaei/1
<!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>无标题文档</title>
<style type="text/css">
ul{margin:0;padding:0;list-style-type:none;}
a{ text-decoration:none;}
.mold_open_hover,.mold_open{background-image:url(../image/open.png);background-repeat:none;display:inline-block;width:10px;height:6px;margin-left:10px;position:relative;top:-2px;}
.mold_open{background-position:0 -6px;}
.mold_open_hover{background-position:0 0;}
.mod-menu{position:relative;z-index:1000;left:-1px;margin-left:100px;}
h1{margin-left:100px;}
.menu-cont-list a:hover{text-decoration:underline;}
.mod-menu .menu-item{width:220px;border-top:solid 1px #d59bb2;border-bottom:solid 2px #d59bb2;position:relative;z-index:22;}
.mod-menu .menu-item li{height:47px;line-height:47px;background:#feebf3;border-top:solid 1px #f0bfd3;}
.mod-menu .menu-item li.mouse-bg{background:url(../image/mouse-menu-bg.jpg) no-repeat #fff;position:relative;z-index:22;margin-right:-4px;}
.mod-menu .menu-item a{color:#c81d61;font-size:16px;padding-left:33px;display:block;height:45px;border-top:solid 1px #f1f2f7;}
.mod-menu .menu-item a:hover{ text-decoration:none;}
.mod-menu .menu-cont{position:absolute;left:220px;top:1px;background:#fff;width:573px;border:solid 1px #F0BFD3;box-shadow:2px 0 10px rgba(210,33,103,0.25);z-index:20;}
.mod-menu .menu-cont-list{padding:0 30px;}
.mod-menu .menu-cont-list li{border-bottom:dotted 1px #f0bfd3;padding:10px 0;}
.mod-menu .menu-cont-list li:last-child{border-bottom:none;}
.mod-menu .menu-cont-list h3{font-size:14px;font-weight:700;}
.mod-menu .menu-cont-list h3 a{color:#222;}
.mod-menu .menu-list-link a{color:#666;line-height:24px;}
.mod-menu .menu-list-link .long-string{color:#ccc;font-size:12px;padding:0 10px;}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
var mod_menu=$(".mod-menu");//导航模块区
var menu=function(){
var menuItem=$(".menu-item li");//选择导航列表
menuItem.each(function(){
var _index=$(this).index();//获取当前选择菜单列表的索引
$(this).mouseenter(function(){
var y = $(this).position().top+1;//获取当前鼠标滑过的列表的顶部坐标
$(".menu-cont").show();
$(".menu-cont").css("top",y);//需要显示的对应索引内容
$(this).addClass("mouse-bg").siblings().removeClass("mouse-bg");
$(".menu-cont>div").eq(_index).show().siblings().hide();
});
});/*导航菜单菜单*/
$(".mod-menu").mouseleave(function(){
$(".menu-cont").hide();
menuItem.removeClass("mouse-bg");
})
}//展开二级菜单
menu();//执行展开二级菜单函
});
</script>
</head>
<body>
<h1>简单的2级菜单导航</h1>
<div class="mod-menu f-l">
<div id="column-left">
<ul class="menu-item">
<li class=""><a href="trade-wedding.html">Wedding</a></li>
<li class=""><a href="trade-occasion-dresses.html">Occasion Dresses</a></li>
<li class=""><a href="trade-women-s-clothing.html">Women's Clothing</a></li>
<li class=""><a href="trade-women-s-shoes.html">Women's Shoes</a></li>
<li class=""><a href="trade-accessories.html">Accessories</a></li>
<li class=""><a href="trade-beauty-health.html">Beauty & Health</a></li>
</ul><!--一级菜单列表-->
<div class="menu-cont hide" style="display: none; top: 241px;">
<div class="menu-cont-list" style="display: none;">
<ul>
<li>
<h3><a href="wedding-dresses-c1_2.html">Wedding Dresses</a></h3>
<div class="menu-list-link"></div>
</li>
<li>
<h3><a href="bridesmaid-dresses-c1_3.html">Bridesmaid Dresses</a></h3>
<div class="menu-list-link"></div>
</li>
<li>
<h3><a href="wedding-party-dresses-c1_4.html">Wedding Party Dresses</a></h3>
<div class="menu-list-link">
<a title="" href="mother-of-the-brides-dresses-c1_4_36.html">Mother of the Brides Dresses</a>
<span class="long-string">|</span>
<a title="" href="flower-girl-dresses-c1_4_37.html">Flower Girl Dresses</a>
<span class="long-string">|</span>
<a title="" href="wedding-guest-dresses-c1_4_38.html">Wedding Guest Dresses</a>
</div>
</li>
<li>
<h3><a href="wedding-accessories-c1_6.html">Wedding Accessories</a></h3>
<div class="menu-list-link">
<a title="" href="fabric-swatch-c1_6_100.html">Fabric Swatch</a>
<span class="long-string">|</span>
<a title="" href="bridal-lingerie-c1_6_101.html">Bridal Lingerie</a>
<span class="long-string">|</span>
<a title="" href="wedding-veils-c1_6_48.html">Wedding Veils</a>
<span class="long-string">|</span>
<a title="" href="wedding-gloves-c1_6_51.html">Wedding Gloves</a>
<span class="long-string">|</span>
<a title="" href="wedding-shawls-c1_6_47.html">Wedding Shawls</a>
<span class="long-string">|</span>
<a title="" href="wedding-flowers-c1_6_52.html">Wedding Flowers</a>
<span class="long-string">|</span>
<a title="" href="wedding-petticoats-c1_6_120.html">Wedding Petticoats</a>
</div>
</li>
</ul>
</div>
<div class="menu-cont-list" style="display: none;">
<ul>
<li>
<h3><a href="prom-dresses-c103_39.html">Prom Dresses</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="military-ball-dresses-c103_118.html">Military Ball Dresses</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="evening-dresses-c103_40.html">Evening Dresses</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="cocktail-dresses-c103_41.html">Cocktail Dresses</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="ball-gowns-c103_43.html">Ball Gowns</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="homecoming-dresses-c103_44.html">Homecoming Dresses</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="little-black-dresses-c103_45.html">Little Black Dresses </a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="quinceanera-dresses-c103_46.html">Quinceanera Dresses</a></h3>
<div class="menu-list-link">
</div>
</li>
</ul>
</div>
<div class="menu-cont-list" style="display: none;">
<ul>
<li>
<h3><a href="dresses-c7_8.html">Dresses</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="clubwear-c7_9.html">Clubwear</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="leggings-c7_12.html">Leggings</a></h3>
<div class="menu-list-link">
</div>
</li>
<li>
<h3><a href="lingeries-c7_13.html">L
本文主要包含二级菜单,导航等相关知识,佚名 希望在学习及工作中可以帮助到您