本文实例讲述了jQuery实现向下滑出的二级菜单效果。分享给大家供大家参考。具体如下：
这里用jQuery实现向下滑出的二级菜单代码，滑出菜单，鼠标放在主菜单的任意一项上，就会向下滑出二级的子菜单。当然本代码只是一个演示，有些菜单是随便弄的，经过测试，兼容IE8、火狐和Chrome等浏览器，有兴趣的你可以自己试下。
运行效果截图如下：
在线演示地址如下：
http://demo.VeVB.COm/js/2015/jquery-down-show-2menu-style-codes/
具体代码如下：
<!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><title>jQuery缓慢弹出下拉导航</title><style>*{margin:0;padding:0;list-style-type:none;}a,img{border:0;text-decoration:none;}body{ font: 12px/180% Arial, Helvetica, sans-serif, "新宋体"; background-color: #E8E8E8; }.clearfix:after{content:".";display:block;height:0;clear:both;visibility:hidden}.clearfix{display:inline-table}*html .clearfix{height:1%}.clearfix{display:block}*+html .clearfix{min-height:1%}/* nav_menu */.nav_menu{ height: 42px; background-color: #333333; }.nav{width:1006px;height:41px;position:relative;margin:0 auto;}.nav .list li{float:left;}.nav .list a{float:left;display:block;width:125px;height:42px;text-align:center;font:bold 13px/36px "微软雅黑";color:#fff;}.nav .list a:hover{color:#FFA304;}.nav .list a:hover,.nav .list .now{color:#F00;background:#fff;}.nav .box{position:absolute;left:-5px;top:42px;width:1006px;background:#FFF;overflow:hidden;height:0;filter:alpha(opacity=0);opacity:0;border-bottom:2px solid #074c52;}.nav .cont{position:relative;padding:25px 0 0px 24px;}/* sublist */.sublist li{float:left;width:168px;padding-right:24px;padding-bottom:24px;}.sublist li h3.mcate-item-hd{font-family:'微软雅黑';padding-left:2px;font-size:14px;height:26px;line-height:26px;border-bottom:1px dashed #666666;}.sublist li p.mcate-item-bd{padding-left:2px;}.sublist li p.mcate-item-bd a{height:26px;line-height:26px;margin-right:5px;font-size:12px;color:#666666;text-decoration:none;display:inline-block;}.sublist li p.mcate-item-bd a:hover{color:#6c5143;text-decoration:underline;}</style><script type="text/javascript" src="jquery-1.6.2.min.js"></script></head><body><div class="nav_menu"> <div class="nav"> <div class="list" id="navlist"> <ul id="navfouce"> <li><a href="#">公司概况</a></li> <li><a href="#">产品展示</a></li> <li><a href="#">新闻动态</a></li> <li><a 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href="#">羽绒</a> <a href="#">呢大衣</a> <a href="#">毛衣</a> </p> </li> <li> <h3 class="mcate-item-hd"><span>鞋 箱包</span></h3> <p class="mcate-item-bd"> <a href="#">女鞋</a> <a href="#">男鞋</a> <a href="#">箱包</a> <a href="#">女包</a> <a href="#">男包</a> <a href="#">旅行箱</a> <a href="#">钱包 </a> </p> </li> <li> <h3 class="mcate-item-hd"><span>珠宝、手表</span></h3> <p class="mcate-item-bd"> <a href="#">饰品</a> <a href="#">项链</a> <a href="#">珠宝</a> <a href="#">钻石</a> <a href="#">手表</a> </p> </li> <li> <h3 class="mcate-item-hd"><span>化妆品</span></h3> <p class="mcate-item-bd"> <a href="#">护肤</a> <a href="#">彩妆</a> <a href="#">香水</a> <a href="#">男士</a> <a href="#">精油</a> <a href="#">假发</a> <a href="#">美体</a> <a href="#">试用服务</a> </p> </li> <li> <h3 class="mcate-item-hd"><span>运动 户外</span></h3> <p class="mcate-item-bd"> <a href="#">运动鞋</a> <a href="#">运动服</a> <a href="#">运动用品</a> <a href="#">户外</a> </p> </li> </ul> </div> <div class="cont" style="display:none;">3<br />3</div> <div class="cont" style="display:none;">4<br />3<br />4</div> <div class="cont" style="display:none;">5</div> <div class="cont" style="display:none;">6<br />3<br />3</div> <div class="cont" style="display:none;">7<br />3<br />3<br />3</div> </div> </div></div><script type="text/javascript">(function(){ var time = null; var list = $("#navlist"); var box = $("#navbox"); var lista = list.find("a"); for(var i=0,j=lista.length;i<j;i++){ if(lista[i].className == "now"){ var olda = i; } } var box_show = function(hei){ box.stop().animate({ height:hei, opacity:1 },400); } var box_hide = function(){ box.stop().animate({ height:0, opacity:0 },400); } lista.hover(function(){ lista.removeClass("now"); $(this).addClass("now"); clearTimeout(time); var index = list.find("a").index($(this)); box.find(".cont").hide().eq(index).show(); var _height = box.find(".cont").eq(index).height()+54; box_show(_height) },function(){ time = setTimeout(function(){ box.find(".cont").hide(); box_hide(); },50); lista.removeClass("now"); 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