本文實例講述了基于jQuery實現的向下滑動二級菜單效果代碼。分享給大家供大家參考。具體如下：
這是一款使用jQuery制作向下滑動的二級菜單，本二級菜單帶有動畫效果，而且比較流暢，鼠標放在一級菜單上，就可以向下滑出二級子菜單，相對實用。
運行效果截圖如下：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/jquery-show-down-style-menu-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>向下滑動的二級菜單</title><style type="text/css">body{ margin:0px; padding:0px; font-family: Arial, Helvetica, sans-serif; background-color:#dedede; color:#333333; position:relative;}a{ text-decoration:none;}h1,h2,h3,li,ul,dd,dt,dl,input{ margin:0px; padding:0px; list-style:none;}.clear{ clear:both; width:0px; height:0px; line-height:0px; overflow:hidden; font-size:0px; display:block;}img {border: none;}.top{ width:890px; height:68px; margin:0px auto; padding:10px 0px 2px 0px; background-color:#FFFFFF;}.logo{ width:269px; height:68px; padding:0px 8px 0px 3px; float:left;}.logo h1{ width:269px; height:68px; background-image:url(images/logo.gif); background-repeat:no-repeat;}.logo h1 a{ display:block; width:269px; height:68px; line-height:68px; font-size:14px; text-indent:-999px;}.topad{ width:610px; height:68px; float:left;}.dh{ width:890px; height:39px;margin:0px auto; background-image:url(images/nvabg.gif); background-repeat:repeat-x;}.nav{ width:785px; height:38px; padding:1px 0px 0px 15px; float:left;}.nav li{ height:38px; line-height:38px; float:left; font-size:14px; padding:0px 20px; color:#FFFFFF; position:relative;}.nav li a{ color:#FFFFFF;}.nav li a:hover{ text-decoration:underline; font-size:16px;}.nav li .ttg{ height:auto; background-color:#FFFFFF; FILTER: alpha(opacity=80); opacity: 0.8; -moz-opacity: 0.8; position:absolute; left:0px; top:37px; z-index:1; width:150px; padding:10px 0px; -webkit-border-radius:5px; -moz-border-radius:5px; border-radius:5px; box-shadow:2px 2px 3px #666666; display:none;}.nav li .ttg li{ width:120px; line-height:30px; font-size:16px; padding:0px 10px; font-family:"微軟雅黑";}.nav li .ttg li a{ color:#000;}.sc{ width:90px; height:38px; line-height:38px; float:left; font-size:14px; color:#FFFFFF; text-align:center;}.sc a{ color:#FFFFFF;}.sc a:hover{ text-decoration:underline;}.ad{ width:890px; height:auto; margin:10px auto;}.ad img{ float: left; width:445px; overflow:hidden;}</style><script type="text/javascript" src="jquery-1.6.2.min.js"></script><script type="text/javascript">$(document).ready(function(){ $(".nav li").hover(function(){ $(this).find(".ttg").slideToggle(500); });});</script></head><body><div class="top"><div class="logo"><h1><a href="#" title="">網站標題文字</a></h1></div><div class="topad"></div><div class="clear"></div></div><div class="dh"><div class="nav"><ul><li><a href="#" title="首頁">首頁</a><div class="ttg"><ul><li><a href="#" title="蛋白粉">蛋白粉</a></li><li><a href="#" title="健身計劃">健身計劃</a></li><li><a href="#" title="熱門標簽">熱門標簽</a></li></ul></div></li><li><a href="#" title="蛋白粉">蛋白粉</a><div class="ttg"><ul><li><a href="#" title="蛋白粉">乳清蛋白粉</a></li><li><a href="#" title="熱門標簽">增肌粉</a></li></ul></div></li><li><a href="#" title="健身計劃">健身計劃</a><div class="ttg"><ul><li><a href="#" title="蛋白粉">胸肌鍛煉</a></li><li><a href="#" title="熱門標簽">小腿鍛煉</a></li><li><a href="#" title="熱門標簽">腹肌鍛煉</a></li></ul></div></li></ul></div><div class="clear"></div></div></body></html>希望本文所述對大家的jquery程序設計有所幫助。
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