本文着重讲解了jQuery实现二级导航菜单的示例，帮助大家理解和制作网页特效，欢迎大家阅读
实用JQ实现导航二级菜单效果，导航菜单在网站中非常常见，有的网站可能会出现三级菜单及多级菜单模式，下面我们来简单的实现一个二级菜单的效果。
部分效果截图：
整体代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>导航菜单案例</title>
<style>
*{
padding: 0;
margin: 0;
}
ul,li{
list-style: none;
}
a{
text-decoration: none;
}
nav{
width: 1140px;
height: 40px;
margin: 0 auto;
border:solid 1px #CCC;
position: relative;
}
nav ul li{
width: 150px;
line-height: 40px;
float: left;
}
nav ul li a{
display: block;
width: 100%;
float: left;
color: #444;
font-size: 14px;
text-align: center;
}
nav>ul>li:hover{
background: #f5f5f5;
}
nav ul li ul{
display: none;
width: 150px;
position: absolute;
background-color: #f5f5f5;
overflow: hidden;
top:41px;
}
nav ul li ul li{
float: left;
border-bottom: solid 1px #CCC;
}
nav ul li ul li:last-child{
border: none;
}
nav>ul>li>ul>li:hover a{
background-color: #444;
color: #FFF;
}
</style>
</head>
<body>
<br />
<br />
<nav>
<ul>
<li><a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 首页">首页</a></li>
<li><a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 联系我们">联系我们</a></li>
<li><a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 在线留言">在线留言</a></li>
<li>
<a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 新闻资讯">新闻资讯</a>
<ul>
<li><a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 国内资讯">国内资讯</a></li>
<li><a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 国内资讯">国内资讯</a></li>
</ul>
</li>
<li>
<a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 产品中心">产品中心</a>
<ul>
<li><a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 除雪机">除雪机</a></li>
<li><a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 运雪车">运雪车</a></li>
</ul>
</li>
<li><a href="" title=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" 案例展示">案例展示</a></li>
</ul>
</nav>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<script>
var $li = $("nav > ul > li");
$li.mouseenter(function () {
$(this).children("ul").stop().slideDown();
});
$li.mouseleave(function () {
$(this).children("ul").stop().slideUp();
});
</script>
</body>
</html>
