四行jQuery代码实现导航栏下拉菜单功能，jquery实现导航栏下拉菜单的代码！之前写了一篇《使用纯Css实现导航栏下拉菜单功能 网页的导航下拉菜单怎么用Css实现？》一文，使用纯css实现的网站导航栏下拉菜单的效果，只是在栏目中只有一个栏目下有子栏目的实例，如果导航栏中有多个栏目都有子栏目的时候，再使用纯Css来实现就需要写更多的Css代码来实现了，而且如果使用Css来实现导航栏下拉菜单功能，还是没有JS和jQuery的交互效果好，那么浩沐资源网本文将记载如何使用四行jQuery代码实现导航栏下拉菜单功能。
jQuery代码实现导航栏下拉菜单的制作思路
首先，我们需要像《使用纯Css实现导航栏下拉菜单功能 网页的导航下拉菜单怎么用Css实现？》一文中一样将大栏目下的子栏目（第一层ul下li标签里嵌套的ul标签）在Css中将其display属性设置为none，不让下拉菜单中的子栏目显示。当我们需要显示的时候，使用jQuery的鼠标经过的时候mouseover() 方法、children()、和show()方法，让鼠标经过的时候显示；当我们鼠标离开的时候，我们使用jQuery的鼠标离开时候的mouseout()方法、children()、和hide()方法，再进行隐藏。
jQuery实现导航栏下拉菜单的Html（jQuery内嵌在里面）
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css" rel="external nofollow" >
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<title>jQuery制作下拉菜单</title>
</head>
<body>
<header class="header">
<nav class="container">
<ul class="nav">
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a></li>
<li>
<a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >人物</a>
<ul>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >小孩壁纸</a></li>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >纹身壁纸</a></li>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >帅哥壁纸</a></li>
</ul>
</li>
<li>
<a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >壁纸</a>
<ul>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >风景壁纸</a></li>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >建筑壁纸</a></li>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >动物壁纸</a></li>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >人物壁纸</a></li>
</ul>
</li>
<li>
<a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >漫画</a>
<ul>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >日本漫画</a></li>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >中国漫画</a></li>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >韩国漫画</a></li>
<li><a href="#" 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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >欧美漫画</a></li>
</ul>
</li>
</ul>
</nav>
</header>
<footer>
</footer>
<script>
$(function () {
//鼠标经过的时候显示.nav选择器下的li下的ul
$(".nav>li").mouseover(function () {
$(this).children("ul").show();
});
//鼠标离开的时候隐藏.nav选择器下的li下的ul
$(".nav>li").mouseout(function () {
$(this).children("ul").hide();
})
})
</script>
</body>
</html>本实例中使用了百度jQuery的CDN库，在代码块中和之间的为jQuery代码。
jQuery代码实现导航栏下拉菜单css代码
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
font-size: 14px;
color: #666;
}
a {
text-decoration: none;
color: #333;
}
ul li {
list-style: none;
}
.container {
width: 1180px;
margin: 0 auto;
}
.header {
width: 100%;
height: 50px;
line-height: 50px;
font-size: 16px;
font-weight: 500;
background-color: #fff;
}
.header nav a {
color: #fff;
}
.header nav a:hover {
color: rgba(255, 0, 0, 0.5);
background-color: #fff;
}
.header .container .nav {
background-color: rgba(255, 0, 0, 0.6);
}
.header>.container>.nav>li {
display: inline-block;
position: relative;
width: 100px;
text-align: center;
}
.header>.container>.nav>li>a {
padding: 15px 33px;
}
.header>.container>.nav>li>ul {
display: none;
position: absolute;
width: 100%;
text-align: center;
background-color: #000;
}
.header>.container>.nav>li>ul li a {
padding: 13px 17px;
}
.header>.container>.nav>li>ul li a:hover {
border: 1px solid #333;
}jQuery代码实现导航栏下拉菜单效果图
使用jQuery实现导航栏下拉菜单在交互效果上确实要比纯Css实现起来更加的简单，整个核心的jQuery代码也就写了4行，以上本文从jQuery代码实现导航栏下拉菜单的制作思路、jQuery代码实现导航栏下拉菜单Html代码以及jQuery代码实现导航栏下拉菜单Css代码三部分记载了如何使用jQuery实现导航栏下拉菜单功能，希望本文能够帮助到您。
