內容說明
效果： 頁面中有導航欄，當頁面滾動超出一定範圍時，它會固定在設置好的位置，一般是固定在頂部。
![在這裏插入圖片描述]()
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery實現在鼠標滾動後導航欄保持固定</title>
<style>
* {
padding: 0;
margin: 0
}
ul, li {
list-style: none;
}
a {
text-decoration: none;
color: #333;
}
.content {
width: 1200px;
margin: auto;
}
.menu {
line-height: 60px;
height: 60px;
}
.menu li {
float: left;
padding: 0 15px;
}
.sticky {
position: fixed;
height: auto;
z-index: 10000;
background-color: #2778af;
width: 100%;
top: 0px;
background-color: rgba(30, 30, 30, 0.94);
border-bottom: none;
padding: 0;
-webkit-transition: all 0.5s ease-in-out;
-moz-transition: all 0.5s ease-in-out;
-ms-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
transition: all 0.5s ease-in-out;
}
.sticky a {
color: #fff;
}
.con {
min-height: 2000px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/2.1.0/jquery.js"></script>
<script>
$(window).scroll(function() {
var wScroll = $(this).scrollTop();
if (wScroll > 0) {
$('.menu-box').addClass('sticky');
} else {
$('.menu-box').removeClass('sticky');
}
});
</script>
</head>
<body>
<div class="menu-box">
<div class="content">
<ul class="menu">
<li><a href="home">首頁</a></li>
<li><a href="life">走進航大</a></li>
<li><a href="direction">報考指南</a></li>
<li><a href="college">學院介紹</a></li>
<li><a href="type">招生類型</a></li>
</ul>
</div>
</div>
<div class="con"></div>
</body>
</html>
