Example code sharing for dynamically fixed top of scroll bar
Share the example code for dynamically fixed top of the scroll bar. The code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>js滚动到指定位置导航栏固定顶部</title>
<style type="text/css">
body{height: 2500px; margin: 0; padding: 0;}
.banner{height: 250px; width: 100%; background: #e5e5e5;}
.bignav{width: 100%; background: #000;}
.nav{ background:#000; width: 1200px; margin: 0 auto; height: 45px;}
.nav a{display: block; width: 200px;float: left; color: #fff; text-decoration: none; text-align: center; line-height: 45px;}
</style>
</head>
<body>
<div class="banner">
</div>
<div class="bignav" id="bignav">
<div class="nav">
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a>
</div>
</div>
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<script type="text/javascript">
window.onscroll=function(){
var topScroll =document.body.scrollTop;//滚动的距离,距离顶部的距离
var bignav = document.getElementById("bignav");//获取到导航栏id
if(topScroll > 250){ //当滚动距离大于250px时执行下面的东西
bignav.style.position = 'fixed';
bignav.style.top = '0';
bignav.style.zIndex = '9999';
}else{//当滚动距离小于250的时候执行下面的内容，也就是让导航栏恢复原状
bignav.style.position = 'static';
}
}
</script>
</body>
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