Example code sharing for dynamically fixed top of scroll bar-HTML Tutorial-php.cn

Example code sharing for dynamically fixed top of scroll bar

零下一度

Release： 2017-07-18 16:36:10

Original

1763 people have browsed it

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>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <p>其他内容</p>
    <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 = &#39;fixed&#39;;
          bignav.style.top = &#39;0&#39;;
          bignav.style.zIndex = &#39;9999&#39;;
        }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 = &#39;static&#39;;
        }
      }
    </script>
  </body>
</html>

Copy after login

The above is the detailed content of Example code sharing for dynamically fixed top of scroll bar. For more information, please follow other related articles on the PHP Chinese website!