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jQuery实现的监听导航滚动置顶状态功能示例

程序员文章站 2022-05-16 13:15:39
本文实例讲述了jquery实现的监听导航滚动置顶状态功能。分享给大家供大家参考,具体如下: 1. js代码 /** * created by eduask...

本文实例讲述了jquery实现的监听导航滚动置顶状态功能。分享给大家供大家参考,具体如下:

1. js代码

/**
 * created by eduask on 2016/5/20.
 */
$(function(){
  //引入id标签;
  var navtive=$("#native");
  //设置导航标签为置顶;
  var offsettop=navtive.offset().top;
  //定义一个监听高度;
  var scrollheight=$(document).scrolltop;
  fn(navtive,offsettop);
  //设置监听事件;
  $(window).scroll(function(){
    fn(navtive,offsettop);
  });
  //调用方法;
  function fn(navtive,offsettop){
    var scrollheight=$(document).scrolltop();
    if(offsettop>scrollheight){
      navtive.css("top",offsettop);
    }else{
      navtive.css("top",scrollheight);
    }
  }
});

2. html代码

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>监听导航滚动置顶</title>
  <!--css样式;-->
  <style type="text/css">
    /*添加导航条的样式;
    */
    #native{
      background: blue;
      width: 100%;
      height: 20px;
      color: red;
      position: absolute;
      top: 100px;
      left: 0;
      text-align: center;
    }
  </style>
  <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
  <script type="text/javascript" src="监听导航滚动置顶.js">
  </script>
</head>
<body>
<p id="top">ddddd</p>
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<div id="native">欢迎访问我的导航条</div>
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<a href="#top" rel="external nofollow" >回到顶部</a>
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</body>
</html>

感兴趣的朋友可以使用在线html/css/javascript代码运行工具:http://tools.jb51.net/code/htmljsrun测试运行效果。

更多关于jquery相关内容感兴趣的读者可查看本站专题:《jquery常见事件用法与技巧总结》、《jquery常用插件及用法总结》、《jquery操作json数据技巧汇总》、《jquery扩展技巧总结》、《jquery常见经典特效汇总》及《jquery选择器用法总结

希望本文所述对大家jquery程序设计有所帮助。