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jQuery實現(xiàn)的監(jiān)聽導航滾動置頂狀態(tài)功能示例

 更新時間：2018年07月23日 11:32:06   作者：金含  
這篇文章主要介紹了jQuery實現(xiàn)的監(jiān)聽導航滾動置頂狀態(tài)功能,涉及基于jQuery的事件響應及狀態(tài)監(jiān)聽等相關操作技巧,需要的朋友可以參考下

本文實例講述了jQuery實現(xiàn)的監(jiān)聽導航滾動置頂狀態(tài)功能。分享給大家供大家參考，具體如下：

1. js代碼

/**
 * Created by EDUASK on 2016/5/20.
 */
$(function(){
  //引入id標簽;
  var navtive=$("#native");
  //設置導航標簽為置頂;
  var offsetTop=navtive.offset().top;
  //定義一個監(jiān)聽高度;
  var scrollHeight=$(document).scrollTop;
  fn(navtive,offsetTop);
  //設置監(jiān)聽事件;
  $(window).scroll(function(){
    fn(navtive,offsetTop);
  });
  //調用方法;
  function fn(navtive,offsetTop){
    var scrollHeight=$(document).scrollTop();
    if(offsetTop>scrollHeight){
      navtive.css("top",offsetTop);
    }else{
      navtive.css("top",scrollHeight);
    }
  }
});

2. html代碼

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>監(jiān)聽導航滾動置頂</title>
  <!--css樣式;-->
  <style type="text/css">
    /*添加導航條的樣式;
    */
    #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="監(jiān)聽導航滾動置頂.js">
  </script>
</head>
<body>
<p id="top">ddddd</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<div id="native">歡迎訪問我的導航條</div>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
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<p>aaaaaaaaaaaa</p>
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<p>aaaaaaaaaaaa</p>
<a href="#top" rel="external nofollow" >回到頂部</a>
<p>aaaaaaaaaaaa</p>
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<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
</body>
</html>

感興趣的朋友可以使用在線HTML/CSS/JavaScript代碼運行工具：http://tools.jb51.net/code/HtmlJsRun測試運行效果。

更多關于jQuery相關內容感興趣的讀者可查看本站專題：《jQuery常見事件用法與技巧總結》、《jQuery常用插件及用法總結》、《jQuery操作json數據技巧匯總》、《jQuery擴展技巧總結》、《jQuery常見經典特效匯總》及《jquery選擇器用法總結》

希望本文所述對大家jQuery程序設計有所幫助。

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