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jQuery實(shí)現(xiàn)的監(jiān)聽導(dǎo)航滾動(dòng)置頂狀態(tài)功能示例

發(fā)布時(shí)間：2020-08-28 21:15:48 來源：腳本之家 閱讀：270 作者：金含 欄目：web開發(fā)

本文實(shí)例講述了jQuery實(shí)現(xiàn)的監(jiān)聽導(dǎo)航滾動(dòng)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.
 */
$(function(){
  //引入id標(biāo)簽;
  var navtive=$("#native");
  //設(shè)置導(dǎo)航標(biāo)簽為置頂;
  var offsetTop=navtive.offset().top;
  //定義一個(gè)監(jiān)聽高度;
  var scrollHeight=$(document).scrollTop;
  fn(navtive,offsetTop);
  //設(shè)置監(jiān)聽事件;
  $(window).scroll(function(){
    fn(navtive,offsetTop);
  });
  //調(diào)用方法;
  function fn(navtive,offsetTop){
    var scrollHeight=$(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(dǎo)航滾動(dòng)置頂</title>
  <!--css樣式;-->
  <style type="text/css">
    /*添加導(dǎo)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(dǎo)航滾動(dòng)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(dǎo)航條</div>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<a href="#top" rel="external nofollow" >回到頂部</a>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<p>aaaaaaaaaaaa</p>
<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(yùn)行工具：http://tools.jb51.net/code/HtmlJsRun測(cè)試運(yùn)行效果。

更多關(guān)于jQuery相關(guān)內(nèi)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(jié)》、《jQuery常用插件及用法總結(jié)》、《jQuery操作json數(shù)據(jù)技巧匯總》、《jQuery擴(kuò)展技巧總結(jié)》、《jQuery常見經(jīng)典特效匯總》及《jquery選擇器用法總結(jié)》

希望本文所述對(duì)大家jQuery程序設(shè)計(jì)有所幫助。

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