本文實例講述了jQuery實現的監聽導航滾動置頂狀態功能。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; //定義一個監聽高度; var scrollHeight=$(document).scrollTop; fn(navtive,offsetTop); //設置監聽事件; $(window).scroll(function(){ fn(navtive,offsetTop); }); //調用方法; function fn(navtive,offsetTop){ var scrollHeight=$(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><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>
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