jQuery 导航自动跟随滚动的实现代码

时间：2021-05-26

具体代码如下所示：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <c:set var="front" value="${frontPath}${pageContext.request.contextPath}/f"/> <c:set var="ajaxUrl" value="${frontPath}${pageContext.request.contextPath}"/> <c:set var="ctxStatic" value="${pageContext.request.contextPath}/static"/> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"/> <meta name="format-detection" content="telephone=no,email=no,adress=no"/> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no"/> <meta name="apple-mobile-web-app-capable" content="yes"/> <meta name="apple-mobile-web-app-status-bar-style" content="black"/> <title>simpleNavFollowing</title> <style> * { margin: 0; padding: 0; } html, body { position: relative; height: 100%; } #nav { position: fixed; top: 50%; left: 20px; margin-top: -140px; display: inline-block; vertical-align: middle; } #nav a{ display: block; position: relative; width: 98px; height: 28px; line-height: 28px; text-align: center; background-color: #eee; color: #333; border-left: 2px solid transparent; } #nav a:hover{ width: 98px; border-left: 2px solid #4b59ff; } #nav a p{ position: relative; z-index: 3; } #nav a.active{ background-color: #4b59ff; color: #fff; } #main { max-width: 1200px; margin: 0 auto; } #main div { height: 300px; background-color: #efefef; border-top: 1px solid #ccc; } #main div:nth-child(2n) { background-color: #fafafa; } </style> <script src="http:///jquery/jquery-1.10.2.js"></script> <script> $(function () { var nav = $("#nav"); var mainPage = $(".mainPage"); var mainTopArr = new Array(); for(var i=0;i<mainPage.length;i++){ var top = mainPage.eq(i).offset().top; mainTopArr.push(top); } $(window).scroll(function(){ var scrollTop = $(this).scrollTop(); var k; for(var i=0;i<mainTopArr.length;i++){ if(scrollTop>=mainTopArr[i]){ k=i; } } nav.find("a").eq(k).addClass("active").siblings().removeClass("active"); }); nav.find("a[href^='#']").click(function(e){ e.preventDefault(); $('html, body').animate({scrollTop: $(this.hash).offset().top}, 400); }); }); </script> </head> <body> <div id="nav"> <a href="#page1" rel="external nofollow" class="active">page1</a> <a href="#page2" rel="external nofollow" >page2</a> <a href="#page3" rel="external nofollow" >page3</a> <a href="#page4" rel="external nofollow" >page4</a> <a href="#page5" rel="external nofollow" >page5</a> <a href="#page6" rel="external nofollow" >page6</a> <a href="#page7" rel="external nofollow" >page7</a> <a href="#page8" rel="external nofollow" >page8</a> <a href="#page9" rel="external nofollow" >page9</a> <a href="#page10" rel="external nofollow" >page10</a> </div> <div id="main"> <div class="mainPage" id="page1">page1</div> <div class="mainPage" id="page2" style="height: 400px;">page2</div> <div class="mainPage" id="page3">page3</div> <div class="mainPage" id="page4">page4</div> <div class="mainPage" id="page5" style="height: 300px;">page5</div> <div class="mainPage" id="page6">page6</div> <div class="mainPage" id="page7">page7</div> <div class="mainPage" id="page8">page8</div> <div class="mainPage" id="page9" style="height: 900px;">page9</div> <div class="mainPage" id="page10">page10</div> <div class="mainPage" id="page11" style="height: 900px;">page11</div> </div> </body> </html>

总结

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