滚动间谍（自动更新导航）插件可让您根据滚动目标定位页面的各个部分
位置。在其基本实现中，滚动时，您可以根据以下内容将.active类添加到导航栏
滚动位置。
您可以尝试运行以下代码以在Bootstrap中实现scrollspy插件-
<!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <link href = "/bootstrap/css/bootstrap.min.css" rel = "stylesheet"> <script src = "/scripts/jquery.min.js"></script> <script src = "/bootstrap/js/bootstrap.min.js"></script> </head> <body> <nav id = "navbar-example" class = "navbar navbar-default navbar-static" role = "navigation"> <div class = "navbar-header"> <button class = "navbar-toggle" type = "button" data-toggle = "collapse" data-target = ".bs-js-navbar-scrollspy"> <span class = "sr-only">Toggle navigation</span> <span class = "icon-bar"></span> <span class = "icon-bar"></span> <span class = "icon-bar"></span> </button> <a class = "navbar-brand" href = "#">Tutorial Name</a> </div> <div class = "collapse navbar-collapse bs-js-navbar-scrollspy"> <ul class = "nav navbar-nav"> <li><a href = "#ios">iOS</a></li> <li><a href = "#svn">SVN</a></li> <li class = "dropdown"> <a href = "#" id = "navbarDrop1" class = "dropdown-toggle" data-toggle = "dropdown"> Java <b class = "caret"></b> </a> <ul class = "dropdown-menu" role = "menu" aria-labelledby = "navbarDrop1"> <li><a href = "#jmeter" tabindex = "-1">jmeter</a></li> <li><a href = "#ejb" tabindex = "-1">ejb</a></li> </ul> </li> </ul> </div> </nav> <div data-spy = "scroll" data-target = "#navbar-example" data-offset = "0" style = "height:200px; overflow:auto; position: relative;"> <h4 id = "ios">iOS</h4> <p>iOS is a mobile operating system developed and distributed by Apple Inc. Originally released in 2007 for the iPhone, iPod Touch, and Apple TV. iOS is derived from OS X, with which it shares the Darwin foundation. iOS is Apple's mobile version of the OS X operating system used on Apple computers.</p> <h4 id = "svn">SVN</h4> <p>Apache Subversion which is often abbreviated as SVN, is a software versioning and revision control system distributed under an open source license. Subversion was created by CollabNet Inc. in 2000, but now it is developed as a project of the Apache Software Foundation, and as such is part of a rich community of developers and users.</p> <h4 id = "jmeter">jMeter</h4> <p>jMeter is an Open Source testing software. It is 100% pure Java application for load and performance testing.</p> <h4 id = "ejb">EJB</h4> <p>Enterprise Java Beans (EJB) is a development architecture for building highly scalable and robust enterprise level applications to be deployed on J2EE compliant Application Server such as JBOSS, Web Logic etc.</p> </div> </body> </html>