Bootstrap Scrollspy（刷新）

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      <a class = "navbar-brand" href = "#">Tutorial Name</a>
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      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#ios">iOS</a></li>
         <li><a href = "#svn">SVN</a></li>

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            <a href = "#" id = "navbarDrop1" class = "dropdown-toggle" data-toggle  = "dropdown">
               Java 
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               <li><a href = "#jmeter" tabindex = "-1">jmeter</a></li>
               <li><a href = "#ejb" tabindex = "-1">ejb</a></li>

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               <li><a href = "#spring" tabindex = "-1">spring</a></li>
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      <h4 id = "ios">iOS<small><a href = "#" onclick = "removeSection(this);">
         &times; Remove this section</a></small>
      </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>
   </div>

   <div class = "section">
      <h4 id = "svn">SVN<small></small></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>
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   <div class = "section">
      <h4 id = "jmeter">jMeter<small><a href = "#" onclick = "removeSection(this);">
         &times; Remove this section</a></small>
      </h4>

      <p>jMeter is an Open Source testing software. It is 100% pure Java 
         application for load and performance testing.</p>
   </div>

   <div class = "section">
      <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>

   <div class = "section">
      <h4 id = "spring">Spring</h4>

      <p>Spring framework is an open source Java platform that provides 
         comprehensive infrastructure support for developing robust Java 
         applications very easily and very rapidly.</p>

      <p>Spring framework was initially written by Rod Johnson and was first 
         released under the Apache 2.0 license in June 2003.</p>
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