我正在将Twitter的Bootstrap应用于我的Ruby on Rails教程项目（作者：Michael Hartl），上层导航没有崩溃。
我现在得到这个：

我的最终目标是：

我已经将start_template. html复制并粘贴到我的文件中，确保引用了所有正确的bootstrap.css和js文件，但不知道如何解决这个问题。
My home.html粘贴在下面（如果代码太多，请道歉）：

<title> Project Name</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <link href="http://twitter.github.io/bootstrap/assets/css/bootstrap.css" rel="stylesheet">

    <link href="http://twitter.github.io/bootstrap/assets/css/bootstrap-responsive.css" rel="stylesheet">

  <link href="/assets/application.css?body=1" media="all" rel="stylesheet" type="text/css" />
<link href="/assets/custom.css?body=1" media="all" rel="stylesheet" type="text/css" />
<link href="/assets/static_pages.css?body=1" media="all" rel="stylesheet" type="text/css" />

  <meta content="authenticity_token" name="csrf-param" />
<meta content="khAXbodB/h2ghLK1iZlFZIU6RtxF1kv//qsyrJVszlE=" name="csrf-token" />


<div class="navbar navbar-inverse navbar-fixed-top">
  <div class="navbar-inner">
    <div class="container">
      <button type="button" class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>

      <a class="brand" href="#">Project Name</a>

      <div class="nav-collapse collapse">
        <ul class="nav">
            <li> <a href="/">Home</a> </li>
            <li><a href="/about">About</a></li>
            <li> <a href="/help">Help</a> </li>
            <li> <a href="#">Sign In</a> </li>
        </ul>
      </div>
    </div>
  </div>
</div>


    <div class="container-fluid">
        <div class="center hero-unit">
<h1>Project Name</h1>
<h2>Subheader and more info</h2>

    <a href="#" class="btn btn-large btn-primary">Sign Up Now!</a>
</div>

        <script src="/assets/jquery.js?body=1" type="text/javascript"></script>
<script src="/assets/jquery_ujs.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-alert.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-button.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-carousel.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-collapse.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-dropdown.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-modal.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-popover.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-scrollspy.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-tab.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-tooltip.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-transition.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap-typeahead.js?body=1" type="text/javascript"></script>
<script src="/assets/bootstrap.js?body=1" type="text/javascript"></script>
<script src="/assets/static_pages.js?body=1" type="text/javascript"></script>
<script src="/assets/application.js?body=1" type="text/javascript"></script>

</div>