案例：Bootstrap案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<head>
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    <meta charset="utf-8">
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    <title>Bootstrap 实例 - 默认的导航栏</title>
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    <link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">
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    <script src="/js/bootstrap/jquery.min.js"></script>
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    <script src="/js/bootstrap/bootstrap3.3.7.min.js"></script>
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</head>
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<body>
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​
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<nav class="navbar navbar-default" role="navigation">
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    <div class="container-fluid">
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    <div class="navbar-header">
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        <a class="navbar-brand" href="#">W3xue教程</a>
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    </div>
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    <div>
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        <ul class="nav navbar-nav">
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            <li class="active"><a href="#">iOS</a></li>
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            <li><a href="#">SVN</a></li>
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            <li class="dropdown">
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                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
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                    Java
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                    <b class="caret"></b>
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                </a>
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                <ul class="dropdown-menu">
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                    <li><a href="#">jmeter</a></li>
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                    <li><a href="#">EJB</a></li>
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                    <li><a href="#">Jasper Report</a></li>
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                    <li class="divider"></li>
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                    <li><a href="#">分离的链接</a></li>
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                    <li class="divider"></li>
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                    <li><a href="#">另一个分离的链接</a></li>
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                </ul>
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            </li>
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        </ul>
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    </div>
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    </div>
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</nav>
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​
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</body>
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</html>