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代码编辑器：

<!DOCTYPE htm>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.bootcss.com/bootstrap/2.3.2/css/bootstrap.min.css" rel="stylesheet">
<style>body {margin:10px}</style>
<div class="navbar">
    <div class="navbar-inner">
        <div class="container">
            <ul class="nav">
                <a class="brand" href="#">twle</a>
                <li class="active"><a href="#">Home</a></li>
                <li><a href="#">Blog</a></li>
                <li class="dropdown" id="accountmenu">
                    <a class="dropdown-toggle" data-toggle="dropdown" href="#">Tutorials<b class="caret"></b></a>
                    <ul class="dropdown-menu">
                        <li><a href="#">PHP</a></li>
                        <li><a href="#">MySQL</a></li>
                        <li class="divider"></li>
                        <li><a href="#">JavaScript</a></li>
                        <li><a href="#">HTML5</a></li>
                    </ul>
                </li>
            </ul>
        </div>
    </div>
</div>
<script src="/static/lib/bootstrap/2.3.2/docs/assets/js/jquery.js"></script>
<script src="/static/lib/bootstrap/2.3.2/docs/assets/js/bootstrap.min.js"></script>
<script>
$(document).ready(function () {$('.dropdown-toggle').dropdown();});
</script>

代码编辑器：

运行结果：