编程学习网为您整理以下代码实例，主要实现：Bootstrap .dropup类，希望可以帮到各位朋友。
<!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>
<p>Dropup</p>
<div class = "row" style = "margin-left:50px; margin-top:120px">
<div class = "btn-group dropup">
<button type = "button" class = "btn btn-primary dropdown-toggle" data-toggle = "dropdown">
Subject
<span class = "caret"></span>
</button>
<ul class = "dropdown-menu" role = "menu">
<li><a href = "#">Programming</a></li>
<li><a href = "#">Web Dev</a></li>
<li><a href = "#">Database</a></li>
<li><a href = "#">Networking</a></li>
</ul>
</div>
</div>
</body>
</HTML>
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