<title>Bootstrap 示例 - 输入框组中分割的下拉菜单按钮</title>
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div style="padding: 100px 100px 10px;">
<form class="bs-example bs-example-form" role="form">
<div class="input-group">
<div class="input-group-btn">
<button type="button" class="btn btn-default" tabindex="-1">下拉菜单
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" tabindex="-1">
<span class="caret"></span>