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 - 输入框组中分割的下拉菜单按钮</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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<div style="padding: 100px 100px 10px;">
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    <form class="bs-example bs-example-form" role="form">
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        <div class="row">
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            <div class="col-lg-6">
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                <div class="input-group">
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                    <div class="input-group-btn">
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                        <button type="button" class="btn btn-default" tabindex="-1">下拉菜单
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                        </button>
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                        <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" tabindex="-1">
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                            <span class="caret"></span>
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                            <span class="sr-only">切换下拉菜单</span>
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                        </button>
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                        <ul class="dropdown-menu">
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                            <li><a href="#">功能</a></li>
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                            <li><a href="#">另一个功能</a></li>
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                            <li><a href="#">其他</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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                        </ul>
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                    </div><!-- /btn-group -->
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                    <input type="text" class="form-control">
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                </div><!-- /input-group -->
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            </div><!-- /.col-lg-6 --><br>
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            <div class="col-lg-6">
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                <div class="input-group">
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                    <input type="text" class="form-control">
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                    <div class="input-group-btn">
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                        <button type="button" class="btn btn-default" tabindex="-1">下拉菜单
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                        </button>
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                        <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" tabindex="-1">
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                            <span class="caret"></span>
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                            <span class="sr-only">切换下拉菜单</span>
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                        </button>
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                        <ul class="dropdown-menu pull-right">
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                            <li><a href="#">功能</a></li>
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                            <li><a href="#">另一个功能</a></li>
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                            <li><a href="#">其他</a></li>