.input-group——设置div为输入框组；

.input-group-lg、.input-group-sm、.input-group-xs——改变输入框组的尺寸；

.input-group-addon——在输入框前或后加入额外内容；

.input-group-btn——在输入框前或后加入button或button式下拉菜单组件。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>组件_输入框组</title>
    <link rel="stylesheet" href="bootstrap.min.css" type="text/css">
    <!--<link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">-->
    <script src="jquery-1.11.1.min.js"></script>
    <script src="bootstrap.min.js"></script>
</head>
<body>
<div class="container">
    <p>
        <div class="input-group">
            <span class="input-group-addon">$</span>
            <input type="number" class="form-control"/>
            <span class="input-group-addon">.00</span>
        </div>
    </p>
    <p>
    <div class="input-group input-group-lg">
        <span class="input-group-addon">$</span>
        <input type="number" class="form-control"/>
        <span class="input-group-addon">.00</span>
    </div>
    </p>
    <p>
        <div class="row">
            <div class="col-md-4">
                <div class="input-group">
                    <span class="input-group-addon">
                        <input class="checkbox" type="checkbox"/>
                    </span>
                    <input type="text" class="form-control"/>
                </div>
            </div>
            <div class="col-md-4">
                <div class="input-group">
                    <input type="text" class="form-control" placeholder="马上查询"/>
                    <span class="input-group-btn">
                        <button class="btn btn-primary" type="button" >Go!</button>
                    </span>
                </div>
            </div>
            <div class="col-md-4">
                <div class="input-group">
                    <div class="input-group-btn">
                        <button class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
                            产品分类
                            <span class="caret"></span>
                        </button>
                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#" role="menuitem">男装</a></li>
                            <li><a href="#" role="menuitem">女装</a></li>
                            <li><a href="#" role="menuitem">童装</a></li>
                        </ul>
                    </div>
                    <input type="text" class="form-control" placeholder="清凉一夏">
                </div>
            </div>
        </div>
    </p>
</div>

</body>
</html>

Bootstrap组件之输入框组_css