<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8"> 
        <title>Bootstrap 实例 - 表单控件大小</title>
        <link rel="stylesheet" href="//cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">  
        <script src="//cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
        <script src="//cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
    </head>
    <body>

        <form role="form">
            <div class="form-group">
                <input class="form-control input-lg" type="text" placeholder=".input-lg">
            </div>
            <div class="form-group">
                <input class="form-control" type="text" placeholder="默认输入">
            </div>
            <div class="form-group">
                <input class="form-control input-sm" type="text" placeholder=".input-sm">
            </div>
            <div class="form-group">
            </div>
            <div class="form-group">
                <select class="form-control input-lg">
                    <option value="">.input-lg</option>
                </select>
            </div>
            <div class="form-group">
                <select class="form-control">
                    <option value="">默认选择</option>
                </select>
            </div>
            <div class="form-group">
                <select class="form-control input-sm">
                    <option value="">.input-sm</option>
                </select>
            </div>

            <div class="row">
                <div class="col-lg-2">
                    <input type="text" class="form-control" placeholder=".col-lg-2">
                </div>
                <div class="col-lg-3">
                    <input type="text" class="form-control" placeholder=".col-lg-3">
                </div>
                <div class="col-lg-4">
                    <input type="text" class="form-control" placeholder=".col-lg-4">
                </div>
            </div>
        </form>

    </body>
</html>