bootstrap-巨幕、缩略图、警告框

<div class="jumbotron">
    <div class="container">
        <h1>W3School</h1>
        <p>好好学习好好学习天天向上好好学习天天向上好好学习天天向上</p>
        <p><a href="#" class="btn btn-primary">确定</a></p>
    </div>
</div>

<!-- 
    thumbnail            缩略图
-->
<div class="container">
    <div class="row">
        <div class="col-lg-2">
            <a href="www.baidu.com" class="thumbnail">
                <img src="user_photo.png" />
            </a>
        </div>
        <div class="col-lg-2">
            <a href="www.baidu.com" class="thumbnail">
                <img src="user_photo.png" />
            </a>
        </div>
    </div>

    <!--还可以把thumbnail给父级会有不同的样式 -->
    <div class="row" style="margin-top:20px">
        <div class="col-lg-4">
            <div class="thumbnail">
                <a href="#">
                    <img src="user_photo.png" />
                </a>
                <div class="caption">    
                    <h3>W3School</h3>
                    <p>各种知识点在这里找得到</p>
                    <p>
                        <a href="#" class="btn btn-primary">查看</a>
                        <a href="#" class="btn btn-danger">删除</a>
                    </p>
                </div>    
            </div>    
        </div>
    </div>
</div>

<div class="container">
    <div class="row">
        <p class="alert alert-success">这是一个警告框！
            <button class="close" data-dismiss="alert">&times</button>
        </p>
        <p class="alert alert-info">这是一个警告框！</p>
        <p class="alert alert-danger">出错！</p>
        <p class="alert alert-warning">这是一个警告框！</p>
        <p class="alert alert-success">这是一个警告框！</p>
    </div>
</div>