缩略图（Thumbnails）

本章讨论Bootstrap缩略图。 许多网站需要一种在网格中布置图像，视频，文本等的方法，而Bootstrap可以通过缩略图轻松实现此目的。 使用Bootstrap创建缩略图 -

• 在图像周围添加一个带有.thumbnail类的<a>标签。

• 这会添加四个填充像素和一个灰色边框。

• 在悬停时，动画光晕会勾勒出图像。

以下示例演示了一个默认缩略图 -

<div class = "row">
   <div class = "col-sm-6 col-md-3">
      <a href = "#" class = "thumbnail">
         <img src = "/bootstrap/images/kittens.jpg" alt = "Generic placeholder thumbnail">
      </a>
   </div>
   <div class = "col-sm-6 col-md-3">
      <a href = "#" class = "thumbnail">
         <img src = "/bootstrap/images/kittens.jpg" alt = "Generic placeholder thumbnail">
      </a>
   </div>
   <div class = "col-sm-6 col-md-3">
      <a href = "#" class = "thumbnail">
         <img src = "/bootstrap/images/kittens.jpg" alt = "Generic placeholder thumbnail">
      </a>
   </div>
   <div class = "col-sm-6 col-md-3">
      <a href = "#" class = "thumbnail">
         <img src = "/bootstrap/images/kittens.jpg" alt = "Generic placeholder thumbnail">
      </a>
   </div>
</div>

添加自定义内容

现在我们有了一个基本的缩略图，可以将任何类型的HTML内容（如标题，段落或按钮）添加到缩略图中。 请按照以下步骤操作 -

• 将具有.thumbnail类的标记更改为“div”。

• 在div里面，你可以添加你需要的任何东西。 由于这是一个div，我们可以使用默认的基于span的命名约定来调整大小。

• 如果要对多个图像进行分组，请将它们放在无序列表中，每个列表项将浮动到左侧。

以下示例演示了这一点 -

<div class = "row">
   <div class = "col-sm-6 col-md-3">
      <div class = "thumbnail">
         <img src = "/bootstrap/images/kittens.jpg" alt = "Generic placeholder thumbnail">
      </div>
      <div class = "caption">
         <h3>Thumbnail label</h3>
         <p>Some sample text. Some sample text.</p>
         <p>
            <a href = "#" class = "btn btn-primary" role = "button">
               Button
            </a> 
            <a href = "#" class = "btn btn-default" role = "button">
               Button
            </a>
         </p>
      </div>
   </div>
   <div class = "col-sm-6 col-md-3">
      <div class = "thumbnail">
         <img src = "/bootstrap/images/kittens.jpg" alt = "Generic placeholder thumbnail">
      </div>
      <div class = "caption">
         <h3>Thumbnail label</h3>
         <p>Some sample text. Some sample text.</p>
         <p>
            <a href = "#" class = "btn btn-primary" role = "button">
               Button
            </a> 
            <a href = "#" class = "btn btn-default" role = "button">
               Button
            </a>
         </p>
      </div>
   </div>
   <div class = "col-sm-6 col-md-3">
      <div class = "thumbnail">
         <img src = "/bootstrap/images/kittens.jpg" alt = "Generic placeholder thumbnail">
      </div>
      <div class = "caption">
         <h3>Thumbnail label</h3>
         <p>Some sample text. Some sample text.</p>
         <p>
            <a href = "#" class = "btn btn-primary" role = "button">
               Button
            </a> 
            <a href = "#" class = "btn btn-default" role =" button">
               Button
            </a>
         </p>
      </div>
   </div>
   <div class = "col-sm-6 col-md-3">
      <div class = "thumbnail">
         <img src = "/bootstrap/images/kittens.jpg" alt = "Generic placeholder thumbnail">
      </div>
      <div class = "caption">
         <h3>Thumbnail label</h3>
         <p>Some sample text. Some sample text.</p>
         <p>
            <a href = "#" class = "btn btn-primary" role = "button">
               Button
            </a> 
            <a href = "#" class = "btn btn-default" role = "button">
               Button
            </a>
         </p>
      </div>
   </div>
</div>