class=img-rounded img-circle img-thumbnail
<img src="/wp-content/uploads/2014/06/download.png" class="img-rounded">
<img src="/wp-content/uploads/2014/06/download.png" class="img-circle">
<img src="/wp-content/uploads/2014/06/download.png" class="img-thumbnail">
<img src="cinqueterre.jpg" class="img-responsive" alt="Cinque Terre">
图片响应