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给a标签添加类class="thumbnail"如下:
<div class="row"> <div class="col-md-3 col-sm-6"> <a href="#" class="thumbnail"><img src="img/01.png" alt="图片"></a> </div> <div class="col-md-3 col-sm-6"> <a href="#" class="thumbnail"><img src="img/01.png" alt="图片"></a> </div> <div class="col-md-3 col-sm-6"> <a href="#" class="thumbnail"><img src="img/01.png" alt="图片"></a> </div> <div class="col-md-3 col-sm-6"> <a href="#" class="thumbnail"><img src="img/01.png" alt="图片"></a> </div> </div>点击右上角叉号就关闭警示框。可以更改背景色alert-warning、alert-info、alert-success、alert-danger 可关闭的警示框添加类;alert-dismissible和按钮button. 也可以在警告框中添加a链接:<p>这里是提示信息<a href="#" class="alert-link">百度</a></p>
<div class="alert alert-warning alert-dismissible"> <button type="button" class="close" data-dismiss="alert">×</button> <p>这里是提示信息</p> </div>