<button class="btn btn-default"> <span class="glyphicon glyphicon-chevron-up"></span>按钮 </button>
警告框
<div class="alert alert-danger" role="alert"> <span class="glyphicon glyphicon-warning-sign"></span> 危险 </div>
<button class="btn btn-default"> <span class="glyphicon glyphicon-chevron-up"></span>按钮 </button>
警告框
<div class="alert alert-danger" role="alert"> <span class="glyphicon glyphicon-warning-sign"></span> 危险 </div>