<div class="row"> <div class="col-xs-1 center-block"> <span>aaaaaaaaaaaaaaaaaaaaaaaaaaa</span> </div> </div>
JSFiddle Demo
<div class="col-xs-1" align="center">
代替
<div class="col-xs-1 center-block">
你也可以使用bootstrap 3 css:
<div class="col-xs-1 text-center">
编辑:HTML5中不支持align属性