<div class="ui-grid-a">
    <div class="ui-block-a"><a href="#"  data-role="button">确定</a></div>
    <div class="ui-block-b"><a href="#"  data-role="button">取消</a></div>
</div>
 
class: ui-grid-a ---two columns
         ui-grid-b ---three columns
         ui-grid-c ---four columns
         ...