<!-- 同一类上一篇和下一篇 -->
<div> 
<div style="float:left; text-align:left; margin-right:10px;"><?php previous_post_link('上一篇： %link' ,' %title' , true) ?></div>
<div style="float:right; text-align:right; margin-left:10px; "><?php next_post_link('下一篇： %link »','%title' , true) ?></div> 
</div>