例子：首页实现显示子分类，并实现Tab页开始：

1. 打开调试开关 文件地址：include/cls_template.php 找到 ：    

 function _eval($content)

函数体第一行增加: echo($content);   改写调试完毕后在注释掉。 

2. 修改goods获取函数，以便显示子分类。   文件：include/cls_goods.php 找到函数：function assign_cat_goods,在 $cat['id']   = $cat_id; 后增加一行:

$cat['cat_id'] = get_child_tree($cat_id);

// 调用子分类信息。

3.修改模板 cat_goods.lbi ，显示子分类并调用子商品 <div class="row" style="margin-top:15px;" id="CatGoods">
  <div class="span12">
    <div class="tabbable" style="position:relative;"> 
      <!--   {if $goods_cat.cat_id}   -->   //有子分类
      <ul class="nav nav-tabs" >
        <!--    {foreach from=$goods_cat.cat_id item=rec_cat name=f}--> //显示子分类
        <li <!-- {if $smarty.foreach.f.index eq 0} -->class="active" <!--{/if}-->><a href="#tab{$rec_cat.id}" data-toggle="tab">{$rec_cat.name|escape:html}</a></li>
        <!--    {/foreach}-->
       
      </ul>
<!--      <div align="right" class="more"><a href="{$goods_cat.url}">更多>></a></div>-->
      <div class="tab-content">
      <!--   {foreach from=$goods_cat.cat_id item=rec_cat1 name=f1}-->//这里循环获取当前商品分类ID，传入获取商品信息集合
       <?php 
               $cid = $this->_var['rec_cat1']['id'];
            $this ->assign('goods_cat_'.$cid, assign_cat_goods($cid, 4));
            $this->assign('cat_goods_nf',$this->_var['cat_goods_'.$cid]);
     ?>
        <div class="tab-pane <!-- {if $smarty.foreach.f1.index eq 0} -->active<!--{/if}-->" id="tab{$rec_cat1.id}">
          <div class="row">
            <!--{foreach from=$cat_goods_nf item=goods}--> //显示商品
            <div class="span3">
              <div class="thumbnail"> <a href="{$goods.url}"><img src="{$goods.thumb}" alt="{$goods.name|escape:html}"></a>
                <div class="thumspan">{$goods.short_name|escape:html}<br />
                市场价：<span style="color:#C30"> <b>{$goods.market_price}</b></span></div>
              </div>
            </div>
            <!--{/foreach}-->       
          </div>
        </div>
        <!--    {/foreach}-->    
      </div>
      <!--    {else}  --> //单个分类，无下级分类
      <ul class="nav nav-tabs" >
        <li class="active"><a href="#tab{$goods_cat.id}" data-toggle="tab">{$goods_cat.name|escape:html}</a></li>
      </ul>
      <div align="right" class="more"><a href="{$goods_cat.url}">更多>></a></div>
      <div class="tab-content">
        <div class="tab-pane active" id="tab{$goods_cat.id}">
          <div class="row">
            <!--{foreach from=$cat_goods item=goods}-->
            <div class="span3">
              <div class="thumbnail"> <a href="{$goods.url}"><img src="{$goods.thumb}" alt="{$goods.name|escape:html}"></a>
                <div class="thumspan">{$goods.short_name|escape:html}<br />
                  市场价：<span style="color:#C30"> <b>{$goods.market_price}</b></span></div>
              </div>
            </div>
            <!--{/foreach}-->
           
          </div>
        </div>
      </div>
      <!--        {/if}    -->
     
    </div>
  </div>
</div>
<script type="text/javascript">divheight("CatGoods");</script> 效果如下：