求助，关于table表格问题。

为什么th就一块没有铺开呢

 <div class="table-responsive">
                  <table id="sample-table-1" class="table table-striped table-bordered table-hover">
                  <thead>
            <th>印刷品类型</th>
         
           </thead>    
            
             <tbody>  

               <tr>
            <td><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printDestroy&amp;book_company_id=501" target="_blank">残次品销毁列表</a></td>
                     
            

            <td><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printKeeping&amp;book_company_id=501" target="_blank">印刷品保管列表</a></td>
           

            <td><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printPay&amp;book_company_id=501" target="_blank">印刷品交付列表</a></td>
           

            <td><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printVerify&amp;book_company_id=501&amp;type_id=1" target="_blank">承印、验证列表</a></td>
           

                      <td><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printVerify&amp;book_company_id=501&amp;type_id=2" target="_blank">承印登记列表</a></td>
           
                </tr>

                  </tbody>
              </table>   
</div>

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<th colspan="5">

http://www.w3school.com.cn/tags/att_th_colspan.asp

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你是不是想要这种？

<div class="table-responsive">
    <table id="sample-table-1" class="table table-striped table-bordered table-hover">
        <thead>
            <th>印刷品类型</th>
            <th><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printhestroy&amp;book_company_id=501" target="_blank">残次品销毁列表</a></th>
            <th><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printKeeping&amp;book_company_id=501" target="_blank">印刷品保管列表</a></th>
            <th><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printPay&amp;book_company_id=501" target="_blank">印刷品交付列表</a></th>
            <th><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printVerify&amp;book_company_id=501&amp;type_id=1" target="_blank">承印、验证列表</a></th>
            <th><a href="http://www.zhifayun.cn/index.php?app=memberAdmin&amp;mod=PrintBook&amp;act=printVerify&amp;book_company_id=501&amp;type_id=2" target="_blank">承印登记列表</a></th>
        </thead>
        <tbody>
        </tbody>
    </table>
</div>