哇 有难度哦   里面的值一样很难判断的啊

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      <title>合并表格</title>
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      function marage(){
      var trObjs=document.getElementsByTagName("tr");
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      </head>   
        
      <body>   
      <table width="582" border="1">
      <tr>
        <td width="49">test01</td>
        <td width="39">test11</td>
        <td width="53">test12</td>
        <td width="53" rowspan="3">a</td>
        <td colspan="6">b</td>
      </tr>
      <tr>
        <td>test10</td>
        <td>test12</td>
        <td>test13</td>
        <td colspan="3"> </td>
        <td width="53" rowspan="2">2</td>
        <td width="53" rowspan="2">4</td>
        <td width="59" rowspan="2">5</td>
      </tr>
      <tr>
        <td>test20</td>
        <td>test21</td>
        <td>test23</td>
        <td width="53">1</td>
        <td width="53">2</td>
        <td width="53">3</td>
      </tr>
      <tr>
        <td rowspan="12"><span class="STYLE1">资产相关费<br />
        用</span></td>
        <td rowspan="2"><span class="STYLE1">折旧</span></td>
        <td><span class="STYLE1">1</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">2</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td rowspan="2"><span class="STYLE1">维修</span></td>
        <td><span class="STYLE1">1</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">2</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td rowspan="2"><span class="STYLE1">低值易耗品</span></td>
        <td><span class="STYLE1">1</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">2</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">物业费</span></td>
        <td><span class="STYLE1">物业费</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">车辆费用</span></td>
        <td><span class="STYLE1">车辆费用</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">水电能源费</span></td>
        <td><span class="STYLE1">水电能源费</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">保险费</span></td>
        <td><span class="STYLE1">保险费</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">其他</span></td>
        <td><span class="STYLE1">其他</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">小计</span></td>
        <td><span class="STYLE1">小计</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">合计</span></td>
        <td><span class="STYLE1">合计</span></td>
        <td><span class="STYLE1">合计</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">a</span></td>
        <td><span class="STYLE1">b</span></td>
        <td><span class="STYLE1">c</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
      <tr>
        <td><span class="STYLE1">费用</span></td>
        <td><span class="STYLE1">出差费</span></td>
        <td><span class="STYLE1">出差费</span></td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
        <td> </td>
      </tr>
    </table>
      
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