合并单元 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function setColSpan() {
      var x = document.getElementById('myTable').rows[0].cells;
      x[0].colSpan = "2";
      x[1].colSpan = "6";
    }
  </script>
</head>
<body>

  <table id="myTable" border="1">
    <tr>
      <td colspan="4">单元格 1</td>
      <td colspan="4">单元格 2</td>
    </tr>
    <tr>
      <td>单元格 3</td>
      <td>单元格 4</td>
      <td>单元格 5</td>
      <td>单元格 6</td>
      <td>单元格 7</td>
      <td>单元格 8</td>
      <td>单元格 9</td>
      <td>单元格 10</td>
    </tr>
  </table>
  <form>
    <input type="button" onclick="setColSpan()" value="修改合并列">
  </form>

</body>
</html>
        