下面的例子设置了表格的两种不同的内部边线 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function rows() {
      document.getElementById('myTable').rules = "rows";
    }

    function cols() {
      document.getElementById('myTable').rules = "cols";
    }
  </script>
</head>
<body>

  <table id="myTable">
    <tr>
      <td>cell 1</td>
      <td>cell 2</td>
    </tr>
    <tr>
      <td>cell 3</td>
      <td>cell 4</td>
    </tr>
  </table>
  <br>
  <button type="button" onclick="rows()">只显示行边界</button>
  <button type="button" onclick="cols()">只显示列边界</button>
  <p><b>注意:</b> rules属性在Internet Explorer 9之前版本不能正常显示。</p>

</body>
</html>
        