<html>
<head>
<script type="text/javascript">
function rowRules()
{ document.getElementById('myTable').rules="rows" }
function colRules()
{document.getElementById('myTable').rules="cols" }
</script>
</head>
<body>
<table id="myTable" border="1">
<tr>
<td>Row1 cell1</td>
<td>Row1 cell2</td>
</tr>
<tr>
<td>Row2 cell1</td>
<td>Row2 cell2</td>
</tr>
<tr>
<td>Row3 cell1</td>
<td>Row3 cell2</td>
</tr>
</table>
<br />
<input type="button" onclick="rowRules()" value="仅显示行边框">
<input type="button" onclick="colRules()" value="仅显示列边框">
</body>
</html>