<input type="button" onclick="rowRules()" value="仅显示行边框">
<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>
<td>Row2 cell1</td>
<td>Row2 cell2</td>