rowSpan 属性可设置或返回表元横跨的行数。
tabledataObject.rowSpan=number_of_rows
下面的例子更改了表元横跨的行数:
<html>
<head>
<script type="text/javascript">
function changeRowSpan()
{
document.getElementById("td2").rowSpan="2";
}
</script>
</head>
<body>
<table border="1">
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>
<tr>
<td id="td1">Peter</td>
<td id="td2">Griffin</td>
</tr>
<tr>
<td id="td3">Harry</td>
<td id="td4">Potter</td>
</tr>
</table>
<br />
<input type="button" onclick=changeRowSpan()
value="Change rowspan" />
</body>
</html>