​x
 
<html>
<head>
<script type="text/javascript">
function alignCell()
{
document.getElementById('td1').align="right"
}
</script>
</head>
<body>
​
<table border="1">
<tr>
<th>-----名-----</th>
<th>-----姓-----</th>
</tr>
<tr>
<td id="td1">John</td>
<td>Adams</td>
</tr>
</table>
​
<form>
<input type="button" onclick="alignCell()" 
value="对齐 'John' 单元格" />
</form>
​
</body>
</html>
​
​
​