例子：
<?php
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script>
function modifyTableContent()
{
var obj = document.getElementById("tab1");
obj.rows[1].cells[1].innerHTML = "zhuhai"; // 修改了第二行、第二列的内容
}
</script>
</head> <body>
<table id="tab1" width="445" border="1">
<tr>
<th width="68" scope="col">编号</th>
<th width="42" scope="col">姓名</th>
<th width="67" scope="col">登录名</th>
<th width="49" scope="col">身份</th>
<th width="85" scope="col">创建时间</th>
<th width="94" scope="col">登录时间</th>
</tr>
<tr>
<th width="68" scope="col">23</th>
<th width="42" scope="col">Jack</th>
<th width="67" scope="col">xman</th>
<th width="49" scope="col">马甲</th>
<th width="85" scope="col">09-11</th>
<th width="94" scope="col">09-13</th>
</tr>
</table>
<button style="width: 60px; height:30px" onclick="modifyTableContent()"></button>
</body>
</html>