在线运行代码 - 代码学院 www.codexy.cn

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>代码学院(codexy.cn)</title>
<script>
function above(){
	document.getElementById('myTable').frame="above";
}
function below(){
	document.getElementById('myTable').frame="below";
}
</script>
</head>
<body>

<table id="myTable" border="1">
    <tr>
		<td>cell 1</td>
		<td>cell 2</td>
    </tr>
    <tr>
		<td>cell 3</td>
		<td>cell 4</td>
    </tr>
</table>
<br>
<button type="button" onclick="above()">显示上面的边框</button>
<button type="button" onclick="below()">显示底部边框</button>
<p><b>Note:</b>frame属性在Internet Explorer 9之前版本不能正常显示。</p>

</body>
</html>
源代码

动行结果
