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<html>
<head>
<script type="text/javascript">
function gettip(txt)
{
document.getElementById('tip').innerHTML='W3School 提供有关 WEB 标准和脚本技术的教程'
}
</script>
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<body>
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<p>请双击 "W3School.org.cn"</p>
<table>
<tr>
<th ondblclick="gettip()" valign="top">W3School.org.cn</th>
<th id="tip"> </th>
</tr>
</table>
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</body>
</html>
​