51help TIY
码：
<html> <head> <script type="text/javascript"> function topAlign() { document.getElementById('td1').vAlign="top"; document.getElementById('td2').vAlign="top"; document.getElementById('td3').vAlign="top"; } </script> </head> <body> <table width="50%" border="1"> <tr> <th>名</th> <th>姓</th> <th>文本</th> </tr> <tr> <td id="td1">John</td> <td id="td2">Adams</td> <td id="td3">是名字是 John Adams。 </td> </tr> </table> <br /> <input type="button" onclick="topAlign()" value="单元" /> </body> </html>
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