W3School TIY
编辑您的代码：
<html> <head> <script type="text/javascript"> function alertCaption() { alert(document.getElementById("table1").caption.innerHTML); } </script> </head> <body> <table id="table1" border="1"> <caption>This is a table caption</caption> <tr> <th>Firstname</th> <th>Lastname</th> </tr> <tr> <td>Peter</td> <td>Griffin</td> </tr> </table> <br /> <input type="button" onclick=alertCaption() value="Alert table caption" /> </body> </html>
查看结果: