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编辑您的代码：
<html> <head> <script type="text/javascript"> function alertAxis() { alert(document.getElementById('td3').axis); } </script> </head> <body> <table border="1"> <tr> <th>Firstname</th> <th>Lastname</th> <th>City</th> </tr> <tr> <td id="td1">Harry</td> <td id="td2">Potter</td> <td id="td3" axis="location">NY</td> </tr> <tr> <td id="td4">Peter</td> <td id="td5">Griffin</td> <td id="td6" axis="location">Las Vegas</td> </tr> </table> <br /> <input type="button" onclick="alertAxis()" value="Alert axis" /> </body> </html>
查看结果: