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源代码：
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<!DOCTYPE html> <html> <head> <script> function rows() { document.getElementById('myTable').rules="rows"; } function cols() { document.getElementById('myTable').rules="cols"; } </script> </head> <body> <table id="myTable"> <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="rows()">Show only row borders</button> <button type="button" onclick="cols()">Show only col borders</button> <p><b>Note:</b> The rules property is not displayed properly in Internet Explorer prior version 9.</p> </body> </html>
运行结果
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