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<!DOCTYPE html> <html> <body> <table id="myTable" border="1"> <tr> <th>Month</th> <th>Savings</th> </tr> <tr> <td>January</td> <td>$100</td> </tr> <tr> <td>February</td> <td>$150</td> </tr> </table> <br> <button type="button" onclick="myFunction()">折叠边框</button> <script> function myFunction() { document.getElementById("myTable").style.borderCollapse = "collapse"; } </script> </body> </html>