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<!DOCTYPE html> <html> <head> <style> td, th { border: 1px solid black; } </style> </head> <body> <table id="myTable" style="border-collapse:collapse;"> <tr> <th>月份</th> <th>存款</th> </tr> <tr> <td>一月</td> <td>$100</td> </tr> <tr> <td>二月</td> <td>$150</td> </tr> </table> <br> <button type="button" onclick="myFunction()">返回边框折叠</button> <script> function myFunction() { alert(document.getElementById("myTable").style.borderCollapse); } </script> </body> </html>