W3School TIY Editor
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<!DOCTYPE html> <html> <head> <style> table, td { border: 1px solid black; } </style> </head> <body> <p>单击按钮为表格创建标题元素。</p> <table id="myTable"> <tr> <td>单元格 1</td> <td>单元格 2</td> </tr> <tr> <td>单元格 3</td> <td>单元格 4</td> </tr> </table> <br> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var table = document.getElementById("myTable").createCaption(); table.innerHTML = "<b>我的表格标题</b>"; } </script> </body> </html>