W3School TIY
编辑您的代码：
<!DOCTYPE html> <html> <head> <style> table,th,td { border:1px solid black; } </style> </head> <body> <h3>演示如何访问 TH 元素</h3> <table> <tr> <th id="myTh">名字</th> </tr> <tr> <td>乔布斯</td> </tr> </table> <p>点击按钮来改变 TH 元素的文本。</p> <button onclick="myFunction()">亲自试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myTh"); x.innerHTML = "新的表头"; } </script> </body> </html>
查看结果: