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编辑您的代码：
<!DOCTYPE html> <html> <head> <style> table,th { border:1px solid black; } </style> </head> <body> <table id="myTable"> <tr id="myTr"> </tr> </table> <h3>演示如何创建 TH 元素</h3> <p>点击按钮来创建 TH 元素。</p> <button onclick="myFunction()">亲自试一试</button> <script> function myFunction() { var x = document.createElement("TH"); var t = document.createTextNode("新的表头"); x.appendChild(t); document.getElementById("myTr").appendChild(x); } </script> </body> </html>
查看结果: