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<!DOCTYPE html> <html> <head> <style> table,th { border:1px solid black; } </style> </head> <body> <table id="myTable"> <tr id="myTr"> </tr> </table> <h3>��ʾ��δ��� TH Ԫ��</h3> <p>�����ť������ TH Ԫ�ء�</p> <button onclick="myFunction()">������һ��</button> <script> function myFunction() { var x = document.createElement("TH"); var t = document.createTextNode("�µı�ͷ"); x.appendChild(t); document.getElementById("myTr").appendChild(x); } </script> </body> </html>