fmpq.com
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> <script> function displayResult(){ document.getElementById("myHeader1").colSpan="2"; } </script> </head> <body> <table border="1"> <tr> <th id="myHeader1">月份</th> <th id="myHeader2">存款</th> </tr> <tr> <td>January</td> <td>$100.00</td> </tr> <tr> <td>February</td> <td>$10.00</td> </tr> <tr> <td>March</td> <td>$80.00</td> </tr> </table> <br> <button type="button" onclick="displayResult()">改变第一个单元格的横跨列数</button> </body> </html>
运行结果