fmpq.com
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <p id="demo"></p> <script> var length; length = 6; document.getElementById("demo").innerHTML = length; </script> </body> </html>
运行结果