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> <script> document.write(isNaN(123)+ "<br>"); document.write(isNaN(-1.23)+ "<br>"); document.write(isNaN(5-2)+ "<br>"); document.write(isNaN(0)+ "<br>"); document.write(isNaN("Hello")+ "<br>"); document.write(isNaN("2005/12/12")+ "<br>"); </script> </body> </html>
运行结果