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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>runoops基础编程教程(runoops.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: