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<!DOCTYPE html> <html> <head> <!-- www.techstrikers.com --> <title>My first Javascript code</title> </head> <body bgcolor="#bnde45"> <fieldset> <legend>Javascript isNaN Function</legend> <script> document.write(isNaN(0)); document.write("</br>"); document.write(isNaN("isNan")); document.write("</br>"); document.write(isNaN(-1.891)); document.write("</br>"); document.write(isNaN("12")); document.write("</br>"); document.write(isNaN("2015/4/8")); </script> </fieldset> </body> </html>