■スクリプト
<HTML> <HEAD> <TITLE>Sample</TITLE> </HEAD> <BODY bgColor="white"> <CENTER> <H1>数値かどうか調べます</H1> </CENTER> <TABLE BORDER="1"> <SCRIPT Language="JavaScript"> <!-- myValue = 28; myString = "OpenSpace"; myNum = "34.56"; alert("isNaN(28)", isNaN(myValue)); alert("isNaN('OpenSpace')",isNaN(myString)); alert("isNaN('34.56')", isNaN(myNum)); // --> </SCRIPT> </TABLE> </BODY></HTML>