JavaScript Tutorial/Number Data Type/NaN
Версия от 18:52, 25 мая 2010; (обсуждение)
Number.NaN
The NaN property represents a value that is not equal to any numeric value.
<html>
<body>
<script language="JavaScript">
<!--
if(123 == Number.NaN){
document.write("This is not a number");
}
-->
</script>
</body>
</html>