Number.NaN
JavaScript 1.1+, ECMAScript 1.0+, JScript 1.0+ Nav3+, NES2+, IE 3+, Opera3+ Syntax
Number.NaNDescription
The NaN property of the Number object represents a value that is not equal to any numeric value.
Example
Listing 6.184 shows how to use the NaN property. An integer constant, 123, is compared to the NaN constant to see if it is a numeric value or not.
Listing 6.184 Example of NaN Property
<html>
<body>
<script language="JavaScript">
<!–– Hide
// checks to see if 123 is a number or not
if(123 == Number.NaN){
document.write("This is not a number");
}
// End Hide ––>
</script>
</body>
</html>
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