JavaScript NaN Property
 JavaScript Number Object
Definition and Usage
The NaN property is a special value representing Not-a-Number. This property is used to indicate a value is not a number. A number object may be set to this
value to indicate that it is not really a number.
Tip: Use the isNaN() global function to see if a value is an NaN value.
Syntax
Example
Example
Use NaN to indicate that a value is not a number:
<script type="text/javascript">
var Month=30;
if (Month < 1 || Month > 12)
{
Month = Number.NaN;
}
document.write(Month);
</script>
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The output of the code above will be:
Try it yourself »
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JavaScript Number Object
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