JavaScript NaN Property
 JavaScript Global Functions
Definition and Usage
The NaN property represents "Not-a-Number" value. This property indicates that a value is not a legal number.
Tip: Use the isNaN() global function to see if a value is a NaN value.
Syntax
Browser Support
The NaN property is supported in all major browsers.
Example
Example
Here, the variable "Month" is assigned NaN if it is smaller than 1, or greater than 12:
<script type="text/javascript">
var Month=13;
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 Global Functions
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