How to use isNaN in JavaScript
This article describe about isNaN() Function in JavaScript.
isNaN() Function in JavaScript
It is define whether a value is an illegal number ( means not a number).
Note: isNaN() function returns true if the value is NaN, otherwise false.
Syntax
| Parameter |
Description |
| value |
Required. to be tested. |
Example
|
<!DOCTYPE html>
<html>
<body>
<script type="text/javascript">
document.write(isNaN(520) + "<br />");
document.write(isNaN(-5.20) + "<br />");
document.write(isNaN(15-5) + "<br />");
document.write(isNaN(0) + "<br />");
document.write(isNaN("Hello world") + "<br />");
document.write(isNaN("2012/08/06") + "<br />");
</script>
</body>
</html>
|
Output
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