Number functions

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Number Methods</h2>

<p>The isNan() method returns true if the argument is NaN. Otherwise it returns false.</p>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML =
isNaN("Hello") + "<br>" + isNaN("10");
</script>

</body>
</html>

JavaScript Number Methods

The isNan() method returns true if the argument is NaN. Otherwise it returns false.