JavaScript isFinite() Function
 JavaScript Global Functions
Definition and Usage
The isFinite() function determines whether a number is a finite, legal
number.
Tip: This function returns false if the value is +infinity, -infinity,
or NaN.
Syntax
| Parameter |
Description |
| value |
Required. The value to be tested |
Browser Support
The isFinite() function is supported in all major browsers.
Example
Example
Check whether a number is a finite, legal number:
<script type="text/javascript">
document.write(isFinite(123)+ "<br />");
document.write(isFinite(-1.23)+ "<br />");
document.write(isFinite(5-2)+ "<br />");
document.write(isFinite(0)+ "<br />");
document.write(isFinite("Hello")+ "<br />");
document.write(isFinite("2005/12/12")+ "<br />");
</script>
|
The output of the code above will be:
true
true
true
true
false
false
|
Try it yourself »
|
JavaScript Global Functions
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