JS & DOM Reference
OverviewJavaScript Objects
JS Array JS Boolean JS Date JS Math JS Number JS String JS RegExp JS GlobalBrowser Objects
Window Navigator Screen History LocationCore DOM Objects
DOM Node DOM NodeList DOM NamedNodeMap DOM Document DOM Element DOM AttrHTML DOM Objects
DOM Document DOM Events DOM ElementsDOM Anchor DOM Area DOM Base DOM Body DOM Button DOM Form DOM Frame/IFrame DOM Frameset DOM Image DOM Input Button DOM Input Checkbox DOM Input File DOM Input Hidden DOM Input Password DOM Input Radio DOM Input Reset DOM Input Submit DOM Input Text DOM Link DOM Meta DOM Object DOM Option DOM Select DOM Style DOM Table DOM td / th DOM tr DOM Textarea
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
isFinite(value)
| 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>
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>
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
true
true
true
false
false
Try it yourself »
JavaScript Global Functions
Your suggestion:
Close [X]
Thank You For Helping Us!
Your message has been sent to W3Schools.
Close [X]
WEB BUILDING
XML Editor - Free Trial! FREE Website BUILDER FREE Website Creator Best Website Templates
