JavaScript NaN Property
 Complete Number Object Reference
Definition and Usage
The NaN property is a special value representing Not-a-Number. This property
is used to indicate a value is not a number. A number object may be set to this
value to indicate that it is not really a number.
Tip: Use the isNaN() global function to see if a value is an NaN
value.
Syntax
Example
<script type="text/javascript">
var Month=30;
if (Month < 1 || Month > 12)
{
Month = Number.NaN;
}
document.write(Month);
</script>
|
The output of the code above will be:
Try-It-Yourself Demos
NaN
In this example we will use NaN to indicate a value is not a number.
Complete Number Object Reference
The Altova MissionKit is a suite of intelligent XML tools, including:
XMLSpy® – industry-leading XML editor
- Support for all XML-based technologies
- Graphical editing views, powerful debuggers, code generation, & more
MapForce® – graphical data mapping tool
- Drag-and-drop data conversion with code generation
- Support for XML, DBs, EDI, Excel® 2007, text, Web services
StyleVision® – visual stylesheet designer
- Drag-and-drop stylesheet design for XML & databases
- Output to HTML, PDF, RTF, Word 2007, & more
And more…
Try before you buy with a free fully functional 30-day trial
Download today
 |
|
Get Your Diploma!
W3Schools' Online Certification Program is the perfect solution for busy
professionals who need to balance work, family, and career building.
The HTML Certificate is for developers who want to document their knowledge of HTML, XHTML, and CSS.
The JavaScript Certificate is for developers who want to document their knowledge of JavaScript and the HTML DOM.
The XML Certificate is for developers who want to document their knowledge of XML, XML DOM and XSLT.
The ASP Certificate is for developers who want to document their knowledge of ASP, SQL, and ADO.
The PHP Certificate is for developers who want to document their knowledge of PHP and SQL (MySQL).
|
|
