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JavaScript Number() Function
JavaScript Global Functions
Definition and Usage
The Number() function converts the object argument to a number that represents the object's value.
If the value cannot be converted to a legal number, NaN is returned.
Syntax
Number(object)
| Parameter | Description |
|---|---|
| object | Optional. A JavaScript object. If no argument is provided, it returns 0. |
Browser Support
The Number() function is supported in all major browsers.
Tips and Notes
Note: If the parameter is a Date object, the Number() function returns the number of milliseconds since midnight January 1, 1970 UTC.
Example
Example
Convert different object values to their numbers:
<script type="text/javascript">
var test1= new Boolean(true);
var test2= new Boolean(false);
var test3= new Date();
var test4= new String("999");
var test5= new String("999 888");
document.write(Number(test1)+ "<br />");
document.write(Number(test2)+ "<br />");
document.write(Number(test3)+ "<br />");
document.write(Number(test4)+ "<br />");
document.write(Number(test5)+ "<br />");
</script>
var test1= new Boolean(true);
var test2= new Boolean(false);
var test3= new Date();
var test4= new String("999");
var test5= new String("999 888");
document.write(Number(test1)+ "<br />");
document.write(Number(test2)+ "<br />");
document.write(Number(test3)+ "<br />");
document.write(Number(test4)+ "<br />");
document.write(Number(test5)+ "<br />");
</script>
The output of the code above will be:
Try it yourself »
JavaScript Global Functions
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Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.