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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>
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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