From http://www.w3schools.com (Copyright Refsnes Data)

JavaScript prototype Property

String Object Reference JavaScript String Object

Definition and Usage

The prototype property allows you to add properties and methods to an object.

Syntax

object.prototype.name=value

Example

Example

Add a property to an object:

<script type="text/javascript">

function employee(name,jobtitle,born)
{
this.name=name;
this.jobtitle=jobtitle;
this.born=born;
}

var fred=new employee("Fred Flintstone","Caveman",1970):
employee.prototype.salary=null;
fred.salary=20000;

document.write(fred.salary);

</script>

The output of the code above will be:

20000

Try it yourself »

String Object Reference JavaScript String Object

From http://www.w3schools.com (Copyright Refsnes Data)