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JavaScript prototype Property
JavaScript String Object
Definition and Usage
The prototype property allows you to add properties and methods to an object.
Note: Prototype is a global property which is available with almost all JavaScript objects.
Syntax
object.prototype.name=value
Browser Support
The prototype property is supported in all major browsers.
Example
Example
Use the prototype property to add a property to an object:
<script>
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>
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 »
JavaScript String Object
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