Javascript Prototype Property

The string object of javascript allows you to manipulate a stored piece of text.

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

The javascript code example below shows you how to use the prototype property to add a method to an object.

The javascript code below outputs an alert box with the text "John Smith".

<script type="text/javascript" language="javascript">

function Name(first, last)
{
this.first = first;
this.last = last;
}

var person = new Name("John", "Smith");

Name.prototype.toString = function()
{
return this.first + " " + this.last;
}

alert( person );

</script>