The prototype property can add properties and methods to any object (Number, Boolean, String, Date, etc.).
Note: Prototype is a global property that can be used in almost all objects.
grammar
= value
Example:
Here is an example showing how to add properties to an object using the properties of a prototype attribute:
<html>
<head>
<title>User-defined objects</title>
<script type="text/javascript">
function book(title, author){
= title;
= author;
}
</script>
</head>
<body>
<script type="text/javascript">
var myBook = new book("Perl", "Mohtashim");
= null;
= 100;
("Book title is : " + + "<br>");
("Book author is : " + + "<br>");
("Book price is : " + + "<br>");
</script>
</body>
</html>
This will produce the following results:
Book title is : Perl Book author is : Mohtashim Book price is : 100