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The prototype property allows you to add properties and methods to any object (Number, Boolean, String and Date etc).
Note: Prototype is a global property which is available with almost all the objects.
object.prototype.name = value |
Here is an example showing how to use the prototype property to add a property to an object:
<html> <head> <title>User-defined objects</title> <script type="text/javascript"> function book(title, author){ this.title = title; this.author = author; } </script> </head> <body> <script type="text/javascript"> var myBook = new book("Perl", "Mohtashim"); book.prototype.price = null; myBook.price = 100; document.write("Book title is : " + myBook.title + "<br>"); document.write("Book author is : " + myBook.author + "<br>"); document.write("Book price is : " + myBook.price + "<br>"); </script> </body> </html> |
This will produce following result:
Book title is : Perl Book author is : Mohtashim Book price is : 100 |
To understand it in better way you can Try it yourself.
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