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Javascript Object - prototype
Description:
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.
Syntax:
object.prototype.name = value
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Example:
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>
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This will produce following result:
Book title is : Perl
Book author is : Mohtashim
Book price is : 100
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To understand it in better way you can Try it yourself.
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