Javascript Object

An object is an entity having state and behavior. JavaScript is an object oriented scripting language. JavaScript is template based not class based but we can create object directly.

Syntax to add property to add object

objectName.objectProperty = propertyValue;

We use the write() method to document objects to write any content on the document.

Document.write("Hello world")

Example

The following example shows how to create an Object.

<!DOCTYPE html>  
<html>  
<head>  
<title>User-defined objects</title>  
<script type="text/javascript">  
var book = new Object();   // Object created  
book.subject = "5 points someone"; // Properties assign to the object  
book.author  = "ChetanBhagat";  
</script>  
</head>  
<body>  
<script type="text/javascript">  
document.write("Book Name is : " + book.subject + "<br>");  
document.write("Book Author is : " + book.author + "<br>");  
</script>  
</body>  
</html>

Try Now

Output

Book Name is: 5 points someone
Book Author is: Chetan Bhagat

Methods of an Object

Example

<!DOCTYPE html>  
<html>  
<head>  
<title>User-defined objects</title>  
<script type="text/javascript">// Define a function which will work as a method  
function addPrice(amount){  
this.price = amount;   
}  
function book(title, author){  
this.itle = title;  
this.author  = author;  
this.addPrice = addPrice; // Assign that method as property.  
}  
</script>  
</head>  
<body>  
<script type="text/javascript">  
varmyBook = new book("5 Points Someone", "ChetanBhagat");  
myBook.addPrice(150);  
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>

Try Now

Output

Book Title is: 5 Points Someone
Book Author is :ChetanBhagat
Book Price is : 150



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