Objects In JavaScript
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JavaScript is not really an object oriented language, it is a prototyping language An object is a collection of properties
There are defferent way to use object in javascript .
- using object literal
- using instance of Object i.e new keyword
- using an object constructor i.e using this keyword
using object literal
Syntax :
object={method1:value1,method2:value2.....methodN:valueN}
Example :
<html>
<body>
<script>
emp={id:"A-38 ",name:"rajesh Kumar",salary:50000}
document.write(emp.id+" "+emp.name+" "+emp.salary);
</script>
</body>
</html>
Output :
A-38 rajesh Kumar 50000
using instance of Object
Here new keyword is used to create an object
Syntax :
var objectname=new Object();
Example :
<html> <body> <script> var book = new Object(); book.id = 121; book.name = "java"; book.rate = 1000; document.write(book.id+" "+book.name+" "+book.rate); </script> </body> </html>
Output :
121 java 1000
object constructor i.e using this keyword
Here, used this keyword to show the Object method .
Example :
<html>
<body>
<script>
function book(id,name,rate)
{
this.id=id;
this.name=name;
this.rate= rate;
}
b=new book (121,"core java",500);
document.write(b.id+" "+b.name+" "+b.rate);
</script>
</body>
</html>
Output :
121 core java 500
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