OOPS Concept in Javascript

Here is the sample code to show oops concept in javascript.

<script type="text/javascript" >
  //Declare Class
    function myClass() {
        //Member Variable
        this.memberVariable = '';
        //Method
        this.methodTest = function(obj) {
            alert(this.memberVariable + ' ' + obj);
        }
    }
    //Extend Class
    myClass.prototype.newMethodTest = function(obj) {
    
        alert(this.memberVariable + ' ' + obj);
    }
    //Static Method
    myClass.myStaticMethod = function(obj) {
        alert('This is static method with arg '+ obj);
    }

    //derived Class
    derivedClass.prototype = new myClass(); 
    function derivedClass() {
        //New member variable
        this.newMemberVariable = '';
        //Override New method
        this.newMethodTest = function() {
            alert('old value' + this.memberVariable + 'new value' + this.newMemberVariable);
        }
     }
    
     

 
    var obj = new derivedClass();
    obj.newMemberVariable = 'New Test';
    obj.memberVariable = 'Old Test';
    obj.newMethodTest();
    obj.methodTest('arg'); 
  

   

</script>