Protype js example

 

function A()

{

    this.x = 1;

}

A.prototype.DoIt = function()    // Define Method

{

    this.x += 1;

}

function B()

{

    this.x = 1;

}

B.prototype.DoIt = function()    // Define Method

{

    this.x += 2;

}

a = new A;

b = new B;

a.DoIt();

b.DoIt();

document.write(a.x + ', ' + b.x);