Declare jsface classes.js

var A = B = C = null;

jsface.def({
cls: 'A',
as: function(){
    return {
        A: function(){
            console.log('A > constructor');
        },
        hello: function(){
            console.log('A > hello');
        }
    }
}});

jsface.def({
cls: 'B',
under: A,
as: function(){
    return {
        B: function(){
            console.log('B > constructor');
            A.call(this);
        },
        hello: function(){
            console.log('B > hello');
            A.prototype.hello.call(this);
        }
    }
}});

jsface.def({
cls: 'C',
under: B,
as: function(){
    return {
        C: function(){
            console.log('C > constructor');
            B.call(this);
        },
        hello: function(){
            console.log('C > hello');
            B.prototype.hello.call(this);
        }
    }
}});

new A().hello();
console.log('------');
new B().hello();
console.log('------');
new C().hello();

* * *

OUTPUT:

A > constructor
A > hello
------
B > constructor
A > constructor
B > hello
A > hello
------
C > constructor
B > constructor
A > constructor
C > hello
B > hello
A > hello