gistfile1.js

Class('MyParenClass')({
    prototype : {
        init : function (options){
            this.myName = 'minombre'
            return this;
        }
    }
});

Class('MyChildrenClass').inherits(MyParenClass)({
    prototype : {
        init : function(){
            console.log('this will fail', this.name);
            this.constructor.init.call(this);
            console.log('this is ok', this.name);
        }
    }
});

var myInstance = new MyChildrenClass();
myInstance.name // -> 'mi nombre'