gistfile1.js

var ComponentA = Component.extend({
    param1: 'aaa',
    f1: function(){
      console.log(this.param1);
    }
  }), ComponentB = ComponentA.extend({
    param1: 'bbb',
    param2: 'bbbb',
    f2: function(){
      this.f1();
      console.log(this.param2);
    }
  }), ComponentC = ComponentB.extend({
    param2: 'cccc',
    param3: 'ccccc',
    f1: function(){
      this.__PARENT__.f1();
      this.f3();
    },
    f3: function(){
      console.log(this.param3);
    }
  }),
    objectA = new ComponentA,
    objectB = new ComponentB,
    objectC = new ComponentC;
console.log(objetcA, objectB, objectC);

objectA.f1(); // aaa
objectB.f2(); // bbb bbbb
objectC.f2(); // bbb ccccc cccc