solution

count = 0
>0
B.prototype.init = function(){ if (++count < 100) console.log('B.prototype.init.apply', this);

if (arguments.callee === this.constructor.super.init) {  console.log('stop!!!'); return;  }
this.constructor.super.init.apply(this,arguments);

this.extra = 'im B';



}
>function (){ if (++count < 100) console.log('B.prototype.init.apply', this);
>
>if (arguments.callee === this.constructor.super.init) {  console.log('stop!!!'); return;  }
>this.constructor.super.init.apply(this,arguments);
>
>this.extra = 'im B';
>
>
>
>}
(new C).init();
>C.prototype.init.apply
>C
>B.prototype.init.apply
>C
>stop!!!