extend = function(Child, Parent)
        {
        var F = function() { };
        F.prototype = Parent.prototype;
        Child.prototype = new F();
        Child.prototype.constructor = Child;
        Child.super = Parent.prototype;
    };
>function (Child, Parent)
>        {
>        var F = function() { };
>        F.prototype = Parent.prototype;
>        Child.prototype = new F();
>        Child.prototype.constructor = Child;
>        Child.super = Parent.prototype;
>    }
function A() {  }
>undefined
A.prototype.init = function(){this.name = 'A'}
>function (){this.name = 'A'}
function B(){  }
>undefined
extend(B, A)
>undefined
count = 0;
>0
B.prototype.init = function(){ if (++count < 100) console.log('B.prototype.init.apply', this); this.constructor.super.init.apply(this,arguments); this.extra = 'im B';}
>function (){ if (++b < 100) console.log('B.prototype.init.apply', this); this.constructor.super.init.apply(this,arguments); this.extra = 'im B';}
function C() {  }
>undefined
extend(C, B)
>undefined
C.prototype.init = function(){  if (++count < 100) console.log('C.prototype.init.apply', this); this.constructor.super.init.apply(this,arguments); this.extraC = 'mimimi';}
>function (){  if (++count < 100) console.log('C.prototype.init.apply', this); this.constructor.super.init.apply(this,arguments); this.extraC = 'mimimi';}
(new C).init()
>C.prototype.init.apply
>C
>B.prototype.init.apply
>C
>B.prototype.init.apply
>C
>B.prototype.init.apply
>C
>B.prototype.init.apply
>C
>B.prototype.init.apply
>C
>B.prototype.init.apply
>C
>B.prototype.init.apply
>C
>B.prototype.init.apply
>C
...
>RangeError: Maximum call stack size exceeded
>  arguments: Array[0]
>  get message: function getter() { [native code] }
>  set message: function setter() { [native code] }
>  stack: undefined
>  type: "stack_overflow"
>    __proto__: Error