core_js_18.js

var Test = function() {
     this.print= function() {
          this.constructor.show();
     };
};

Test.show = function() {
     alert("Test.show");
};

var t1 = new Test();
var t2 = new Test();
console.log(t1.constructor === t2.constructor);

var ct1 = new t1.constructor();
var ct2 = new t2.constructor();
ct1.print();
ct2.print();