SpiderMonkey

   1 #!/usr/bin/js
   2 function CTest(){
   3   this.counter=0;
   4 }
   5 
   6 
   7 CTest.prototype.increment=function(){
   8   this.counter++;
   9 };
  10 
  11 CTest.prototype.show=function(){
  12   putstr(this.counter);
  13   putstr("\r\n");
  14 };
  15 
  16 var c = new CTest();
  17 var d = new CTest();
  18 c.increment();
  19 c.increment();
  20 c.increment();
  21 c.show();
  22 
  23 d.increment();
  24 d.increment();
  25 d.show();