text: 
  function C(v) {
      this.x = v;
  }
  C.prototype = { x : 3, m : function(){ return this.x; } };
  
  var c = new C(19);
  var s = C.prototype.m().toString()
  console.log(s);
  s = c.m().toString()
  console.log(s);
  