JS Object-oriented 5 notation

Define the Circle class, member function area () with member variable r, constant pi, and calculated areas

// The 1th kind of notation function Circle (r) {      this.r =3.14159= function () {   return  This  This . R;} var New Circle (1.0);   

 //  2nd notation   Circle = function () { var  obj = Span style= "color: #0000ff;"   >new   Object (); Obj.      PI  = 3.14159  ; Obj.area  = function (r) { return  Span style= "color: #0000ff;" >this .   PI * r * R;  return   obj;}  var  C = new   Circle (); Alert (C.area ( 1.0 )); 

 //  3rd notation   Circle = new   Object (); Circle.pi  = 3.14159  ; Circle.area  = function (r) { return this . PI * r * R;} Alert (Circle.area ( 1.0 )); 

 //  4th notation   circle={  " pi  : 3.14159  ,   area   " :function (R) { return  this .        PI * r * R; }};alert (Circle.area ( 1.0 )); 

// The 5th kind of notation var New Function ("this. PI = 3.14159;this.area = function (r) {return r*r*this. PI;} " ); alert ((new Circle ()). Area (1.0));

JS Object-oriented 5 notation