javascript - "Class" constants and constructor: how to implement? -

I want to do something that is applicable in Java Please:

  var hat = New Hat (Hat.Color.RED, Hat.Size.MEDIUM);   
 How can I do this (tried to mess with the function  prototype , but with little success)?  
  Hat  will be a constructor function:  
 
  
 
 function Hat (color, size) {this .id = "X" + color + size; // or something else}   
 on the prototype  hat  are examples for "methods":  
  Hat.prototype.raise = Function () {...};   
 But the properties of the constants function object are:  
  Hat.Color = {RED: "F00", GREEN: "0F0", .. ..} ; Hat.Size = {Medium: 0, Big: 1, ...};   
 If your library correctly executes the "extension" function (nothing special on constructors), then it should also work:  
  Object.extend (hat, {color: {Red: "F00", Green: "0f0", ...}, Size: = {Medium: 0, Big: 1, ...},});