《javascript权威指南》第9章 例9-8源码

 //创建一个新的枚举类型
 //不能使用它来创建该类型的新实例
 function Enumeration(nameToValues){
     var Enumeration = function(){throw "Can't Instantiate Enumerations";};

     var proto = Enumeration.prototype = {
         constructor: Enumeration,
         toString: function(){return this.name;},
         valueOf: function(){return this.value;},
         toJSON: function(){return this.name;}
     };

     Enumeration.values = [];

     for(name in nameToValues){
         var e = Object.create(proto);
         e.name = name;
         e.value = nameToValues[name];
         Enumeration[name] = e;
         Enumeration.values.push(e);
     }

     Enumeration.foreach = function(f, c){
         for(var i = 0; i < this.values.length; i++) f.call(c, this.values[i]);
     };

     return Enumeration;
 }

 function Card(suit, rank){
     this.suit = suit;
     this.rank = rank;
 }

 Card.Suit = Enumeration({Clubs:1, Diamonds:2, Hearts:3, Spades: 4});
 Card.Rank = Enumeration({Two:2,Three:3,Four:4,Five:5,Six:6,
                          Seven:7,Eight:8,Nine:9,Ten:10,
                          Jack:11,Queen:12,King:13,Ace:14});

 Card.prototype.toString = function(){
         return this.rank.toString() + " of " + this.suit.toString();
 };

 Card.prototype.compareTo = function(that){
         if(this.rank < that.rank) return -1;
         if(this.rank > that.rank) return 1;
         return 0;
 };

 Card.orderBySuit = function(a, b){
     if(a.suit < b.suit) return -1;
     if(a.suit > b.suit) return 1;
     if(a.rank < b.rank) return -1;
     if(a.rank > b.rank) return 1;
     return 0;
 }

 function Deck(){
     var cards = this.cards = [];
     Card.Suit.foreach(function(s){
                         Card.Rank.foreach(function(r){
                                              cards.push(new Card(s, r));
                                          });
                      });
 }

 Deck.prototype.shuffle = function(){
     var deck = this.cards, len = deck.length;
     for(var i = len - 1; i > 0; i--){
         var r = Math.floor(Math.random() * (i + 1)),
             temp;
         temp = deck[i], deck[i] = deck[r], deck[r] = temp;
     }

     return this;
 }

 Deck.prototype.deal = function(n){
     if(this.cards.length < n) throw "Out of cards";
     return this.cards.splice(this.cards.length - n, n);
 }

 var deck = (new Deck()).shuffle();
 var hand = deck.deal(13).sort(Card.orderBySuit);

 console.log(hand);