1 //创建一个新的枚举类型
2 //不能使用它来创建该类型的新实例
3 function Enumeration(nameToValues){
4 var Enumeration = function(){throw "Can't Instantiate Enumerations";};
5
6 var proto = Enumeration.prototype = {
7 constructor: Enumeration,
8 toString: function(){return this.name;},
9 valueOf: function(){return this.value;},
10 toJSON: function(){return this.name;}
11 };
12
13 Enumeration.values = [];
14
15 for(name in nameToValues){
16 var e = Object.create(proto);
17 e.name = name;
18 e.value = nameToValues[name];
19 Enumeration[name] = e;
20 Enumeration.values.push(e);
21 }
22
23 Enumeration.foreach = function(f, c){
24 for(var i = 0; i < this.values.length; i++) f.call(c, this.values[i]);
25 };
26
27 return Enumeration;
28 }
29
30 function Card(suit, rank){
31 this.suit = suit;
32 this.rank = rank;
33 }
34
35 Card.Suit = Enumeration({Clubs:1, Diamonds:2, Hearts:3, Spades: 4});
36 Card.Rank = Enumeration({Two:2,Three:3,Four:4,Five:5,Six:6,
37 Seven:7,Eight:8,Nine:9,Ten:10,
38 Jack:11,Queen:12,King:13,Ace:14});
39
40 Card.prototype.toString = function(){
41 return this.rank.toString() + " of " + this.suit.toString();
42 };
43
44 Card.prototype.compareTo = function(that){
45 if(this.rank < that.rank) return -1;
46 if(this.rank > that.rank) return 1;
47 return 0;
48 };
49
50 Card.orderBySuit = function(a, b){
51 if(a.suit < b.suit) return -1;
52 if(a.suit > b.suit) return 1;
53 if(a.rank < b.rank) return -1;
54 if(a.rank > b.rank) return 1;
55 return 0;
56 }
57
58 function Deck(){
59 var cards = this.cards = [];
60 Card.Suit.foreach(function(s){
61 Card.Rank.foreach(function(r){
62 cards.push(new Card(s, r));
63 });
64 });
65 }
66
67 Deck.prototype.shuffle = function(){
68 var deck = this.cards, len = deck.length;
69 for(var i = len - 1; i > 0; i--){
70 var r = Math.floor(Math.random() * (i + 1)),
71 temp;
72 temp = deck[i], deck[i] = deck[r], deck[r] = temp;
73 }
74
75 return this;
76 }
77
78 Deck.prototype.deal = function(n){
79 if(this.cards.length < n) throw "Out of cards";
80 return this.cards.splice(this.cards.length - n, n);
81 }
82
83 var deck = (new Deck()).shuffle();
84 var hand = deck.deal(13).sort(Card.orderBySuit);
85
86 console.log(hand);
