//實(shí)現(xiàn)枚舉類型,撲克牌應(yīng)用function creatEnum(p){  //構(gòu)造函數(shù)  var Enumeration = function(){throw 'can not Instantiate Enumerations';};  //重寫原型并將原型賦值給變量proto  var proto = Enumeration.prototype = {    constructor:Enumeration,    toString:function(){return this.name;},    valueOf:function(){return this.value;},    toJSON:function(){return this.name;}  };  //添加類屬性,方法  Enumeration.values = [];  for(var n in p){ //將對(duì)象p的每個(gè)元素都單獨(dú)轉(zhuǎn)存到一個(gè)單獨(dú)的對(duì)象o里面,并將這些對(duì)象o存入類屬性values數(shù)組中    var o = Object.create(proto); //對(duì)象o繼承了Enumeration的3個(gè)實(shí)例方法和構(gòu)造函數(shù)    Enumeration.prototype.valueOf = function(){return this.value*1;}; //重寫原型的valueof方法    o.name = n;    o.value = p[n];    Enumeration[n] = o; //添加類屬性name,值為對(duì)象o    Enumeration.values.push(o);  }  Enumeration.foreach = function (f,c) {    for(var i =0;i<this.values.length;i++){      f.call(c,this.values[i]);    }  };  return Enumeration;}//===var Coin = creatEnum( {Penny:1,Nickel:5,Dime:10,Quarter:25} );console.log(Coin);/*結(jié)果:枚舉對(duì)象Coin { [Function] values: [ { [Number: 10] name: 'Penny', value: 1 },   { [Number: 50] name: 'Nickel', value: 5 },   { [Number: 100] name: 'Dime', value: 10 },   { [Number: 250] name: 'Quarter', value: 25 } ], Penny: { [Number: 10] name: 'Penny', value: 1 }, Nickel: { [Number: 50] name: 'Nickel', value: 5 }, Dime: { [Number: 100] name: 'Dime', value: 10 }, Quarter: { [Number: 250] name: 'Quarter', value: 25 }, foreach: [Function] } */console.log(Coin.Dime+2); //102 Coin.Dime本身繼承自枚舉對(duì)象,繼承并修改了valueof方法用來(lái)將value轉(zhuǎn)化為數(shù)字做計(jì)算 //===使用函數(shù)creatEnum()來(lái)表示一副54張的撲克牌==function Card(suit,rank){  this.suit = suit;  this.rank = rank;}Card.Suit = creatEnum( {Clubs:1,Diamonds:2,Heates:3,Spades:4,Joker:5} );Card.Rank = creatEnum( {Three:3,Four:4,Five:5,Six:6, Seven:7,Eight:8,Nine:9,Ten:10,            Jack:11,Queen:12,King:13,Ace:14,Two:15,SmallJoker:16,BigJoker:17} );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;  return 0;};Card.orderByRank = function(a,b){  if(a.rank< b.rank) return -1;  if(a.rank> b.rank) return 1;  return 0;};//定義一副標(biāo)準(zhǔn)撲克牌function Deck(){  var cards = this.cards = [];  Card.Suit.foreach(function(s){ //對(duì)每個(gè)花色執(zhí)行    if(s!=5) {      Card.Rank.foreach(function (r) {        if (r != 16 && r != 17) {          cards.push(new Card(s, r));        }      });    }else{      Card.Rank.foreach(function (r){        if(r == 16) cards.push(new Card(s, r));        if(r == 17) cards.push(new Card(s, r));      });    }  });}//洗牌,并返回洗好的牌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;};//發(fā)牌,并返回牌的數(shù)組Deck.prototype.deal = function(n){  if(this.cards.length<n) throw 'Out of cards';  return this.cards.splice(this.cards.length-n, n);};//開(kāi)始:var deck = new Deck();var deck1 =deck.shuffle();var n = 17;var hand1 = deck1.deal(n).sort(Card.orderByRank);for(var i = 0;i<n;i++){  var body = document.getElementById('body');  var div = document.createElement('div');  div.style.width = '50px';  div.style.height = '100px';  div.style.border = '1px solid gray';  div.style.float = 'left';  div.innerHTML = hand1[i].suit.name+' '+hand1[i].rank.name;  body.appendChild(div);  console.log(hand1[i].suit.name+' '+hand1[i].rank.name);}