JavaScript学习笔记整理_简单实现枚举类型,扑克牌应用

如下所示：

//实现枚举类型,扑克牌应用
function createnum(p){
  //构造函数
  var enumeration = function(){throw 'can not instantiate enumerations';};
  //重写原型并将原型赋值给变量proto
  var proto = enumeration.prototype = {
    constructor:enumeration,
    tostring:function(){return this.name;},
    valueof:function(){return this.value;},
    tojson:function(){return this.name;}
  };
  //添加类属性,方法
  enumeration.values = [];
  for(var n in p){ //将对象p的每个元素都单独转存到一个单独的对象o里面,并将这些对象o存入类属性values数组中
    var o = object.create(proto); //对象o继承了enumeration的3个实例方法和构造函数
    enumeration.prototype.valueof = function(){return this.value*1;}; //重写原型的valueof方法
    o.name = n;
    o.value = p[n];
    enumeration[n] = o; //添加类属性name,值为对象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);
/*结果:枚举对象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本身继承自枚举对象,继承并修改了valueof方法用来将value转化为数字做计算
 
//===使用函数createnum()来表示一副54张的扑克牌==
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;
};
//定义一副标准扑克牌
function deck(){
  var cards = this.cards = [];
  card.suit.foreach(function(s){ //对每个花色执行
    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;
};
//发牌,并返回牌的数组
deck.prototype.deal = function(n){
  if(this.cards.length<n) throw 'out of cards';
  return this.cards.splice(this.cards.length-n, n);
};
//开始:
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);
}

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