javaScript 权威指南读书笔记(类和模块)

对于js模拟java实现枚举，阅读了犀牛书上的例子，稍微做了下改变

/**
*This method is mainly to create an object whose prototype is p
*@param  {Object} p
*@return {Object}
**/
function inherit(p){
    if(p==null)throw new TypeError;
    if(Object.create)return Object.create(p);
    var t=typeof p;
    if(t!=="function"||t!=="object")throw new TypeError;
    function f(){};
    f.prototype=p;
    return new f();
}
/**
*Implement the enumeration
*@param  {JSON} nameToValues
*@return {Function}
**/
function enumeration(nameToValues){
    var enuFun=function(){throw "Can't instantiate Enumeration";}
    var proto=enuFun.prototype={
        constructor:enuFun,
        toString:function(){return this.name;},
        valueOf:function(){return this.value;},
        toJSON:function(){return this.name}
    };
    enuFun.values=[];
    for(name in nameToValues){
        var e=inherit(proto);
        e.name=name;
        e.value=nameToValues[name];
        enuFun[name]=e;
        enuFun.values.push(e);
    }
    enuFun.foreach=function(f,c){
        for(var i=0;i<this.values.length;i++)f.call(c,this.values[i]);
    }
    
    return enuFun;
    
}

/**
*The constructor of Card
**/
function Card(suit,rank){
    this.suit=suit;
    this.rank=rank;
}
//create enumeration for Card
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});

//Attach some methods to Card's prototype.It's one of the way implementing inheritance

/**
* Return the description of one card.
**/
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.orderByRank=function(a,b){
    return a.compareTo(b);
}
Card.oderBySuit=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;
}

function Deck(){
    var cards=this.cards=[];
    Card.SUIT.foreach(function(suit){
        Card.RANK.foreach(function(rank){
            cards.push(new Card(suit,rank));
        });
    });
}
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(num){
    var deck=this.cards,len=deck.length;
    if(num>len) throw "Out of cards!";
    return deck.splice(len-num,num);
}

var deck=new Deck().shuffle();

function distributeCards(n){
    if(n>10)throw "The number of  game players  can't exceed 10";
    var total=deck.cards.length,per=total/n,remain=total%n;
    var i=0,ordinalArr=['First','Second','Third','Fourth','Fifth','Sixth','Seventh','Eighth','Nineth','Tenth'];
    while(i<n){
        console.log("------------------------------------The "+ordinalArr[i]+" person's Cards------------------------")
        deck.deal(per).sort(Card.sortBySuit).forEach(function(card){
            console.log(card.toString());
        });
        i++;
    }
    console.log("------------------------------------There are "+remain+" cards remained----------------------");
    deck.cards.forEach(function(card){
            console.log(card.toString());
        });
}
distributeCards(5);