[分享]javascript中的观察者模式实现.顺便散分.该如何处理

<script type="text/javascript">
// 经验系统
var Experience = function(param) {
    this.name = param.name;
    // 经验值
    this.expVal = param.expVal;
    this.players = [];
}
// 发放经验
Experience.prototype.giveExp = function(player) {
    console.log("系统送给[" + player.name + "]" + this.expVal + "点经验.");
}

// 玩家
var Player = function(param) {
    this.name = param.name;    
}

// 申请经验模式
Player.prototype.apply = function(experience) {
    var players = experience.players;
    var isExist = false;
    for(var i=0,len=players.length;i<len;i++) {
        if(players[i] == this) {
            isExist = true;
            break;
        }
    }

    if(!isExist) {
        players.push(this);
    }

    return this;
}
// 领取经验
Player.prototype.getExp = function(experience) {
    var players = experience.players;
    for(var i=0,len=players.length;i<len;i++) {
        if(players[i] == this) {
            experience.giveExp(this);
            break;
        }
    }

    return this;
}



// 测试

// 申明玩家
var player1 = new Player({"name":"张三"}); // 玩家1,等级4
var player2 = new Player({"name":"李四"}); // 玩家2,等级12

// 申明经验系统
var exp2000 = new Experience({name:"2000点经验",expVal:2000});
var exp3000 = new Experience({name:"3000点经验",expVal:3000});

// 等级1~10能申请3000点经验
player1.apply(exp3000);
// 等级11以上能申请2000点经验
player2.apply(exp2000);

// 去NPC处领取经验:
player1.getExp(exp3000);
player2.getExp(exp2000);

/*
输出:
系统送给[张三]3000点经验.
系统送给[李四]2000点经验.
*/
</script>