function Player(name) {
  this.points = 0;
  this.name = name;
}
Player.prototype.play = function () {
  this.points += 1;
  mediator.played();
}; 

 var scoreboard = {
  element: document.getElementById('results'),
  update: function (score) {
    var i, msg = '';
    for (i in score) {
      if (score.hasOwnProperty(i)) {
        msg += '<p><strong>' + i + '<\/strong>: ';
        msg += score[i];
        msg += '<\/p>';
      }
    }
    this.element.innerHTML = msg;
  }
}; 

 var mediator = {
  players: {},
  setup: function () {
    var players = this.players;
    players.home = new Player('Home');
    players.guest = new Player('Guest');
  },
  played: function () {
    var players = this.players,
    score = {
      Home: players.home.points,
      Guest: players.guest.points
    };
    scoreboard.update(score);
  },
  keypress: function (e) {
    e = e || window.event; // IE
    if (e.which === 49) { // key "1"
      mediator.players.home.play();
      return;
    }
    if (e.which === 48) { // key "0"
      mediator.players.guest.play();
      return;
    }
  }
}; 

 // go!
mediator.setup();
window.onkeypress = mediator.keypress;

// game over in 30 seconds
setTimeout(function () {
  window.onkeypress = null;
  alert('Game over!');
}, 30000); 

 var goods = {  //库存
  'red|32G':3,
  'red|16G':5,
  'blue|32G':3,
  'blue|16G':6
}
//中介者
var mediator = (function(){
  function id(id){
    return document.getElementById(id);
  }
  var colorSelect = id('colorSelect'),
    memorySelect = id('memorySelect'),
    numberInput = id('numberInput'),
    colorInfo = id('colorInfo'),
    memoryInfo = id('memoryInfo'),
    numberInfo = id('numberInfo'),
    nextBtn = id('nextBtn');
  return{
    changed:function(obj){
      var color = colorSelect.value,
        memory = memorySelect.value,
        number = numberInput.value,
        stock = goods[color+'|'+memory];
      if(obj === colorSelect){
        colorInfo.innerHTML = color;
      }else if(obj === memorySelect){
        memoryInfo.innerHTML = memory;
      }else if(obj === numberInput){
        numberInfo.innerHTML = number;
      }
      if(!color){
        nextBtn.disabled = true;
        nextBtn.innerHTML = '请选择手机颜色';
        return;
      }
      if(!memory){
        nextBtn.disabled = true;
        nextBtn.innerHTML = '请选择内存大小';
        return;
      }
      if(Number.isInteger(number-0) && number > 0){
        nextBtn.disabled = true;
        nextBtn.innerHTML = '请输入正确的购买数量';
        return;
      }
      nextBtn.disabled = false;
      nextBtn.innerHTML = '放入购物车';
    }
  }
})();
//添加事件
colorSelect.onchange = function(){
  mediator.changed(this);
}
memorySelect.onchange = function(){
  mediator.changed(this);
}
numberInput.onchange = function(){
  mediator.changed(this);
}