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              var changing = function(money, price){
  var count = parseInt(money/price),
      bottle = count,
      lid = count,
      lidRate = 4,
      bottleRate = 2;
  (function change(){
    // 兑换盖子
    if(lid >= lidRate){
      var lGet = parseInt(lid/lidRate);
      count += lGet;
      bottle += lGet;
      lid -= lGet*(lidRate-1);
      console.log('使用瓶盖'+ lGet*lidRate +'个,兑换:'+ lGet +'瓶');
      console.log('已喝:'+ count + ', 剩余瓶盖:'+ lid +', 剩余空瓶:'+ bottle);
    // 兑换空瓶
    if(bottle >= bottleRate){
      var bGet = parseInt(bottle/bottleRate);
      count += bGet;
      bottle -= bGet;
      lid += bGet*(bottleRate-1);
      console.log('使用空瓶'+ bGet*bottleRate +'个,兑换:'+ bGet +'瓶');
      console.log('已喝:'+ count + ', 剩余瓶盖:'+ lid +', 剩余空瓶:'+ bottle);
    // 判断剩余
    if(bottle >= bottleRate || lid >= lidRate){
    } else {
      console.log('总共喝:'+ count + ', 剩余瓶盖:'+ lid +', 剩余空瓶:'+ bottle);
// 开始计算
changing(10, 2); 

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