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Timur Musharapov
Asked:2020-02-21 18:07:29 +0000 UTC2020-02-21 18:07:29 +0000 UTC

我得到未定义而不是数字

  • 772

有一个代码：

var coinsProfit = {
  "etf_china": {
    "plus": 100,
    "minus": -50
  },
  "red_etf_china": {
    "plus": 100,
    "minus": -50
  },
  "etf_america": {
    "plus": 100,
    "minus": -40
  },
  "red_etf_america": {
    "plus": 100,
    "minus": -40
  },
  "bitcoin": {
    "plus": 2000,
    "minus": -30
  },
  "red_bitcoin": {
    "plus": 2000,
    "minus": -30
  },
  "dollar": {
    "plus": 60,
    "minus": -200
  },
  "red_dollar": {
    "plus": 60,
    "minus": -200
  },
  "eu": {
    "plus": 80,
    "minus": -40
  },
  "red_eu": {
    "plus": 80,
    "minus": -40
  },
  "gbr": {
    "plus": 555,
    "minus": -20
  },
  "red_gbr": {
    "plus": 555,
    "minus": -20
  },
  "rub": {
    "plus": 666,
    "minus": -50
  },
  "red_rub": {
    "plus": 666,
    "minus": -50
  },
  "yen": {
    "plus": 222,
    "minus": -30
  },
  "red_yen": {
    "plus": 222,
    "minus": -30
  },
  "etf_gold": {
    "plus": 777,
    "minus": -35
  },
  "red_etf_gold": {
    "plus": 777,
    "minus": -35
  },
  "etf_IT": {
    "plus": 888,
    "minus": -11
  },
  "red_etf_IT": {
    "plus": 888,
    "minus": -11
  },
  "etf_usa": {
    "plus": 73,
    "minus": -88
  },
  "red_etf_usa": {
    "plus": 73,
    "minus": -88
  },
  "etf_japan": {
    "plus": 200,
    "minus": -98
  },
  "red_etf_japan": {
    "plus": 200,
    "minus": -98
  }
};
var coinsDataList = Object.keys(this.coinsProfit);

function plus(coinRandom) {
  getEquelsCoin(coinRandom);
};

function minus(coinRandom) {
  getEquelsCoin(coinRandom, 'minus');
};

function getEquelsCoin(coinRandom, sign = 'plus') {
  for (var key in coinsProfit) {
    if (key == coinRandom) {
      coinsProfit[key].plus;
      if (sign == 'plus') {
        return coinsProfit[key].plus;
      } else {
        return coinsProfit[key].minus;
      }
    }
  }
};
let count = 0;
coinRandom = coinsDataList[Math.floor(Math.random() * coinsDataList.length)];
count += plus(coinRandom);

UPD：如果您写入函数

console.log(coinsProfit[coinRandom].plus);
return coinsProfit[coinRandom].plus;

然后显示一个数字，但调用时的函数本身由于某种原因返回未定义。

javascript

2 个回答

  1. Best Answer
        function getEquelsCoin (coinRandom, sign = 'plus') {
        return coinsProfit[coinRandom] ? coinsProfit[coinRandom][sign] : undefined;
    };

    如果没有将 2 个参数传递给getEquelsCoin它将是默认值

    • 3

  2. 你犯了几个错误。最大的错误，你忘了return。

    查看带有注释的示例。

    var coinsProfit = {
  "etf_china": {
    "plus": 100,
    "minus": -50
  },
  "red_etf_china": {
    "plus": 100,
    "minus": -50
  },
  "etf_america": {
    "plus": 100,
    "minus": -40
  },
  "red_etf_america": {
    "plus": 100,
    "minus": -40
  },
  "bitcoin": {
    "plus": 2000,
    "minus": -30
  },
  "red_bitcoin": {
    "plus": 2000,
    "minus": -30
  },
  "dollar": {
    "plus": 60,
    "minus": -200
  },
  "red_dollar": {
    "plus": 60,
    "minus": -200
  },
  "eu": {
    "plus": 80,
    "minus": -40
  },
  "red_eu": {
    "plus": 80,
    "minus": -40
  },
  "gbr": {
    "plus": 555,
    "minus": -20
  },
  "red_gbr": {
    "plus": 555,
    "minus": -20
  },
  "rub": {
    "plus": 666,
    "minus": -50
  },
  "red_rub": {
    "plus": 666,
    "minus": -50
  },
  "yen": {
    "plus": 222,
    "minus": -30
  },
  "red_yen": {
    "plus": 222,
    "minus": -30
  },
  "etf_gold": {
    "plus": 777,
    "minus": -35
  },
  "red_etf_gold": {
    "plus": 777,
    "minus": -35
  },
  "etf_IT": {
    "plus": 888,
    "minus": -11
  },
  "red_etf_IT": {
    "plus": 888,
    "minus": -11
  },
  "etf_usa": {
    "plus": 73,
    "minus": -88
  },
  "red_etf_usa": {
    "plus": 73,
    "minus": -88
  },
  "etf_japan": {
    "plus": 200,
    "minus": -98
  },
  "red_etf_japan": {
    "plus": 200,
    "minus": -98
  }
};
var coinsDataList = Object.keys(this.coinsProfit);

function plus(coinRandom) {
  return getEquelsCoin(coinRandom); // Не было слова return
};

function minus(coinRandom) {
  return getEquelsCoin(coinRandom, 'minus'); // Не было слова return
};

function getEquelsCoin(coinRandom, sign = 'plus') {
  if (coinsProfit[coinRandom])
    return coinsProfit[coinRandom][sign];
  else
    throw new Error(`${coinRandom} not found`);
};
let count = 0;
coinRandom = coinsDataList[Math.floor(Math.random() * coinsDataList.length)];
console.log(plus(coinRandom))

    • 3

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