从json中随机选择一张信用卡[重复]答案

【问题标题】：Randomly select a credit card from json [duplicate]从json中随机选择一张信用卡[重复]
【发布时间】：2020-07-22 03:22:13
【问题描述】：

我有以下我制作的cardInfo.json，我想使用node.js随机选择卡片及其信息并将其存储在变量中。

{
    "card1": {
        "cardNumber": "",
        "cvv": "",
        "expMonth":"",
        "expDay":"",
        "name":""
        },
    "card2": {
        "cardNumber": "",
        "cvv": "",
        "expMonth":"",
        "expDay":"",
        "name":""
    }
}

【问题讨论】：

标签： javascript node.js json random node-modules

【解决方案1】：

您可以使用Math.random() 函数生成一个随机整数并返回如下所示的随机卡片。

const cards = {
  "card1": {
    "cardNumber": "1",
    "cvv": "1",
    "expMonth": "1",
    "expDay": "1",
    "name": "1"
  },
  "card2": {
    "cardNumber": "2",
    "cvv": "2",
    "expMonth": "2",
    "expDay": "2",
    "name": "2"
  },
  "card3": {
    "cardNumber": "3",
    "cvv": "3",
    "expMonth": "3",
    "expDay": "3",
    "name": "3"
  },
  "card4": {
    "cardNumber": "4",
    "cvv": "4",
    "expMonth": "4",
    "expDay": "4",
    "name": "4"
  },
  "card5": {
    "cardNumber": "5",
    "cvv": "5",
    "expMonth": "5",
    "expDay": "5",
    "name": "5"
  },
  "card6": {
    "cardNumber": "6",
    "cvv": "6",
    "expMonth": "6",
    "expDay": "6",
    "name": "6"
  }
};


const getRandomInt = () => {
  const max = Object.keys(cards).length;
  return Math.floor(Math.random() * Math.floor(max));
}

const getCard = () => {
  const num = getRandomInt();
  const cardKey = Object.keys(cards)[num];
  return cards[cardKey];
}

console.log(getCard())

【讨论】：

【解决方案2】：

我可能会将卡片放在一个数组中，这样会更容易......如果不是，如果名称实际上是cardXX，您也可以这样做：

const cards = { ... }
const max = Object.keys(cards).length
const random = Math.floor(Math.random()*(max)+1)

然后

const randomCard = cards[`card${random}`]

here's an example

【讨论】：