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js实现cc

2026-04-06 16:37:21JavaScript

在JavaScript中实现信用卡（Credit Card，简称CC）相关功能通常涉及验证、格式化或模拟生成信用卡号。以下是几种常见需求的实现方法：

信用卡号验证（Luhn算法）

Luhn算法是信用卡号验证的标准方法，以下为JavaScript实现：

function isValidCreditCard(cardNumber) {
  const cleaned = cardNumber.replace(/\D/g, '');
  let sum = 0;
  let shouldDouble = false;

  for (let i = cleaned.length - 1; i >= 0; i--) {
    let digit = parseInt(cleaned.charAt(i), 10);

    if (shouldDouble) {
      digit *= 2;
      if (digit > 9) digit -= 9;
    }

    sum += digit;
    shouldDouble = !shouldDouble;
  }

  return sum % 10 === 0;
}

信用卡号格式化

格式化显示信用卡号（每4位加空格）：

function formatCreditCard(cardNumber) {
  return cardNumber.replace(/\s+/g, '').replace(/(\d{4})/g, '$1 ').trim();
}

信用卡类型识别

通过卡号前缀识别卡类型：

function detectCardType(cardNumber) {
  const patterns = {
    visa: /^4/,
    mastercard: /^5[1-5]/,
    amex: /^3[47]/,
    discover: /^6(?:011|5)/
  };

  for (const [type, pattern] of Object.entries(patterns)) {
    if (pattern.test(cardNumber)) return type;
  }
  return 'unknown';
}

生成测试用信用卡号

生成符合Luhn算法的测试卡号（仅用于测试）：

js实现cc

function generateTestCard(bin = '411111') {
  let cardNumber = bin;
  while (cardNumber.length < 15) {
    cardNumber += Math.floor(Math.random() * 10);
  }

  let sum = 0;
  let shouldDouble = true;

  for (let i = cardNumber.length - 1; i >= 0; i--) {
    let digit = parseInt(cardNumber.charAt(i), 10);
    if (shouldDouble) {
      digit *= 2;
      if (digit > 9) digit -= 9;
    }
    sum += digit;
    shouldDouble = !shouldDouble;
  }

  const checkDigit = (10 - (sum % 10)) % 10;
  return cardNumber + checkDigit;
}