js正则验证身份证号码

const idCardPattern = /^(\d{15}$|^\d{18}$|^\d{17}(\d|X|x))$/;

function validateIDCard(idCard) {
  const idCardPattern = /^(\d{15}$|^\d{18}$|^\d{17}(\d|X|x))$/;
  if (!idCardPattern.test(idCard)) {
    return false;
  }

  // 进一步验证身份证号码的校验码
  if (idCard.length === 18) {
    const weight = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
    const checkCode = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];
    let sum = 0;
    for (let i = 0; i < 17; i++) {
      sum += parseInt(idCard.charAt(i)) * weight[i];
    }
    const mod = sum % 11;
    return checkCode[mod] === idCard.charAt(17).toUpperCase();
  }

  return true;
}

// 测试
console.log(validateIDCard('11010519491231002X')); // true
console.log(validateIDCard('110105194912310021')); // false
console.log(validateIDCard('11010519491231002'));  // false