function isValidIDCard(idCard) {
  // 身份證正則表達(dá)式
  var reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;
  return reg.test(idCard);
}

console.log(isValidIDCard('110101199003072733')); // true
console.log(isValidIDCard('11010119900307273X')); // true
console.log(isValidIDCard('1101011990030727')); // false
console.log(isValidIDCard('110101199003072734')); // false

function is22YearsOld(idCard) {
  // 獲取身份證號碼中的出生日期
  var birth = idCard.match(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})(\d|X)$/);
  if (birth == null) {
    // 身份證號碼格式不正確，直接返回 false
    return false;
  }
  var year = birth[2];
  var month = birth[3];
  var day = birth[4];
  // 計(jì)算此人的出生日期
  var birthday = new Date(year + '-' + month + '-' + day);
  // 計(jì)算此人的年齡
  var age = new Date().getFullYear() - birthday.getFullYear();
  if (new Date().getMonth() < birthday.getMonth() ||
      (new Date().getMonth() == birthday.getMonth() && new Date().getDate() < birthday.getDate())) {
    age--;
  }
  // 判斷此人的年齡是否等于 22
  return age === 22;
  // 判斷此人年齡是否小于 22
  return age < 22;
}

console.log(is22YearsOld('110101200102151234')); // true
console.log(is22YearsOld('110101199912312345')); // false