使用js获取身份证年龄的示例代码

 
 //根据身份证号获取年龄
 GetAge(identityCard) {
  let len = (identityCard + "").length;
  let strBirthday = "";
  if (len == 18) {
  //处理18位的身份证号码从号码中得到生日和性别代码
  strBirthday =
   identityCard.substr(6, 4) +
   "/" +
   identityCard.substr(10, 2) +
   "/" +
   identityCard.substr(12, 2);
  }
  if (len == 15) {
  let birthdayValue = "";
  birthdayValue = identityCard.charAt(6) + identityCard.charAt(7);
  if (parseInt(birthdayValue) < 10) {
   strBirthday =
   "20" +
   identityCard.substr(6, 2) +
   "/" +
   identityCard.substr(8, 2) +
   "/" +
   identityCard.substr(10, 2);
  } else {
   strBirthday =
   "19" +
   identityCard.substr(6, 2) +
   "/" +
   identityCard.substr(8, 2) +
   "/" +
   identityCard.substr(10, 2);
  }
  }
  //时间字符串里，必须是“/”
  let birthDate = new Date(strBirthday);
  let nowDateTime = new Date();
  let age = nowDateTime.getFullYear() - birthDate.getFullYear();
  //再考虑月、天的因素;.getMonth()获取的是从0开始的，这里进行比较，不需要加1
  if (
  nowDateTime.getMonth() < birthDate.getMonth() ||
  (nowDateTime.getMonth() == birthDate.getMonth() &&
   nowDateTime.getDate() < birthDate.getDate())
  ) {
  age--;
  }
  return age;
 }

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