Sample code for getting ID age using js

 /**
  Judge gender according to ID number 
 15 ID card number: number 7 , 8 The digit is the year of birth ( Double digits ) , No. 9 , 10 The position is the month of birth, the first 11 , 12 Bit represents the date of birth 
 18 ID card number: number 7 , 8 , 9 , 10 The digit is the year of birth (4 Number of digits ) , No. 11 , No. 12 The position is the month of birth, 
  No. 1 13 , 14 The number represents the date of birth, and the number 17 Bits represent gender, odd numbers are male and even numbers are female. 
 */
 // Get the age according to the ID number 
 GetAge(identityCard) {
  let len = (identityCard + "").length;
  let strBirthday = "";
  if (len == 18) {
  // Deal with 18 The ID number of digits gets the birthday and gender code from the number 
  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);
  }
  }
  // In the time string, it must be " / " 
  let birthDate = new Date(strBirthday);
  let nowDateTime = new Date();
  let age = nowDateTime.getFullYear() - birthDate.getFullYear();
  // Then consider the factors of months and days ;.getMonth() Obtained from the 0 At the beginning, we compare here, and we don't need to add 1
  if (
  nowDateTime.getMonth() < birthDate.getMonth() ||
  (nowDateTime.getMonth() == birthDate.getMonth() &&
   nowDateTime.getDate() < birthDate.getDate())
  ) {
  age--;
  }
  return age;
 }

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