如何在年龄计算器中确定从生日到某个年龄还剩多少年？

function calculateRemainingYears(birthday, targetAge) {
  const today = new Date();
  const birthDate = new Date(birthday);
  const currentAge = today.getFullYear() - birthDate.getFullYear();

  const remainingYears = targetAge - currentAge;

  return remainingYears;
}

const birthday = "1990-01-01";
const targetAge = 50;

const remainingYears = calculateRemainingYears(birthday, targetAge);
console.log(`从生日到 ${targetAge} 岁还剩下 ${remainingYears} 年`);