如何在JavaScript中显示年龄(会员)计算器的结果？

<input type="date" id="birthdate">
<button onclick="calculateAge()">计算年龄</button>
<p id="result"></p>

function calculateAge() {
  var birthdate = new Date(document.getElementById("birthdate").value);
  var currentDate = new Date();
  
  var age = currentDate.getFullYear() - birthdate.getFullYear();
  
  // 如果当前月份小于出生月份，或者当前月份等于出生月份但当前日期小于出生日期，则年龄减一
  if (currentDate.getMonth() < birthdate.getMonth() || (currentDate.getMonth() === birthdate.getMonth() && currentDate.getDate() < birthdate.getDate())) {
    age--;
  }
  
  document.getElementById("result").textContent = "您的年龄是：" + age + "岁";
}