如何改变倒计时的显示？

<div id="countdown"></div>

#countdown {
  font-size: 24px;
  font-weight: bold;
  text-align: center;
}

// 目标时间，可以根据需求进行修改
var targetDate = new Date("2022-01-01");

function updateCountdown() {
  var currentDate = new Date();
  var timeDifference = targetDate - currentDate;

  // 计算剩余的天、小时、分钟和秒
  var days = Math.floor(timeDifference / (1000 * 60 * 60 * 24));
  var hours = Math.floor((timeDifference % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  var minutes = Math.floor((timeDifference % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((timeDifference % (1000 * 60)) / 1000);

  // 将剩余的时间显示在倒计时容器中
  var countdownElement = document.getElementById("countdown");
  countdownElement.innerHTML = days + "天 " + hours + "小时 " + minutes + "分钟 " + seconds + "秒";
}

// 每秒更新一次倒计时
setInterval(updateCountdown, 1000);