js 将时间戳转化为倒计时

将时间戳转换为倒计时的方法可以参考以下代码示例：

function countdown(timestamp) {
  const timer = setInterval(() => {
    const currentTime = Math.round(new Date().getTime() / 1000); // 获取当前时间戳
    const remainingTime = timestamp - currentTime; // 计算剩余时间戳

    if (remainingTime <= 0) {
      clearInterval(timer); // 清除定时器
      return "倒计时结束";
    }

    const days = Math.floor(remainingTime / (60 * 60 * 24));
    const hours = Math.floor((remainingTime % (60 * 60 * 24)) / (60 * 60));
    const minutes = Math.floor((remainingTime % (60 * 60)) / 60);
    const seconds = remainingTime % 60;

    const countdownStr = `${days.toString().padStart(2, '0')}:${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;

    console.log(countdownStr); // 打印倒计时

  }, 1000);
}

countdown(1633440000); // 假设传入的时间戳为1633440000