用js写一个倒计时程序

// 设置倒计时的结束时间
let endTime = new Date().getTime() + 60000; // 假设倒计时为 60 秒

function updateCountdown() {
  let now = new Date().getTime();
  let distance = endTime - now;

  if (distance < 0) {
    clearInterval(interval);
    console.log("倒计时结束");
    return;
  }

  let seconds = Math.floor((distance % (1000 * 60)) / 1000);

  console.log(seconds + " 秒");
}

let interval = setInterval(updateCountdown, 1000);