自动倒数计时器-Javascript

Question

我正在尝试使计时器在第一个倒计时结束后自动更改为第二个new Date()。这样做的目的是在需要更改倒计时日期的情况下，它不再需要手动编辑和上传js文件。但是我还没有弄清楚怎么做。下面是我尝试过的脚本，输出为“ EXPIRED”。我在哪里做错了？感谢您的支持！

<script>
// Set the date we're counting down to
var countDownDate = new Date("Jan 5, 2020 14:00:00").getTime();
var countDownDate2 = new Date("Jan 15, 2020 14:00:00").getTime();

// Update the count down every 1 second
var x = setInterval(function() {

  // Get today's date and time
  var now = new Date().getTime();

  // Find the distance between now and the count down date
  var distance = countDownDate - now;
  var distance2 = countDownDate2 - now;
  var a = distance;

  // Time calculations for days, hours, minutes and seconds
  var days = Math.floor(a / (1000 * 60 * 60 * 24));
  var hours = Math.floor((a % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  var minutes = Math.floor((a % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((a % (1000 * 60)) / 1000);

  // Output the result in an element with id="demo"
  document.getElementById("demo").innerHTML = days + "d " + hours + "h "
  + minutes + "m " + seconds + "s ";

  // Change to another exp.
  if (distance < 0 && distance2 >0) {
   function changeDate() {
   a = distance2; 
   }
  }
  // If the count down is over, write some text 
  else {
    clearInterval(x);
    document.getElementById("demo").innerHTML = "EXPIRED";
  }
}, 1000);
</script>

Answer 1

问题是您查看距离是否小于1且distance2大于1。但是，当距离仍处于活动状态时（在撰写本文时就是这种情况），它将自动进入else分支。