Question

我需要javascript倒计时器根据小时数工作。例如如果它是5'o时钟，那么时钟应该从1小时重置。当它是6'时钟时，它应该再次复位并开始倒计时。

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我想使用以下JS。如果可以修改它会很棒。

<script>
var startTime = 59.99; //in Minutes
var doneClass = "done"; //optional styling applied to text when timer is done

function startTimer(duration, display) {
  var timer = duration, minutes, seconds;
  var intervalLoop = setInterval(function () {
    minutes = parseInt(timer / 60, 10)
    seconds = parseInt(timer % 60, 10);
    minutes = minutes < 10 ? "0" + minutes : minutes;
    seconds = seconds < 10 ? "0" + seconds : seconds;
    display.textContent = minutes + ":" + seconds;
    if (--timer < 0) {
      document.querySelector("#timer").classList.add(doneClass);
      clearInterval(intervalLoop);
     }
   }, 1000);
}

window.onload = function () {
  var setMinutes = 60 * startTime,
  display = document.querySelector("#timer");
  startTimer(setMinutes, display);
};
/**
    * Do not remove this section; it allows our team to troubleshoot and track feature adoption. 
    * TS:0002-03-069
*/
</script>

Answer 1

只需获取当前时间并从startTime中减去分钟和秒数。由于这是一个每小时倒计时器，你不在乎它是什么小时，只剩下多少分钟和秒。

var startTime = 59.99; //in Minutes
var doneClass = "done"; //optional styling applied to text when timer is done

function startTimer(duration, display) {
  var timer = duration,
    minutes, seconds;
  var intervalLoop = setInterval(function() {
    minutes = parseInt(timer / 60, 10)
    seconds = parseInt(timer % 60, 10);
    minutes = minutes < 10 ? "0" + minutes : minutes;
    seconds = seconds < 10 ? "0" + seconds : seconds;
    display.textContent = minutes + ":" + seconds;
    if (--timer < 0) {
      document.querySelector("#timer").classList.add(doneClass);
      clearInterval(intervalLoop);
    }
  }, 1000);
}

window.onload = function() {
  var now = new Date();
  var hour = now.getHours();

  if (hour > 12) {
    hour = hour - 11 + " PM"
  } else {
    hour = hour + 1 + " AM"
  }

  document.getElementById("hour").textContent = "Until " + hour;

  var setMinutes = 60 * (startTime - now.getMinutes() - (now.getSeconds() / 100)),
    display = document.querySelector("#timer");

  startTimer(setMinutes, display);
};

<span id="timer"></span><br/>
<span id="hour"></span>

Javascript根据小时数倒计时（在Unbounce中工作）

1 个答案: