将暂停选项设置为 Javascript 倒数计时器脚本

Question

我正在创建一个倒数计时器。所以这是我目前的代码。

function countdownTimeStart() {

var el = document.getElementById('demo');
var cancel = document.getElementById('cancel');

/* Start count the time in timer panel */
var time = document.getElementById("picker-dates").value;
time = time.split(':');

var x = setInterval(function () {

    // set hours, minutes and seconds, decrease seconds
    var hours = time[0];
    var minutes = time[1];
    var seconds = time[2]--;

    console.log(time);

    // create a function to handle the cancel
    function cancelCountdown(){
        el.innerHTML = "00:00:00";
        clearInterval(x);
    }
    // attach listener to cancel if cancel button is clicked
    cancel.addEventListener( 'click', cancelCountdown);

    // if seconds are negative, set them to 59 and reduce minutes
    if (time[2] == -1) {
        time[1]--;
        time[2] = 59
    }

    // if minutes are negative, set them to 59 and reduce hours
    if (time[1] == -1) {
        time[0]--;
        time[1] = 59
    }

    // Output the result in an element with id="demo"
    if( seconds == 0 && minutes == 0 && hours == 0 ){
        clearInterval(x);
        el.innerHTML = "00:00:00";
    } else if (seconds < 10) {
        el.innerHTML = hours + ": " + minutes + ": " + "0" + seconds + " ";
    } else {
        el.innerHTML = hours + ": " + minutes + ": " + seconds + " ";
    }

}, 1000);}

所以我想为此创建一个暂停按钮。我提到了类似的问题，例如Javascript - Pausing setInterval()。

在 jquery 中创建暂停选项似乎很容易。但我不知道如何将它应用到我的脚本中。谁能帮帮我。

Answer 1

在暂停点击时，您可以创建一个像savedTime 这样的对象来保存time 数组的当前值。然后，当点击start 时，您可以检查savedTime 中是否有任何内容。如果是这样，则将hours、minutes 和seconds 分配给该对象的值；否则，将它们的值设置为输入中的默认值。例如，类似：

var el = document.getElementById('demo');
var cancel = document.getElementById('cancel');
var savedTime;
function countdownTimeStart() {
  /* Start count the time in timer panel */
  var timeValue = document.getElementById("picker-dates").value;
  var time;
  if (savedTime) {
    time = savedTime;
    savedTime = null;
  } else time = timeValue.split(':');

  var x = setInterval(function () {
    // set hours, minutes and seconds, decrease seconds
    var hours = time[0];
    var minutes = time[1];
    var seconds = time[2]--;

    // rest of countdownTimeStart is as normal
    // ...
  });

  // Attach this function to your pause button:
  function pauseTimer() {
    savedTime = time;
    clearInterval(x);
  }
}