Javascript：setInterval停止使用clearInterval时的计时器无法再次重新启动它

Question

I'm working on Timer of hrs seconds minutes. 我正在使用小时秒分钟计时器。 I use setInterval for start it. 我使用setInterval启动它。 but when click on button to restart the timer it doesn't work again. 但是点击按钮重新启动计时器后，它将不再起作用。 The button suppose to clear the timer ( clearInterval ), then restart it again. 该按钮应该清除计时器（clearInterval），然后重新启动它。

I Tried calling the function which contains the timer after clearInterval but timer still doesn't work. 我尝试在clearInterval之后调用包含计时器的函数，但是计时器仍然无法正常工作。

Timer Code 计时器代码

function gameTimer(intervalTime){
    var input = {
        hours: 0,
        minutes: 0,
        seconds: 0
    };

    var timestamp = new Date(input.hours, input.minutes, input.seconds);

    var interval = intervalTime;

    setInterval(function () {
        timestamp = new Date(timestamp.getTime() + interval * 1000);
        document.querySelector('.countdown2').innerHTML = timestamp.getHours() + 'h:' 
        + timestamp.getMinutes() + 'm:' + timestamp.getSeconds() + 's';
    }, Math.abs(interval) * 1000);

}
gameTimer(1);

reset function 重置功能

 function resetFunc(){

   clearInterval(gameTimer(0))


}
let reset = document.getElementById('restart');
reset.addEventListener('click', resetFunc);

after this function i call the timer function again to restart the timer again but it's not working 此功能后，我再次调用计时器功能以再次重新启动计时器，但是它不起作用

gameTimer(1);

Answer 1

The problem 问题

You are not return ing from gameTimer function. 您没有从gameTimer函数return 。 In order to subscribe to setInterval , you need to get the value from it. 为了订阅setInterval ，您需要从中获取值。 So the code would go: 所以代码会去：

function gameTimer(intervalTime){
    var input = {
        hours: 0,
        minutes: 0,
        seconds: 0
    };

    var timestamp = new Date(input.hours, input.minutes, input.seconds);

    var interval = intervalTime;

    // here!!
    return setInterval(function () {
        timestamp = new Date(timestamp.getTime() + interval * 1000);
        document.querySelector('.countdown2').innerHTML = timestamp.getHours() + 'h:' 
        + timestamp.getMinutes() + 'm:' + timestamp.getSeconds() + 's';
    }, Math.abs(interval) * 1000);

}

And your resetFunc has a problem too: 而且您的resetFunc也有问题：

function resetFunc(){

   clearInterval(gameTimer(0))

}

this would start the timer, but at the same time clear the interval returned from gameTimer . 这将启动计时器，但同时清除gameTimer返回的间隔。 So in essence it would do just nothing. 因此，从本质上讲，它什么也不做。

The answer 答案

So a complete answer would go like this: 因此，完整的答案将如下所示：

<html>
  <head>
    <script>
        window.onload = function(){

          let isTimerRunning = false
          let intervalRef

          function gameTimer(intervalTime){
              var input = {
                  hours: 0,
                  minutes: 0,
                  seconds: 0
              };

              var timestamp = new Date(input.hours, input.minutes, input.seconds);

              var interval = intervalTime;

              // here!!
              return setInterval(function () {
                console.log('hey')
              }, Math.abs(interval) * 1000);

          }

          function toggleTimer(interval){
            if (isTimerRunning){
              isTimerRunning = false
              clearInterval(intervalRef)
            }
            else{
              isTimerRunning = true
              intervalRef = gameTimer(interval)
            }
          }

          let reset = document.getElementById('restart');
          reset.addEventListener('click', function(){toggleTimer(1)});
        }
    </script>
  </head>
  <body>
    <button id = 'restart'>
      toggle
    </button>
  </body>
</html>

Note that I have simplified the logic in your callback for setInterval . 请注意，我已经简化了setInterval的回调逻辑。

Check on CodeSandbox Too 也检查CodeSandbox

Answer 2

 var interval, intervalTime2 = 1; function gameTimer(intervalTime){ if (interval){ clearInterval(interval); }; intervalTime2 = intervalTime; var input = { hours: 0, minutes: 0, seconds: 0 }; var timestamp = new Date(input.hours, input.minutes, input.seconds); interval = setInterval(function () { timestamp = new Date(timestamp.getTime() + intervalTime * 1000); document.querySelector('.countdown2').innerHTML = timestamp.getHours() + 'h:' + timestamp.getMinutes() + 'm:' + timestamp.getSeconds() + 's'; }, Math.abs(intervalTime) * 1000); } gameTimer(1); function resetFunc(){ gameTimer(intervalTime2); } let reset = document.getElementById('restart'); reset.addEventListener('click', resetFunc);

 <span class="countdown2"></span> <button id="restart">Restart</button>

Javascript：setInterval停止使用clearInterval时的计时器无法再次重新启动它

问题描述

2 个解决方案

解决方案1
2 已采纳 2019-06-02 14:47:32

The problem 问题

The answer 答案

解决方案2
0 2019-06-03 03:57:40

Javascript：setInterval停止使用clearInterval时的计时器无法再次重新启动它

问题描述

2 个解决方案

解决方案1 2 已采纳 2019-06-02 14:47:32

The problem 问题

The answer 答案

解决方案2 0 2019-06-03 03:57:40

解决方案1
2 已采纳 2019-06-02 14:47:32

解决方案2
0 2019-06-03 03:57:40