Javascript 倒数计时器重复和重复计数总数

Question

我有一个从 25 -> 0 的 JavaScript 倒计时器。

var count=25;

var counter=setInterval(timer, 1000); //1000 will  run it every 1 second

function timer()
{
  count=count-1;
  if (count <= 0)
  {
    clearInterval(counter);
    return;
   }

 document.getElementById("timer").innerHTML=count; // watch for spelling
 }

div HTML

<span id="timer">25</span>

现在我希望倒计时在等待 5 秒后自动重复，然后从 25 -> 0 重新开始。我想计算倒计时重复的次数。这可能吗？

请帮忙。

Answer 1

您可以尝试将整个代码包装到一个函数(下例中的 countTimers())中，该函数每 30 秒运行一次(每个计时器后 5 秒)。然后，设置一个计数器(下例中的timersCount)来计算将运行的次数。

请参阅下面的示例:

var timersCount = 0, stopped = false, count, counter; // make count, counter global variables so buttons can access them
var timerCounter = setInterval(countTimers, 30000);
countTimers(); // run countTimers once to start
function timer() {
  count = count-1;
  document.getElementById("timer").innerHTML=count;
  if(count <= 0) {
    clearInterval(counter);
    return;
  }
}
function countTimers() {
  timersCount++;

  // as per request in the comments, you can set a timer counter as well:
  document.getElementById("totalcounter").innerHTML = timersCount;

  count = 25;
  counter = setInterval(timer, 1000);

}

// button code:
document.getElementById("reset").addEventListener("click", function() {
  clearInterval(timerCounter);
  clearInterval(counter);
  count = 25;
  document.getElementById("timer").innerHTML=count;
  timersCount = 0;
  document.getElementById("totalcounter").innerHTML = timersCount;
  stopped = true;
});
document.getElementById("stop").addEventListener("click", function() {
  if(stopped)
    return;
  clearInterval(counter);
  stopped = true;
});
document.getElementById("start").addEventListener("click", function() {
  if(!stopped)
    return;
  stopped = false;
  counter = setInterval(timer, 1000);
  setTimeout(function() {
    clearInterval(counter);
    timerCounter = setInterval(countTimers, 30000);
    countTimers();
  }, count*1000);
});

Timer: <span id="timer">25</span><br>
Number of times run: <span id="totalcounter">1</span>

<br><br>
<button id="reset">Reset</button>
<button id="stop">Stop</button>
<button id="start">Start (if stopped)</button>