Question

我尝试将play/pause按钮添加到计时器中，该计时器根据 isRunning 的值决定要执行的操作。当第二次点击我的按钮而不是暂停时，计时器会添加另一个setTimeout，但我无法弄清楚原因。

var isRunning = false;

function start() {
  if(isRunning == false) {
    isRunning = true;
    setInterval(time, 1000);
    document.getElementById("play").className = "fa fa-pause";
  } 
  else if(isRunning == true) {
    isRunning = false;
    document.getElementById("play").className = "fa fa-play";
    console.log(isRunning);
    clearInterval(time);
  }
}

document.getElementById("play").onclick = start;

Answer 1

var isRunning = false;
var timeoutId; // Where the timeout id will be stored.

function start() {
  if(isRunning == false) {
    isRunning = true;
    timeoutId = setInterval(time, 1000);
    document.getElementById("play").className = "fa fa-pause";
  } 
  else if(isRunning == true) {
    isRunning = false;
    document.getElementById("play").className = "fa fa-play";
    console.log(isRunning);
    clearInterval(timeoutId); // clearInterval using timeout id saved before.
  }
}

document.getElementById("play").onclick = start;

有关详细信息，请访问https://developer.mozilla.org/es/docs/Web/API/WindowTimers/setTimeout

clearInterval（）不起作用，我无法弄清楚原因

1 个答案: