javascript - clearInterval() 不起作用，我不明白为什么

Question

我正在尝试将 play/pause 按钮添加到一个计时器，该计时器具有根据 isRunning 的值决定要做什么的功能。第二次单击我的按钮而不是暂停时，计时器似乎添加了另一个 setTimeout，我不明白为什么。

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;

欲了解更多信息，请访问 https://developer.mozilla.org/es/docs/Web/API/WindowTimers/setTimeout