如何退出setInterval

Question

如果条件正确，我需要退出运行间隔：

var refreshId = setInterval(function() {
        var properID = CheckReload();
        if (properID > 0) {
            <--- exit from the loop--->
        }
    }, 10000);

Answer 1

使用clearInterval：

var refreshId = setInterval(function() {
  var properID = CheckReload();
  if (properID > 0) {
    clearInterval(refreshId);
  }
}, 10000);

Answer 2

已针对ES6更新

您可以设置变量的作用域，以避免污染名称空间：

const CheckReload = (() => {
  let counter = - 5;
  return () => {
    counter++;
    return counter;
  };
})();

{
const refreshId = setInterval(
  () => {
    const properID = CheckReload();
    console.log(properID);
    if (properID > 0) {
      clearInterval(refreshId);
    }
  },
  100
);
}

Answer 3

将setInterval的值传递给clearInterval。

简单示例

const interval = setInterval(() => {
  clearInterval(interval);
}, 1000)

---

倒数示例

计时器每秒钟递减，直到达到0。

let secondsToCountDown = 2

const interval = setInterval(() => {

  // just for presentation
  document.querySelector('.timer').innerHTML = secondsToCountDown

  if (secondsToCountDown === 0) {
    clearInterval(interval); // time is up
  }

  secondsToWait--;
}, 1000);

<p class="timer"></p>

---

带分隔符的倒计时示例

let secondsToCountDown = 2

const doStuffOnInterval = () => {
  document.querySelector('.timer').innerHTML = secondsToCountDown

  if (secondsToCountDown === 0) {
    stopInterval()
  }

  secondsToCountDown--;
}

const stopInterval = () => {
  clearInterval(interval);
}

const interval = setInterval(doStuffOnInterval, 1000);

<p class="timer"></p>