防抖节流

防抖

function debounce(fn, delay = 50) {
  let timer;
  return function () {
    if (timer) {
      clearTimeout(timer);
    }
    timer = setTimeout(() => {
      fn();
    }, delay);
  };
}

节流

function throttle(fn, delay = 50) {
  let timer = null;
  let flag = true;
  return function () {
    if (!flag) return;
    flag = false;
    timer = setTimeout(function () {
      flag = true;
      fn();
      clearTimeout(timer);
    }, delay);
  };
}

参考

• JavaScript 防抖（debounce）与节流（thorttle）