函数防抖与函数节流

[luichooy]

函数防抖

function decounce(callback, delay = 300) {
  let timer = null;
  return function() {
    if (timer) {
      clearTimeout(timer);
    }

    timer = setTimeout(() => {
      callback.apply(this, arguments);
      timer = null;
    }, delay);
  };
}

函数节流

function throttle(callback, delay = 300, immediate = false) {
  let timer = null;
  let isFirst = immediate;
  return function() {
    if (timer) return;

    if (isFirst) {
      isFirst = false;
      callback.apply(this, arguments);
    } else {
      timer = setTimeout(() => {
        callback.apply(this, arguments);
        clearTimeout(timer);
        timer = null;
      }, delay);
    }
  };
}