Javascript滚动偏移量

function throttle(func, delay) {
  let lastCall = 0;
  return function(...args) {
    const now = new Date().getTime();
    if (now - lastCall < delay) {
      return;
    }
    lastCall = now;
    return func(...args);
  };
}

window.addEventListener('scroll', throttle(handleScroll, 100));

function debounce(func, delay) {
  let timeout;
  return function(...args) {
    clearTimeout(timeout);
    timeout = setTimeout(() => func.apply(this, args), delay);
  };
}

window.addEventListener('scroll', debounce(handleScroll, 100));

const element = document.getElementById('myElement');
const scrollTop = element.scrollTop;
const scrollLeft = element.scrollLeft;