js编写一个 loadMorecontainer callback 函数要求传入container 滚动容器 选择器callback 回调函数监听容器滚动到底部执行callback

function loadMore(container, callback) { const el = document.querySelector(container); el.addEventListener('scroll', () => { const scrollHeight = el.scrollHeight; const scrollTop = el.scrollTop; const clientHeight = el.clientHeight; if (scrollHeight - scrollTop === clientHeight) { callback(); } }); }