<div id="parent" style="padding-top: 100vh;">
data-src="https://www.baidu.com/img/baidu_jgylogo3.gif"
data-src="https://www.baidu.com/img/baidu_jgylogo3.gif"
style="margin-top:100vh;"
const observer = new IntersectionObserver((entries, observer) => {
if (entries.length < 1) {
entries.forEach((entry) => {
if (entry.isIntersecting) {
const target = entry.target;
observer.unobserve(target);
target.src = target.dataset.src;
const $imgs = document.querySelectorAll("img");
$imgs.forEach((item) => {