原生懒加载

JS懒加载

const images = document.querySelectorAll('img[data-src]');
const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            entry.target.src = entry.target.dataset.src;
        }
    });
});
images.forEach(img => observer.observe(img));