44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
/* global KEEP */
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KEEP.initLazyLoad = () => {
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const imgs = document.querySelectorAll('img');
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let now = Date.now();
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let needLoad = true;
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function lazyload(imgs) {
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now = Date.now();
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needLoad = Array.from(imgs).some(i => i.hasAttribute('lazyload'));
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const h = window.innerHeight;
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const s = document.documentElement.scrollTop || document.body.scrollTop;
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imgs.forEach(img => {
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if (img.hasAttribute('lazyload') && !img.hasAttribute('loading')) {
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if ((h + s) > img.offsetTop) {
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img.setAttribute('loading', true);
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const loadImageTimeout = setTimeout(() => {
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const temp = new Image();
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const src = img.getAttribute('data-src');
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temp.src = src;
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temp.onload = () => {
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img.src = src;
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img.removeAttribute('lazyload');
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img.removeAttribute('loading');
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clearTimeout(loadImageTimeout);
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}
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}, 500);
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}
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}
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});
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}
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lazyload(imgs);
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window.onscroll = () => {
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if (Date.now() - now > 50 && needLoad) {
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lazyload(imgs);
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}
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}
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}
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