Apply lazy loading to all images.
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// ==UserScript==
// @name Lazy Load Image
// @namespace lazy-load-image
// @version 2025-01-06
// @description Apply lazy loading to all images.
// @author Ace
// @run-at document-end
// @match *://*/*
// @icon https://cdn-icons-png.flaticon.com/512/13159/13159509.png
// @grant none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// Debug mode: Set to true to enable logs
const DEBUG = false;
// Debug logging function
const log = (...args) => {
if (DEBUG) {
console.log('[LazyLoadImage]', ...args);
}
};
log('Script started');
// Process existing images
document.querySelectorAll('img').forEach(img => {
if (!img.loading || img.loading !== 'lazy') {
img.loading = 'lazy';
log('Processed existing img:', img.src);
}
});
// Debouncing logic with requestAnimationFrame
let imgQueue = [];
let isScheduled = false;
const processQueue = () => {
log('Processing queued images:', imgQueue.length);
imgQueue.forEach(img => {
if (!img.loading || img.loading !== 'lazy') {
img.loading = 'lazy'; // Apply lazy loading
log('Applied lazy loading to new img:', img.src);
}
});
imgQueue = []; // Clear the queue
isScheduled = false; // Allow new frame scheduling
};
// Observe dynamically added images
const observer = new MutationObserver(mutations => {
mutations.forEach(mutation => {
mutation.addedNodes.forEach(node => {
if (node.nodeType === 1 && node.tagName === 'IMG') {
imgQueue.push(node); // Add image to the queue
log('New img detected:', node.src || 'No src');
}
});
});
// Schedule processing for the next frame if not already scheduled
if (!isScheduled && imgQueue.length > 0) {
isScheduled = true;
requestAnimationFrame(processQueue);
log('Scheduled processing for next frame');
}
});
// Start observing the DOM
observer.observe(document.body, { childList: true, subtree: true });
log('MutationObserver started');
})();