Faster Webpage Loading

Preload subsequent pages and lazy load images to speed up webpage loading
当前为 2024-09-04 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Faster Webpage Loading
// @namespace    http://tampermonkey.net/
// @version      1.2
// @description  Preload subsequent pages and lazy load images to speed up webpage loading
// @author       tae
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Lazy load images
    document.addEventListener("DOMContentLoaded", function() {
        let lazyImages = [].slice.call(document.querySelectorAll("img.lazy"));
        if ("IntersectionObserver" in window) {
            let lazyImageObserver = new IntersectionObserver(function(entries, observer) {
                entries.forEach(function(entry) {
                    if (entry.isIntersecting) {
                        let lazyImage = entry.target;
                        lazyImage.src = lazyImage.dataset.src;
                        lazyImage.classList.remove("lazy");
                        lazyImageObserver.unobserve(lazyImage);
                    }
                });
            });

            lazyImages.forEach(function(lazyImage) {
                lazyImageObserver.observe(lazyImage);
            });
        } else {
            // Fallback for browsers without IntersectionObserver support
            let lazyLoad = function() {
                lazyImages.forEach(function(lazyImage) {
                    if (lazyImage.getBoundingClientRect().top < window.innerHeight && lazyImage.getBoundingClientRect().bottom > 0 && getComputedStyle(lazyImage).display !== "none") {
                        lazyImage.src = lazyImage.dataset.src;
                        lazyImage.classList.remove("lazy");
                    }
                });
                if (lazyImages.length === 0) {
                    document.removeEventListener("scroll", lazyLoad);
                    window.removeEventListener("resize", lazyLoad);
                    window.removeEventListener("orientationchange", lazyLoad);
                }
            };

            document.addEventListener("scroll", lazyLoad);
            window.addEventListener("resize", lazyLoad);
            window.addEventListener("orientationchange", lazyLoad);
        }
    });

    // Preload subsequent pages
    document.addEventListener("mouseover", function(event) {
        if (event.target.tagName === 'A' && event.target.href) {
            let link = event.target.href;
            let prefetchLink = document.createElement('link');
            prefetchLink.rel = 'prefetch';
            prefetchLink.href = link;
            document.head.appendChild(prefetchLink);
        }
    });
})();
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