Enhanced Faster Webpage Loading with Pjax

Preload subsequent pages, lazy load images and videos, and use Pjax for faster webpage loading with robust error handling and fallback navigation.
当前为 2025-01-02 提交的版本，查看最新版本。
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// ==UserScript==
// @name         Enhanced Faster Webpage Loading with Pjax
// @namespace    http://tampermonkey.net/
// @version      1.9
// @description  Preload subsequent pages, lazy load images and videos, and use Pjax for faster webpage loading with robust error handling and fallback navigation.
// @author       Tae
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    // Lazy load images, videos, and multimedia
    document.addEventListener("DOMContentLoaded", () => {
        const lazyElements = Array.from(document.querySelectorAll("img.lazy, video.lazy, iframe.lazy"));

        function loadLazyElement(el) {
            const dataSrc = el.dataset.src;
            if (!dataSrc) return;

            el.src = dataSrc;
            if (el.tagName === "VIDEO") {
                el.load();
            }
            el.classList.remove("lazy");
        }

        if ("IntersectionObserver" in window) {
            const observer = new IntersectionObserver((entries, observer) => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        loadLazyElement(entry.target);
                        observer.unobserve(entry.target);
                    }
                });
            });

            lazyElements.forEach(el => observer.observe(el));
        } else {
            const lazyLoadFallback = () => {
                lazyElements.forEach((el, index) => {
                    if (
                        el.getBoundingClientRect().top < window.innerHeight &&
                        el.getBoundingClientRect().bottom > 0 &&
                        getComputedStyle(el).display !== "none"
                    ) {
                        loadLazyElement(el);
                        lazyElements.splice(index, 1); // Remove loaded element
                    }
                });
                if (lazyElements.length === 0) {
                    document.removeEventListener("scroll", lazyLoadFallback);
                    window.removeEventListener("resize", lazyLoadFallback);
                    window.removeEventListener("orientationchange", lazyLoadFallback);
                }
            };
            document.addEventListener("scroll", lazyLoadFallback);
            window.addEventListener("resize", lazyLoadFallback);
            window.addEventListener("orientationchange", lazyLoadFallback);
        }
    });

    // Prefetch links
    document.addEventListener("mouseover", event => {
        const link = event.target.closest("a[href]");
        if (link && !link.target && !link.rel.includes("nofollow")) {
            const href = link.href;
            if (/^https?:\/\//.test(href) && !href.includes("#")) {
                const prefetch = document.createElement("link");
                prefetch.rel = "prefetch";
                prefetch.href = href;
                document.head.appendChild(prefetch);
            }
        }
    });

    // Initialize Pjax
    function initializePjax() {
        if (typeof Pjax === "undefined") {
            const script = document.createElement("script");
            script.src = "https://cdnjs.cloudflare.com/ajax/libs/pjax/0.2.8/pjax.min.js";
            script.onload = () => setupPjax();
            document.head.appendChild(script);
        } else {
            setupPjax();
        }
    }

    function setupPjax() {
        const pjax = new Pjax({
            elements: "a[href]:not([target]):not([data-pjax-disabled])", // Only internal links
            selectors: ["title", ".content"], // Elements to update
            cacheBust: true, // Force cache refresh
        });

        document.addEventListener("pjax:send", () => console.log("Pjax: Request sent"));
        document.addEventListener("pjax:complete", () => {
            console.log("Pjax: Request complete");
            reinitializeLazyLoading();
        });
        document.addEventListener("pjax:error", event => {
            console.error("Pjax: Error occurred", event);
            // Fallback to normal navigation
            window.location.href = event.request.responseURL || event.target.href;
        });
    }

    function reinitializeLazyLoading() {
        const newLazyElements = Array.from(document.querySelectorAll("img.lazy, video.lazy, iframe.lazy:not([src])"));
        if ("IntersectionObserver" in window) {
            const observer = new IntersectionObserver((entries, observer) => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        const el = entry.target;
                        el.src = el.dataset.src;
                        if (el.tagName === "VIDEO") el.load();
                        observer.unobserve(el);
                    }
                });
            });

            newLazyElements.forEach(el => observer.observe(el));
        }
    }

    // Initialize the script
    initializePjax();
})();
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