Optimize non-first screen CSS and image lazy loading, hardware acceleration, script lazy loading, code splitting, caching strategy, event throttling, and more.
当前为
// ==UserScript==
// @name Web Comprehensive Optimization Script（web综合优化脚本）
// @namespace http://tampermonkey.net/
// @version 2.3
// @description Optimize non-first screen CSS and image lazy loading, hardware acceleration, script lazy loading, code splitting, caching strategy, event throttling, and more.
// @author KiwiFruit
// @match *://*/*
// @grant none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// 定义 calculateRootMargin 在最前面
const calculateRootMargin = () => {
const windowHeight = window.innerHeight;
const marginBottom = Math.max(0, windowHeight * 0.1); // 例如，取窗口高度的10%
return `0px 0px ${marginBottom}px 0px`;
};
// 模块：加载外部资源
const loadResource = (url, type) => new Promise((resolve, reject) => {
const element = document.createElement(type === 'script' ? 'script' : 'link');
if (type === 'script') {
element.src = url;
} else {
element.rel = 'stylesheet';
element.href = url;
}
element.onload = resolve;
element.onerror = () => reject(new Error(`${type} loading failed: ${url}`));
document.head.appendChild(element);
});
const loadScript = url => loadResource(url, 'script');
const loadStylesheet = href => loadResource(href, 'stylesheet');
// 模块：硬件加速
const initHardwareAcceleration = () => {
const className = 'enable-hardware-acceleration';
const styleSheet = `
.${className} {
transform: translateZ(0) !important;
will-change: transform !important;
}`;
const styleElement = document.createElement('style');
styleElement.type = 'text/css';
styleElement.appendChild(document.createTextNode(styleSheet));
document.head.appendChild(styleElement);
const observer = new IntersectionObserver((entries) => {
entries.forEach(entry => {
if (entry.isIntersecting) {
entry.target.classList.add(className);
} else {
entry.target.classList.remove(className);
}
});
}, { rootMargin: calculateRootMargin(), threshold: 0 });
return { observer };
};
// 模块：懒加载
const initializeImageLazyLoading = async () => {
const scriptUrl = 'https://cdnjs.cloudflare.com/ajax/libs/lozad.js/1.15.0/lozad.min.js';
await loadScript(scriptUrl);
if (typeof window.lozad === 'function') {
const observer = window.lozad();
observer.observe();
} else {
console.error('Lozad.js failed to load or did not expose the expected global function.');
}
};
const initializeNonFirstScreenCssLazyLoading = async () => {
document.querySelectorAll('.lazy-css').forEach(async (element) => {
const href = element.getAttribute('data-lazy-css');
if (href) {
try {
await loadStylesheet(href);
element.parentElement.removeChild(element);
} catch (error) {
console.error('Failed to load lazy CSS:', error);
}
}
});
};
// 初始化示例
const initialize = async () => {
if (!window.IntersectionObserver || !window.ResizeObserver) {
console.warn('Your browser does not support some required features.');
return;
}
// 确保首屏所需的CSS资源被优先加载
const criticalCssUrls = [
'https://example.com/style1.css',
'https://example.com/style2.css'
];
criticalCssUrls.forEach(href => loadStylesheet(href));
// 初始化其他模块
initHardwareAcceleration();
await initializeImageLazyLoading();
await initializeNonFirstScreenCssLazyLoading();
// 监听 DOM 变化
const mutationObserver = new MutationObserver(mutations => {
mutations.forEach(mutation => {
mutation.addedNodes.forEach(node => {
if (node.nodeType === 1) {
if (node.tagName === 'IMG' && node.hasAttribute('data-src')) {
const observer = new IntersectionObserver((entries) => {
entries.forEach(entry => {
if (entry.isIntersecting) {
node.src = node.getAttribute('data-src');
observer.unobserve(node);
}
});
}, { rootMargin: calculateRootMargin(), threshold: 0 });
observer.observe(node);
} else if (node.classList.contains('lazy-css') && node.hasAttribute('data-lazy-css')) {
const href = node.getAttribute('data-lazy-css');
loadStylesheet(href)
.then(() => node.parentElement.removeChild(node))
.catch(error => console.error('Failed to load lazy CSS:', error));
}
}
});
});
});
mutationObserver.observe(document.body, { childList: true, subtree: true });
};
// 页面加载完成后初始化
document.addEventListener("DOMContentLoaded", () => {
initialize().catch(console.error);
});
})();