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Cisco 2960X vs 2960XR: Which Switch is Best for Your Network in 2025?

By Network Switches on 20 באפר׳ 2025

Table of content 1. Cisco Catalyst 2960X and 2960XR Series Overview 2. Comparison Between Cisco Catalyst 2960X and 2960XR Series 3. Customer Feedback and Satisfaction 4. Real-World Examples and Use Cases 5. ...

// 优化的懒加载脚本 - 添加到theme.liquid底部或单独的JS文件中 (function() { 'use strict'; // 检查浏览器是否支持原生懒加载 const supportsNativeLazyLoading = 'loading' in HTMLImageElement.prototype; // 如果支持原生懒加载，使用原生功能 if (supportsNativeLazyLoading) { const images = document.querySelectorAll('img[data-src]'); images.forEach(img => { img.src = img.dataset.src; if (img.dataset.srcset) { img.srcset = img.dataset.srcset; } img.classList.add('loaded'); // 移除懒加载类 img.classList.remove('lazyloadt4s'); }); return; } // Intersection Observer 懒加载实现 const imageObserver = new IntersectionObserver((entries, observer) => { entries.forEach(entry => { if (entry.isIntersecting) { const img = entry.target; // 加载图片 if (img.dataset.src) { img.src = img.dataset.src; } if (img.dataset.srcset) { img.srcset = img.dataset.srcset; } // 添加加载完成的类 img.onload = () => { img.classList.add('loaded'); img.classList.remove('lazyloadt4s'); // 移除加载器 const loader = img.nextElementSibling; if (loader && loader.classList.contains('lazyloadt4s-loader')) { loader.style.display = 'none'; } }; // 停止观察该图片 observer.unobserve(img); } }); }, { // 提前100px开始加载 rootMargin: '100px 0px', threshold: 0.01 }); // 观察所有懒加载图片 function observeImages() { const lazyImages = document.querySelectorAll('img.lazyloadt4s[data-src]'); lazyImages.forEach(img => { imageObserver.observe(img); }); } // DOM加载完成后开始观察 if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', observeImages); } else { observeImages(); } // 处理动态添加的图片（如AJAX加载的内容） const mutationObserver = new MutationObserver((mutations) => { mutations.forEach((mutation) => { if (mutation.type === 'childList') { mutation.addedNodes.forEach((node) => { if (node.nodeType === 1) { // Element node const lazyImages = node.querySelectorAll ? node.querySelectorAll('img.lazyloadt4s[data-src]') : []; lazyImages.forEach(img => { imageObserver.observe(img); }); } }); } }); }); mutationObserver.observe(document.body, { childList: true, subtree: true }); })(); // 预加载关键图片的函数 function preloadCriticalImages() { // 预加载下一篇文章的图片（如果存在） const nextArticleLinks = document.querySelectorAll('a[href*="/blogs/"]'); if (nextArticleLinks.length > 0) { // 在用户滚动到页面底部时预加载 let preloadTriggered = false; window.addEventListener('scroll', function() { if (!preloadTriggered && window.innerHeight + window.scrollY >= document.body.offsetHeight * 0.8) { preloadTriggered = true; // 这里可以添加预加载下一篇文章图片的逻辑 console.log('预加载下一篇文章资源'); } }, { passive: true }); } } // 页面加载完成后执行预加载 window.addEventListener('load', preloadCriticalImages);

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