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ouncedHandleScroll); document.removeEventListener("DOMSubtreeModified", debouncedHandleScroll); } } // 创建防抖版本的滚动处理函数 const debouncedHandleScroll = debounce(handleScroll, 200); // 使用滚动事件实现懒加载（用于不支持IntersectionObserver的浏览器） function setupScrollBasedLazyLoad() { // 初始检查一次视口内的图片 handleScroll(); // 添加滚动事件监听（使用防抖） window.addEventListener("scroll", debouncedHandleScroll); // 添加调整窗口大小事件监听（使用防抖） window.addEventListener("resize", debouncedHandleScroll); // 监听DOM变化，处理父元素从display:none变为block的情况 document.addEventListener("DOMSubtreeModified", debouncedHandleScroll); // 使用MutationObserver监听DOM变化（如果浏览器支持） if (window.MutationObserver) { const mutationObserver = new MutationObserver(debouncedHandleScroll); mutationObserver.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); } } // 初始化函数 function init() { if (isIntersectionObserverSupported) { // 支持IntersectionObserver，使用懒加载 const lazyImages = document.querySelectorAll("img[lazy-src]"); lazyImages.forEach((img) => { observer.observe(img); }); } else { // 不支持IntersectionObserver，使用基于滚动事件的懒加载 setupScrollBasedLazyLoad(); } } // 当DOM加载完成后初始化 if (document.readyState === "loading") { document.addEventListener("DOMContentLoaded", init); } else { init(); } })();

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