首页 > 文章 > 前端

HTML5元素过多如何优化？懒加载解决方案

时间：2026-01-09 08:12:34 384浏览收藏

欢迎各位小伙伴来到golang学习网，相聚于此都是缘哈哈哈！今天我给大家带来《HTML5元素太多怎么处理_懒加载解决方案》，这篇文章主要讲到等等知识，如果你对文章相关的知识非常感兴趣或者正在自学，都可以关注我，我会持续更新相关文章！当然，有什么建议也欢迎在评论留言提出！一起学习！

懒加载是HTML5页面刚需，应优先用IntersectionObserver实现，并配loading="lazy"降级；对img/iframe用data-src，广告位需防伪懒加载，禁用自动发现并延迟加载SDK。

HTML5页面元素过多怎么办_HTML5组件懒加载方案【教程】

页面卡顿、首屏加载慢，大概率是元素没做懒加载

HTML5 页面里塞了几十个、</code> 或自定义组件，但用户只看首屏，其余内容却在页面初始化时就全部解析、渲染、请求资源——这是典型「过度加载」。直接后果：首屏时间拉长、内存占用飙升、低端设备卡死。懒加载不是锦上添花，而是现代 HTML5 页面的刚需。</p> <h3><code>IntersectionObserver</code> 是当前最稳妥的懒加载实现方式</h3> <p>比起监听 <code>scroll</code> + <code>getBoundingClientRect()</code> 的老方案，<code>IntersectionObserver</code> 由浏览器原生调度，不触发重排重绘，性能开销极低，且能准确感知元素是否进入视口（包括 <code>overflow: scroll</code> 容器内）。它已全平台支持（Chrome 51+、Firefox 55+、Safari 12.1+、Edge 79+）。</p> <p>实操建议：</p> <ul><li>对所有非首屏 <code><img></code>，把 <code>src</code> 挪到 <code>data-src</code>，用 <code>IntersectionObserver</code> 监听后赋值回 <code>src</code></li> <li>对 <code><iframe></code>，同样用 <code>data-src</code> 存真实地址，进入视口后再设 <code>src</code>，避免提前加载第三方脚本</li> <li>对自定义 Web Component 或 Vue/React 组件，可在 <code>observedCallback</code> 或 <code>useEffect</code> 中触发初始化逻辑，而非挂载即执行</li> <li>设置 <code>rootMargin: '0px 0px 200px 0px'</code> 提前加载，避免滚动过快时出现空白</li> </ul><h3>图片懒加载必须配 <code>loading="lazy"</code> 作为降级兜底</h3> <p><code>loading="lazy"</code> 是 HTML 原生属性，对 <code><img></code> 和 <code><iframe></code> 有效，无需 JS 即可启用基础懒加载。但它有明确限制：仅对非 CSS 背景图、非 <code>display: none</code> 元素生效；Safari 15.4+ 才支持 <code><iframe></code>；部分安卓 WebView 不识别。</p> <p>所以正确姿势是：</p> <ul><li>所有 <code><img></code> 都加上 <code>loading="lazy"</code>，哪怕你已用 <code>IntersectionObserver</code></li> <li>同时保留 <code>data-src</code> 和 JS 初始化逻辑——当浏览器不支持 <code>loading="lazy"</code> 时，JS 方案自动接管</li> <li>不要依赖它单独工作：它无法控制加载时机精度，也不支持自定义占位、错误重试、多图批量加载等场景</li> </ul><h3>第三方组件或广告位懒加载要防「伪懒加载」</h3> <p>很多广告 SDK 或统计脚本会主动扫描 DOM，一看到 <code><div class="ad-banner"></code> 就立刻发起请求，哪怕你把它藏在折叠面板里。这种「伪懒加载」会让懒加载完全失效。</p> <p>关键应对点：</p> <ul><li>禁用自动发现：给广告容器加 <code>data-ad-status="pending"</code>，只在 <code>IntersectionObserver</code> 触发后才改 <code>data-ad-status="ready"</code>，并在 JS 中显式调用 <code>adSDK.render(el)</code></li> <li>延迟加载 SDK：不要在 <code><head></code> 中预加载广告 JS，改用 <code>import('./ad-sdk.js')</code> 动态导入，且仅在首次观测到广告位时触发</li> <li>避免内联脚本：把广告初始化逻辑从 <code><script></code> 标签中抽离，统一由懒加载控制器调度</li> <li>检查第三方是否读取 <code>offsetParent</code> 或 <code>offsetHeight</code>：这类读取会强制触发 layout，破坏懒加载节奏，必要时用 <code>getBoundingClientRect()</code> 替代</li> </ul><p>真正起效的懒加载，从来不是加个属性或套个库就完事。它需要你清楚每个元素的加载动机、资源依赖和执行副作用——尤其是那些你以为“只是个 div”的第三方占位符。</p><p>今天关于《HTML5元素过多如何优化？懒加载解决方案》的内容就介绍到这里了，是不是学起来一目了然！想要了解更多关于的内容请关注golang学习网公众号！</p> <div style="margin:16px auto;width:100%;max-width:720px;box-sizing:border-box;padding:16px;border:1px solid #e5e7eb;border-radius:12px;background:#fff;box-shadow:0 6px 24px rgba(16,24,40,0.08);text-align:center;overflow:hidden;"> <a onclick="showThirdParty('flex')" style="display:inline-flex;width:100%;max-width:100%;justify-content:center;align-items:center;gap:8px;padding:12px 18px;border-radius:10px;background:#2d8cf0;color:#fff;text-decoration:none;font-weight:600;box-sizing:border-box;overflow-wrap:anywhere;word-break:break-word;"> 前往漫画官网入口并下载 ➜ </a> </div> <div id="third-party-overlay" style="position:fixed;left:0;top:0;width:100%;height:100%;display:none;justify-content:center;align-items:center;background:rgba(0,0,0,0.4);z-index:9999;"> <div style="background:#FFF3CD;border:1px solid #FFEEBA;padding:16px;border-radius:6px;box-sizing:border-box;max-width:480px;width:90%;text-align:center;"> <div style="font-size:14px;color:#856404;margin-bottom:12px;">您即将跳转至第三方网站，请注意保护好个人信息和财产安全！</div> <a href="https://comicdow.pdlcomic.top/1273%2F%E5%9B%A7%E6%AC%A1%E5%85%83.apk" target="_blank" rel="nofollow noopener noreferrer" style="color:#2d8cf0;text-decoration:none;" onclick="showThirdParty('none');">继续访问</a> </div> </div> <script> function showThirdParty(mode){ var el = document.getElementById('third-party-overlay'); if (!el) return; el.style.display = (mode === 'none' ? 'none' : 'flex'); } </script> </div> <div class="labsList"> </div> </div>  <div class="contBoxNor"> <div class="contTit"> <div class="tit">相关阅读</div> <a href="/articlelist.html" class="more">更多></a> </div> <ul class="latestReadList"> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  8个月前  |   <a href="javascript:;" class="aLightGray" title="提升">提升</a> <a href="javascript:;" class="aLightGray" title="箭头函数">箭头函数</a> <a href="javascript:;" class="aLightGray" title="函数表达式">函数表达式</a> <a href="javascript:;" class="aLightGray" title="函数声明">函数声明</a> <a href="javascript:;" class="aLightGray" title="Function构造函数">Function构造函数</a> </div> <div class="tit lineOverflow"><a href="/article/207000.html" title="JavaScript函数定义及示例详解" class="aBlack">JavaScript函数定义及示例详解</a></div> <div class="opt"> <span><i class="view"></i>502</span> <span class="collectBtn user_collection" data-id="207000" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2年前  |   <a href="javascript:;" class="aLightGray" title="CSS">CSS</a> <a href="javascript:;" class="aLightGray" title="优化">优化</a> <a href="javascript:;" class="aLightGray" title="体验">体验</a> </div> <div class="tit lineOverflow"><a href="/article/72840.html" title="优化用户界面体验的秘密武器：CSS开发项目经验大揭秘" class="aBlack">优化用户界面体验的秘密武器：CSS开发项目经验大揭秘</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="72840" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2年前  |   <a href="javascript:;" class="aLightGray" title="图片轮播">图片轮播</a> <a href="javascript:;" class="aLightGray" title="微信小程序">微信小程序</a> <a href="javascript:;" class="aLightGray" title="特效">特效</a> </div> <div class="tit lineOverflow"><a href="/article/76259.html" title="使用微信小程序实现图片轮播特效" class="aBlack">使用微信小程序实现图片轮播特效</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="76259" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  1年前  |   <a href="javascript:;" class="aLightGray" title="sessionStorage">sessionStorage</a> <a href="javascript:;" class="aLightGray" title="存储能力">存储能力</a> <a href="javascript:;" class="aLightGray" title="限制解析">限制解析</a> </div> <div class="tit lineOverflow"><a href="/article/83771.html" title="解析sessionStorage的存储能力与限制" class="aBlack">解析sessionStorage的存储能力与限制</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="83771" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  1年前  |   <a href="javascript:;" class="aLightGray" title="团队合作">团队合作</a> <a href="javascript:;" class="aLightGray" title="冒泡事件">冒泡事件</a> <a href="javascript:;" class="aLightGray" title="促进作用">促进作用</a> </div> <div class="tit lineOverflow"><a href="/article/85057.html" title="探索冒泡活动对于团队合作的推动力" class="aBlack">探索冒泡活动对于团队合作的推动力</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="85057" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> </ul> </div>  <div class="contBoxNor"> <div class="contTit"> <div class="tit">最新阅读</div> <a href="/articlelist.html" class="more">更多></a> </div> <ul class="latestReadList"> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452310.html" title="JavaScript手势识别与触摸监听技巧" class="aBlack">JavaScript手势识别与触摸监听技巧</a></div> <div class="opt"> <span><i class="view"></i>310</span> <span class="collectBtn user_collection" data-id="452310" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452309.html" title="CSSFlex嵌套错位怎么解决？" class="aBlack">CSSFlex嵌套错位怎么解决？</a></div> <div class="opt"> <span><i class="view"></i>300</span> <span class="collectBtn user_collection" data-id="452309" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452303.html" title="CSS字体不显示怎么解决？" class="aBlack">CSS字体不显示怎么解决？</a></div> <div class="opt"> <span><i class="view"></i>346</span> <span class="collectBtn user_collection" data-id="452303" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452300.html" title="HTML/CSS标题水平居中技巧" class="aBlack">HTML/CSS标题水平居中技巧</a></div> <div class="opt"> <span><i class="view"></i>349</span> <span class="collectBtn user_collection" data-id="452300" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452299.html" title="CSS路径配置技巧与加载问题解决" class="aBlack">CSS路径配置技巧与加载问题解决</a></div> <div class="opt"> <span><i class="view"></i>221</span> <span class="collectBtn user_collection" data-id="452299" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452296.html" title="JavaScript单例模式实现方法详解" class="aBlack">JavaScript单例模式实现方法详解</a></div> <div class="opt"> <span><i class="view"></i>273</span> <span class="collectBtn user_collection" data-id="452296" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452295.html" title="JS获取子节点列表的几种方法" class="aBlack">JS获取子节点列表的几种方法</a></div> <div class="opt"> <span><i class="view"></i>188</span> <span class="collectBtn user_collection" data-id="452295" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   <a href="javascript:;" class="aLightGray" title="js如何使用教程">js如何使用教程</a> </div> <div class="tit lineOverflow"><a href="/article/452290.html" title="JS字符串截取：substringslicesubstr区别详解" class="aBlack">JS字符串截取：substringslicesubstr区别详解</a></div> <div class="opt"> <span><i class="view"></i>199</span> <span class="collectBtn user_collection" data-id="452290" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452289.html" title="Flexbox换行排列优化方法解析" class="aBlack">Flexbox换行排列优化方法解析</a></div> <div class="opt"> <span><i class="view"></i>415</span> <span class="collectBtn user_collection" data-id="452289" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452280.html" title="JS防抖函数怎么实现？" class="aBlack">JS防抖函数怎么实现？</a></div> <div class="opt"> <span><i class="view"></i>155</span> <span class="collectBtn user_collection" data-id="452280" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452279.html" title="动态规划详解及JS实现方法" class="aBlack">动态规划详解及JS实现方法</a></div> <div class="opt"> <span><i class="view"></i>217</span> <span class="collectBtn user_collection" data-id="452279" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  2小时前  |   </div> <div class="tit lineOverflow"><a href="/article/452276.html" title="JavaScript本地存储：cookie与localStorage怎么选" class="aBlack">JavaScript本地存储：cookie与localStorage怎么选</a></div> <div class="opt"> <span><i class="view"></i>334</span> <span class="collectBtn user_collection" data-id="452276" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> </ul> </div>  <div class="contBoxNor"> <div class="contTit"> <div class="tit">课程推荐</div> <a href="/courselist.html" class="more">更多></a> </div> <ul class="classRecomList"> <li> <a href="/course/9.html" title="前端进阶之JavaScript设计模式" class="img_box"> <img src="/uploads/20221222/52fd0f23a454c71029c2c72d206ed815.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="前端进阶之JavaScript设计模式"> </a> <dl> <dt class="lineOverflow"> 前端进阶之JavaScript设计模式 </dt> <dd class="cont1 lineOverflow">设计模式是开发人员在软件开发过程中面临一般问题时的解决方案，代表了最佳的实践。本课程的主打内容包括JS常见设计模式以及具体应用场景，打造一站式知识长龙服务，适合有JS基础的同学学习。</dd> <dd class="cont2"> <a href="/course/9.html" title="前端进阶之JavaScript设计模式" class="toStudy">立即学习</a> <span>543次学习</span> </dd> </dl> </li> <li> <a href="/course/2.html" title="GO语言核心编程课程" class="img_box"> <img src="/uploads/20221221/634ad7404159bfefc6a54a564d437b5f.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="GO语言核心编程课程"> </a> <dl> <dt class="lineOverflow"> GO语言核心编程课程 </dt> <dd class="cont1 lineOverflow">本课程采用真实案例，全面具体可落地，从理论到实践，一步一步将GO核心编程技术、编程思想、底层实现融会贯通，使学习者贴近时代脉搏，做IT互联网时代的弄潮儿。</dd> <dd class="cont2"> <a href="/course/2.html" title="GO语言核心编程课程" class="toStudy">立即学习</a> <span>516次学习</span> </dd> </dl> </li> <li> <a href="/course/74.html" title="简单聊聊mysql8与网络通信" class="img_box"> <img src="/uploads/20240103/bad35fe14edbd214bee16f88343ac57c.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="简单聊聊mysql8与网络通信"> </a> <dl> <dt class="lineOverflow"> 简单聊聊mysql8与网络通信 </dt> <dd class="cont1 lineOverflow">如有问题加微信：Le-studyg；在课程中，我们将首先介绍MySQL8的新特性，包括性能优化、安全增强、新数据类型等，帮助学生快速熟悉MySQL8的最新功能。接着，我们将深入解析MySQL的网络通信机制，包括协议、连接管理、数据传输等，让</dd> <dd class="cont2"> <a href="/course/74.html" title="简单聊聊mysql8与网络通信" class="toStudy">立即学习</a> <span>500次学习</span> </dd> </dl> </li> <li> <a href="/course/57.html" title="JavaScript正则表达式基础与实战" class="img_box"> <img src="/uploads/20221226/bbe4083bb3cb0dd135fb02c31c3785fb.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="JavaScript正则表达式基础与实战"> </a> <dl> <dt class="lineOverflow"> JavaScript正则表达式基础与实战 </dt> <dd class="cont1 lineOverflow">在任何一门编程语言中,正则表达式,都是一项重要的知识,它提供了高效的字符串匹配与捕获机制,可以极大的简化程序设计。</dd> <dd class="cont2"> <a href="/course/57.html" title="JavaScript正则表达式基础与实战" class="toStudy">立即学习</a> <span>487次学习</span> </dd> </dl> </li> <li> <a href="/course/28.html" title="从零制作响应式网站—Grid布局" class="img_box"> <img src="/uploads/20221223/ac110f88206daeab6c0cf38ebf5fe9ed.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="从零制作响应式网站—Grid布局"> </a> <dl> <dt class="lineOverflow"> 从零制作响应式网站—Grid布局 </dt> <dd class="cont1 lineOverflow">本系列教程将展示从零制作一个假想的网络科技公司官网，分为导航，轮播，关于我们，成功案例，服务流程，团队介绍，数据部分，公司动态，底部信息等内容区块。网站整体采用CSSGrid布局，支持响应式，有流畅过渡和展现动画。</dd> <dd class="cont2"> <a href="/course/28.html" title="从零制作响应式网站—Grid布局" class="toStudy">立即学习</a> <span>485次学习</span> </dd> </dl> </li> </ul> </div> </div>  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet"> <div class="footer"> <ul> <li ><a href="/" class="aLightGray"><em class="material-icons">home</em><span>首页</span></a></li> <li class="curr"><a href="/articlelist.html" class="aLightGray"><em class="material-icons">menu_book</em><span>阅读</span></a></li> <li ><a href="/courselist.html" class="aLightGray"><em class="material-icons">school</em><span>课程</span></a></li> <li ><a href="/ai.html" class="aLightGray"><em class="material-icons">smart_toy</em><span>AI助手</span></a></li> <li ><a href="/user.html" class="aLightGray"><em class="material-icons">person</em><span>我的</span></a></li> </ul> </div> <script src="/assets/js/require.js" data-main="/assets/js/require-frontend.js?v=1671101972"></script> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?3dc5666f6478c7bf39cd5c91e597423d"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> </body> </html>