首页 > 文章 > 前端

HTML如何开启图片懒加载提升性能

时间：2026-04-08 18:33:22 146浏览收藏

HTML图片懒加载看似只需添加`loading="lazy"`即可，实则暗藏诸多坑点：浏览器兼容性参差（尤其Safari旧版和微信X5内核完全不支持）、首屏关键图滥用懒加载易致白屏闪动、`srcset`/`sizes`语法错误会导致静默失效、框架中属性透传需特别处理、局部滚动容器更让原生懒加载彻底失灵——真正高性能的图片加载，从来不是加个属性就完事，而是需结合兼容性兜底、语义化标记、框架适配与自定义监听的系统性实践。

html怎么转loading lazy属性_HTML如何启用图片懒加载提升性能

img 标签加 `loading="lazy"` 就完事了？别急，先看浏览器支持

不是所有浏览器都认 loading="lazy" —— Chrome 76+、Edge 79+、Firefox 75+ 支持，Safari 直到 15.4 才开始部分支持（仅对，不支持 </code>）。老版本 Safari 或微信内置浏览器（X5 内核）直接忽略该属性，不报错也不生效。</p> <p>所以如果你的用户里还有 iOS 14 及更早设备，或者企业微信/钉钉内嵌页，<code>loading="lazy"</code> 就是摆设。得靠 JS 回退方案兜底，比如用 <code>IntersectionObserver</code> 手动监听进入视口再设置 <code>src</code>。</p> <h3>为什么 <code>loading="eager"</code> 有时反而更稳？</h3> <p>懒加载不是万能银弹。首屏关键图片（比如 banner、头像、商品主图）如果加了 <code>loading="lazy"</code>，在某些网络慢 + 渲染快的组合下，可能被浏览器判定为“非临界”，延迟加载导致白屏或闪动。</p> <p>这些场景建议显式写 <code>loading="eager"</code>：</p> <ul><li>首屏可见区域内的 <code><img></code>（尤其是 <code>width</code>/<code>height</code> 已固定、无 CSS 覆盖的）</li> <li>使用 <code>background-image</code> 的伪元素图片（<code>loading</code> 属性对它完全无效）</li> <li>通过 <code>object-fit: cover</code> 裁剪的关键图，懒加载后尺寸重排可能引发 layout shift</li> </ul><h3>和 <code>srcset</code>、<code>sizes</code> 搭配时，顺序和语法不能错</h3> <p><code>loading="lazy"</code> 必须和其他属性共存，但顺序无关紧要；真正容易出错的是 <code>srcset</code> 和 <code>sizes</code> 的值格式——一旦写错，懒加载会静默失效（浏览器回退到加载 <code>src</code>，但你可能根本没设 <code>src</code>）。</p> <p>常见错误：</p> <ul><li>漏写 <code>src</code>：有些同学以为 <code>srcset</code> 足够，结果在不支持 <code>srcset</code> 的旧环境或懒加载降级逻辑里直接 404</li> <li><code>sizes</code> 值里用了带单位的宽度（如 <code>"50vw"</code> 正确，<code>"50vw px"</code> 错误）</li> <li><code>srcset</code> 中图片路径含空格但没编码（<code>cat photo.jpg</code> → 应为 <code>cat%20photo.jpg</code>）</li> </ul><p>稳妥写法示例：<br></p><pre class="brush:php;toolbar:false"><img src="cat-small.jpg" srcset="cat-small.jpg 480w, cat-large.jpg 1024w" sizes="(max-width: 480px) 100vw, 50vw" loading="lazy" alt="cat"></pre> <h3>Vue/React 里动态生成 img，<code>loading</code> 属性可能被框架过滤</h3> <p>Vue 2 默认不识别 <code>loading</code> 这类非标准 HTML 属性，除非你用 <code>v-bind:</code> 显式绑定；React 则从 16+ 开始支持，但小写驼峰写法必须是 <code>loading</code>（不是 <code>loadingLazy</code> 或 <code>Loading</code>）。</p> <p>Vue 2 示例（需强制透传）：<br></p><pre class="brush:php;toolbar:false"><img v-bind:{"loading": "lazy"} :src="url" /></pre> <p>React 示例：<br></p><pre class="brush:php;toolbar:false"><img src={url} loading="lazy" alt="" /></pre> <p>另外注意：服务端渲染（SSR）时，如果 Node 环境的 React 版本低于 16.11，<code>loading</code> 属性不会被输出到 HTML 字符串里，首屏仍会全量加载。</p> <p>最麻烦的其实是「混合滚动容器」——比如一个 <code>div</code> 设置了 <code>overflow-y: auto</code>，里面塞了几十张图。这时 <code>loading="lazy"</code> 默认只对 viewport 生效，对这个局部滚动容器无效。真要懒，只能自己用 <code>IntersectionObserver</code> 监听目标容器的 <code>scrollTop</code> 和元素位置算偏移，没有捷径。</p><p>理论要掌握，实操不能落！以上关于《HTML如何开启图片懒加载提升性能》的详细介绍，大家都掌握了吧！如果想要继续提升自己的能力，那么就来关注golang学习网公众号吧！</p> <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">资料下载</div> </div> <ul class="classRecomList"> <li> <a href="https://pan.quark.cn/s/ba8ef670cabd" rel="nofollow" target="_blank" title="编程学习资料下载" class="img_box"> <img loading="lazy" src="/assets/images/xuexiziliao.jpeg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="编程学习资料下载"> </a> <dl> <dt class="lineOverflow"> <a href="https://pan.quark.cn/s/ba8ef670cabd" rel="nofollow" target="_blank" class="aBlack" title="编程学习资料下载">编程学习资料下载</a> </dt> <dd class="cont1 lineTwoOverflow"> 精选编程（Golang、Python、Java、C++、JavaScript等）教程、电子书与示例源码，一键打包本地下载学习。 </dd> <dd class="cont2"> <a href="https://pan.quark.cn/s/ba8ef670cabd" rel="nofollow" target="_blank" class="toStudy">立即下载</a> </dd> </dl> </li> </ul> </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>   |  11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>   |  2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>   |  2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>   |  1分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561270.html" title="CSS按钮点击过渡效果详解" class="aBlack">CSS按钮点击过渡效果详解</a></div> <div class="opt"> <span><i class="view"></i>291</span> <span class="collectBtn user_collection" data-id="561270" 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>   |  3分钟前  |   <a href="javascript:;" class="aLightGray" title="html5源代码发行">html5源代码发行</a> </div> <div class="tit lineOverflow"><a href="/article/561268.html" title="HTML5源代码报错怎么处理？常见错误解析与修复方法" class="aBlack">HTML5源代码报错怎么处理？常见错误解析与修复方法</a></div> <div class="opt"> <span><i class="view"></i>481</span> <span class="collectBtn user_collection" data-id="561268" 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>   |  10分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561260.html" title="JavaScript异步编程：Promise与Async/Await实战" class="aBlack">JavaScript异步编程：Promise与Async/Await实战</a></div> <div class="opt"> <span><i class="view"></i>106</span> <span class="collectBtn user_collection" data-id="561260" 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>   |  12分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561257.html" title="isSupersetOf 判断集合包含关系方法解析" class="aBlack">isSupersetOf 判断集合包含关系方法解析</a></div> <div class="opt"> <span><i class="view"></i>379</span> <span class="collectBtn user_collection" data-id="561257" 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>   |  18分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561249.html" title="Glitch部署HTML教程：轻松托管网页项目" class="aBlack">Glitch部署HTML教程：轻松托管网页项目</a></div> <div class="opt"> <span><i class="view"></i>276</span> <span class="collectBtn user_collection" data-id="561249" 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>   |  21分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561245.html" title="Vue生命周期钩子图解及执行顺序" class="aBlack">Vue生命周期钩子图解及执行顺序</a></div> <div class="opt"> <span><i class="view"></i>208</span> <span class="collectBtn user_collection" data-id="561245" 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>   |  21分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561244.html" title="CSS文本下划线动画实现方法" class="aBlack">CSS文本下划线动画实现方法</a></div> <div class="opt"> <span><i class="view"></i>275</span> <span class="collectBtn user_collection" data-id="561244" 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>   |  23分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561242.html" title="HTML5 Canvas导出图片太大怎么处理" class="aBlack">HTML5 Canvas导出图片太大怎么处理</a></div> <div class="opt"> <span><i class="view"></i>147</span> <span class="collectBtn user_collection" data-id="561242" 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>   |  24分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561240.html" title="HTML5视频被footer挤掉怎么解决" class="aBlack">HTML5视频被footer挤掉怎么解决</a></div> <div class="opt"> <span><i class="view"></i>424</span> <span class="collectBtn user_collection" data-id="561240" 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>   |  27分钟前  |   <a href="javascript:;" class="aLightGray" title="如何根据硬件选择合适的HTML函数工具">如何根据硬件选择合适的HTML函数工具</a> </div> <div class="tit lineOverflow"><a href="/article/561238.html" title="HTML工具查看硬件温度方法详解" class="aBlack">HTML工具查看硬件温度方法详解</a></div> <div class="opt"> <span><i class="view"></i>266</span> <span class="collectBtn user_collection" data-id="561238" 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>   |  36分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561228.html" title="WAI-ARIA 使用指南：避免误用与忽视" class="aBlack">WAI-ARIA 使用指南：避免误用与忽视</a></div> <div class="opt"> <span><i class="view"></i>257</span> <span class="collectBtn user_collection" data-id="561228" 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>   |  36分钟前  |   </div> <div class="tit lineOverflow"><a href="/article/561227.html" title="CSS flex与盒模型实现文字垂直居中方法" class="aBlack">CSS flex与盒模型实现文字垂直居中方法</a></div> <div class="opt"> <span><i class="view"></i>151</span> <span class="collectBtn user_collection" data-id="561227" 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 loading="lazy" 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 loading="lazy" 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 loading="lazy" 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 loading="lazy" 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 loading="lazy" 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> <script src="/assets/js/SyntaxHighlighter/shCore.js?3.1.1"></script> <script> document.addEventListener('DOMContentLoaded', function () { if (document.querySelector('.cont pre')) { SyntaxHighlighter.all(); } }); </script> </body> </html>

HTML如何开启图片懒加载提升性能

img 标签加 loading="lazy" 就完事了？别急，先看浏览器支持

img 标签加 `loading="lazy"` 就完事了？别急，先看浏览器支持