什么是CDN首码，它如何优化网站性能？

CDN首码通常指的是在域名系统中，为了实现内容分发网络（CDN）的加速效果，而对原始域名进行的一种特定前缀或标识的添加。这种首码有助于将用户请求导向最近的CDN节点，从而提高访问速度和稳定性。具体的首码形式可能因不同的CDN服务提供商而异，但常见的有“cdn.”、“static.”、“cache.”等。通过在域名前添加这些首码，可以将用户的请求重定向到CDN网络中的相应节点，从而实现内容的快速加载和传输。

CDN首码

CDN（内容分发网络）是用于加速网站资源加载速度的技术，通过将内容缓存在全球多个节点上，使用户可以从最近的服务器获取数据，以下是一些著名的免费CDN服务：

名称	官网	简介
cdnjs.com	[https://www.cdnjs.com](https://www.cdnjs.com)	全球最著名开源CDN库，使用Cloudflare分发。
字节跳动CDN	[https://cdn.bytedance.com](https://cdn.bytedance.com)	字节跳动出品的公共库，同步自cdnjs.com。
jsDelivr	[https://www.jsdelivr.com](https://www.jsdelivr.com)	免费开源CDN解决方案，包含JavaScript库、jQuery插件等。
UNPKG	[https://unpkg.com](https://unpkg.com)	快速的内容交付网络，支持npm中所有内容。
BootCDN	[https://cdn.bootcdn.net](https://cdn.bootcdn.net)	极兔云联合Bootstrap中文网共同维护的前端开源项目免费CDN服务。
75CDN	[https://baomitu.com/cdn/](https://baomitu.com)	由360前端奇舞团支持，收录了上千个前端资源库。
Staticfile CDN	[https://staticfile.org/](https://staticfile.org)	快速全球内容交付网络，使用类似URL轻松加载任何文件。

这些CDN服务通过将静态资源缓存到全球多个节点，提高了网站的响应速度和用户体验，如果你在开发个人网站或应用，可以考虑使用上述免费CDN服务来提升性能。

序号 CDN首码（Content Delivery Network，内容分发网络）描述

1 CDN首码是指在使用内容分发网络时，首先被加载的代码或资源，这通常是HTML文档中的，如</code>标签、<code><meta></code>标签、<code><link></code>标签（用于CSS文件）等。</td> </tr> <tr> <td> 2</td> <td> CDN首码的加载时间对整个页面的加载速度有很大影响，因为它是用户首先看到的页面内容。</td> </tr> <tr> <td> 3</td> <td> 优化CDN首码的加载时间可以通过减少HTTP请求、压缩资源、使用缓存策略等方法实现。</td> </tr> <tr> <td> 4</td> <td> CDN首码通常包括：页面标题（<code><title></code>）、字符编码声明（<code><meta charset="UTF8"></code>）、视口设置（<code><meta name="viewport"></code>）、CSS链接、JavaScript链接等。</td> </tr> <tr> <td> 5</td> <td> 在网页设计时，应确保CDN首码中的资源尽可能少，并且这些资源是页面显示的必要部分。</td> </tr> </tbody> </table> <div class="entry-copyright"><p>原创文章，作者：未希，如若转载，请注明出处：https://www.kdun.com/ask/1221197.html</p></div> </div> <div class="entry-tag"><a href="https://www.kdun.com/ask/tag/cdn%e9%a6%96%e7%a0%81" rel="tag">CDN首码</a><a href="https://www.kdun.com/ask/tag/%e5%86%85%e5%ae%b9%e5%88%86%e5%8f%91" rel="tag">内容分发</a><a href="https://www.kdun.com/ask/tag/%e7%bd%91%e7%ab%99%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96" rel="tag">网站性能优化</a></div> <div class="entry-action"> 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