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zh-cn: update the content of the Why use dns-prefetch? section #16802

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Nov 2, 2023
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zh-cn: update the content of the Why use dns-prefetch? section #16802

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Update the content of the `Why use dns-prefetch?` section
codersjj Nov 2, 2023
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Update the content of the `Why use dns-prefetch?` section
codersjj Nov 2, 2023
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4 changes: 2 additions & 2 deletions files/zh-cn/web/performance/dns-prefetch/index.md
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Expand Up @@ -9,9 +9,9 @@ slug: Web/Performance/dns-prefetch

## 为什么要使用 dns-prefetch？

当浏览器从（第三方）服务器请求资源时，必须先将该[跨源](/zh-CN/docs/Web/HTTP/CORS)域名解析为 IP 地址，然后浏览器才能发出请求。此过程称为 DNS 解析。DNS 缓存可以帮助减少此延迟，而 DNS 解析可以导致请求增加明显的延迟。对于打开了与许多第三方的连接的网站，此延迟可能会大大降低加载性能。
当浏览器从（第三方）服务器请求资源时，必须先将该[跨源](/zh-CN/docs/Web/HTTP/CORS)域名解析为 IP 地址，然后浏览器才能发出请求。此过程称为 DNS 解析。虽然 DNS 缓存可以帮助减少此延迟，但 DNS 解析可能会给请求增加明显的延迟。对于打开了与许多第三方的连接的网站，此延迟可能会大大降低加载性能。

`dns-prefetch` 可帮助开发人员掩盖 DNS 解析延迟。[HTML `<link>` 元素](/zh-CN/docs/Web/HTML/Element/link)通过 `dns-prefetch` 的 [`rel` 属性](/zh-CN/docs/Web/HTML/Attributes/rel)值提供此功能。然后在 [href 属性](/zh-CN/docs/Web/HTML/Attributes)中指明要[跨源](/zh-CN/docs/Web/HTTP/CORS)的域名：
`dns-prefetch` 可帮助开发人员掩盖 DNS 解析延迟。[HTML `<link>` 元素](/zh-CN/docs/Web/HTML/Element/link)通过设置 [`rel` 属性](/zh-CN/docs/Web/HTML/Attributes/rel)值为 `dns-prefetch` 提供此功能。然后在 [href 属性](/zh-CN/docs/Web/HTML/Attributes)中指明要[跨源](/zh-CN/docs/Web/HTTP/CORS)的域名：

## 语法

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