Comments (3)
creeperyang
commented on September 17, 2024
具体的关于优化的知识点或问题
1. 为什么网页设置缓存后仍然有请求（304响应）？
浏览器刷新是conditional request，所以如果通过刷新来看缓存是否有效肯定是304。可以试试输入网址按回车或者回退键来看效果。另外由于HTML文档很少设置完全缓存（一般要和服务器验证），可以看静态组件的缓存效果（200 ok (from cache)）。
2. expirationTime = responseTime + freshnessLifetime - currentAge
freshnessLifetime具体怎么算可以参考https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching_FAQ。
3. Flash of unstyled content（无样式内容闪烁）
Flash of unstyled content（FOUC）就是在加载外部样式表之前，浏览器按默认样式显示了内容，这是因为浏览器在所有资源都下载好前就开始渲染页面了。一旦外部样式被加载，浏览器就会修正样式，但这种修正可能是可见的，也就是FOUC。
怎么避免？在<head>中通过<link>引入样式，避免使用@import。
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duduGao
commented on September 17, 2024
good
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maskhb
commented on September 17, 2024
学习了，感谢翻译 有些翻译还是比较生硬啊
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