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前端缓存机制
source link: https://juejin.im/post/5b0ea4f1518825155d66a97b
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浏览器缓存步骤 1）浏览器在加载资源时，先根据这个资源的一些http header判断它是否命中强缓存，强缓存如果命中，浏览器直接从自己的缓存中读取资源，不会发请求到服务器。比如某个css文件，如果浏览器在加载它所在的网页时，这个css文件的缓存配置命中了强缓
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