JS深入浏览器缓存分强缓存和协商缓存
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- HTML
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Description
### 强缓存
**状态码200**
**不会向服务器发送请求，从缓存中读取资源，如果响应头有expires、pragma或者cache-control字段，代表这 是强缓存**
1. Expires HTTP/1.0 时间不准
2. Cache-Control HTTP/1.1
3. Cache-Control优先级高，覆盖Expires
4. Cache-Control设置no-cache开启协商缓存
5. 缓存过期之后，不管资源有没有变化，都会重新发起请求，重新获取资源
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