DNS预解析 dns-prefetch

1、DNS 是什么？

　　Domain Name System

　　DNS-Chrome--　　DNS Prefetching

2、如何使用 DNS Prefetching？

　　DNS Prefetch

　　//? ? https?https?http?

3、DNS Prefetching的优势

　　DNS Prefetching

　　aDNSjs

--- DNS Chrome

4、功能的有效性

0~1ms,

　　DNS

DNS

chrome　　　　"about:histograms/DNS" and "about:dns"

　　1. 　　2. 　　3. 　　4.

5、其他

　　1.

　　2.

　　3.　　Each request typically involves sending a single UDP packet that is under 100 bytes out,and getting back a response that is around 100 bytes. This minimal impact on network usage is compensated by a significant improvement in user experience.

　　4.

　　5.js

?参考自：SEO-DNS-Prefetching.html" target="_blank">https://www.cnblogs.com/zdz8207/p/SEO-DNS-Prefetching.html

（编辑：李大同）

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