mozilla官方介绍的预加载
https://developer.mozilla.org/en-US/docs/Web/HTML/Link_types/preload#browser_compatibility
预加载：它有什么用？
https://www.smashingmagazine.com/2016/02/preload-what-is-it-good-for/
预加载密钥请求
https://web.dev/uses-rel-preload/
预加载关键资产以提高加载速度
https://web.dev/preload-critical-assets/
消除渲染阻塞资源
https://web.dev/render-blocking-resources/?utm_source=lighthouse&utm_medium=unknown
网络功能参考
https://developer.chrome.com/docs/devtools/network/reference/#timing-explanation
Chrome 开发者工具
https://developer.chrome.com/docs/devtools/overview/