PWA 概念

Progressive web apps
Identifiable as applications, findable by search engines.
Available on the device, on users' home screens — without the hassle of an app store.
可安装,Web App Manifest
Easily shareable via URLs, without requiring complex installation.

Works for every user, regardless of browser choice.
// 对兼容性启用渐进增强

Makes user engagement easy by drawing attention, even when users aren't using their devices.
让用户重新回到 WebApp, 通过 sw, push, notification

Fits any form factor: desktop, mobile, tablet, or whatever comes next.

Delivery mechanism prevents snooping and ensures content hasn’t been tampered with.
HTTPS(HTTP2/3 弥补速度慢的问题)