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.

Easily shareable via URLs, without requiring complex installation.

Works offline or on low quality networks.

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）