javascript - React JS 中的 service worker 是什么

Question

在创建 React 应用程序时，默认情况下会调用 Service Worker。为什么使用 Service Worker？默认调用的原因是什么？

Answer 1

您的应用程序可能不需要服务 worker 。如果您使用 create-react-app 创建一个项目，它会被默认调用

Service workers 在 article 中得到了很好的解释 。从中总结

A service worker is a script that your browser runs in thebackground, separate from a web page, opening the door to featuresthat don't need a web page or user interaction. Today, they alreadyinclude features like push notifications and background sync and haveability to intercept and handle network requests, includingprogrammatically managing a cache of responses.

In the future, service workers might support other things likeperiodic sync or geofencing.

根据这个 PR to create-react-app

Service workers are introduced with create-react-app viaSWPrecacheWebpackPlugin.

Using a server worker with a cache-first strategy offers performanceadvantages, since the network is no longer a bottleneck for fulfillingnavigation requests. It does mean, however, that developers (andusers) will only see deployed updates on the "N+1"visit to a page, since previously cached resources are updated in thebackground.

在新应用中默认启用对register service worker 的调用，但您可以随时将其删除，然后恢复正常行为。