Flutter 正式支持 Web 平台

Flutter’s web support delivers the same experiences on the web as on mobile. Building on the portability of Dart, the power of the web platform and the flexibility of the Flutter framework, you can now build apps for iOS, Android, and the browser from the same codebase. You can compile existing Flutter code written in Dart into a web experience because it is exactly the same Flutter framework and web is just another device target for your app.

向 Flutter 添加 Web 支持涉及在标准浏览器 API 之上实现 Flutter 的核心绘图层。通过结合使用 DOM、Canvas 和 CSS,Web 支持旨在为现代浏览器提供便携、高质量和高性能的用户体验。我们在 Dart 中完全实现了这个核心绘图层,并使用 Dart 的优化过的 JavaScript 编译器将 Flutter 核心与框架,同你的应用程序一起编译成一个可以部署到任何 Web 服务器的简化源文件。

Flutter architecture for web

Adding web support to Flutter involved implementing Flutter’s core drawing layer on top of standard browser APIs, in addition to compiling Dart to JavaScript, instead of the ARM machine code that is used for mobile applications. Using a combination of DOM, Canvas, and WebAssembly, Flutter can provide a portable, high-quality, and performant user experience across modern browsers. We implemented the core drawing layer completely in Dart and used Dart’s optimized JavaScript compiler to compile the Flutter core and framework along with your application into a single, minified source file that can be deployed to any web server.

While you can do a lot on the web, Flutter’s web support is most valuable in the following scenarios:

A Progressive Web Application built with Flutter
Flutter delivers high-quality PWAs that are integrated with a user’s environment, including installation, offline support, and tailored UX.
Single Page Application
Flutter’s web support enables complex standalone web apps that are rich with graphics and interactive content to reach end users on a wide variety of devices.
Existing mobile applications
Web support for Flutter provides a browser-based delivery model for existing Flutter mobile apps.

Not every HTML scenario is ideally suited for Flutter at this time. For example, text-rich, flow-based, static content such as blog articles benefit from the document-centric model that the web is built around, rather than the app-centric services that a UI framework like Flutter can deliver. However, you can use Flutter to embed interactive experiences into these websites.

For a glimpse into how to migrate your mobile app to web, see the following video:

关于 web 支持的说明

Resources

以下资源可以帮助你入门:

The following resources can help you get started: