我山寨的苹果官网 demo，右边是原生页面，可以看到用flutter同时适配PC和手机宽度都不是问题
编译成web：
flutter build webThis project is a starting point for a Flutter application.
A few resources to get you started if this is your first Flutter project:
For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.