有一个全局布尔值
kIsWeb，可以告诉您该应用程序是否已编译为可以在网络上运行。
文档：https :
//api.flutter.dev/flutter/foundation/kIsWeb-
constant.html
import 'package:flutter/foundation.dart' show kIsWeb;if (kIsWeb) { // running on the web!} else { // NOT running on the web! You can check for additional platforms here.}
