Uri _baseUrl;
final isProd = const bool.fromEnvironment('dart.vm.product');
if (isProd) {
_baseUrl = Uri.parse('https://96.45.181.208:5000/');
} else {
_baseUrl = Uri.parse('https://dev.ajanuw.com:5000/');
}原文：https://www.cnblogs.com/ajanuw/p/11517530.html