判断debug模式(两种)

1. 通过断言判断

String baseURL = "release api url";
    assert((){
      baseURL = "dev api url";
      return true;
    }());

2. 通过全局变量判断

if(!kReleaseMode){}
String baseURL = kReleaseMode ? "release api url":"dev api url";

判断是否为web模式

if (kIsWeb){}