add

lib/utils/constants.dart

 part of utils;
 
 // 服务器地址
-// const String kServerUrl = 'https://app.vning.com';
 // const String kServerUrl = 'http://192.168.11.88:81';
 const String kServerUrl = 'http://8.141.148.247:7421';
 // const String kServerUrl = 'http://1507.superge.cn:81';