print("test");

String str ="张三"；
print("测试输出 $str ");

int count = 40;
print("测试输出 $count ");

User user = new User(name:"张三");
 
 ///输出name
 print("测试输出 ${user.name} ");

common_utils: ^1.1.1

//初始化设置 LogUtil
LogUtil.init(true);
//输出日志
LogUtil.v("test");

class LogUtil {
  static const String _TAG_DEF = "###common_utils###";

  static bool debuggable = false; //是否是debug模式,true: log v 不输出.
  static String TAG = _TAG_DEF;

  static void init({bool isDebug = false, String tag = _TAG_DEF}) {
    debuggable = isDebug;
    TAG = tag;
  }

  static void e(Object object, {String tag}) {
    _printLog(tag, '  e  ', object);
  }

  static void v(Object object, {String tag}) {
    if (debuggable) {
      _printLog(tag, '  v  ', object);
    }
  }

  static void _printLog(String tag, String stag, Object object) {
    StringBuffer sb = new StringBuffer();
    sb.write((tag == null || tag.isEmpty) ? TAG : tag);
    sb.write(stag);
    sb.write(object);
    print(sb.toString());
  }
}