class ExamineInstance{

  factory ExamineInstance() => _getInstance();

  static ExamineInstance get instance => _getInstance();

  static ExamineInstance? _instance;

  late bool _isExamine;

  bool get isExamine => _isExamine;

  set isExamine(bool value) {
  this._isExamine = value;
  }

  ExamineInstance._internal(){
  //单例初始化
    _isExamine = true;
  }

  static ExamineInstance _getInstance(){
    if (_instance == null) {
      _instance = ExamineInstance._internal();
    }
  return _instance!;
  }

}