connect的变化使用

connect( _timer , SIGNAL (timeout()), this , SLOT (upDateTimeSlot()));

   connect(ui-> _timer , SIGNAL (timeout), this , SLOT (upDateTimeSlot));

变化2: 

  connect(_timer,&QTimer::timeout,this,&App::upDateTimeSlot);

变化3:

connect(timer,  & QTimer::timeout,  [=]()  {  offset  +=   0.6;  update();  });

变化4:

connect( button,  &QP Button::clicked,   this,  [=]{ player ->seekward(); }); 变化5:connect(exitAction,  &QAction::triggered,   this,  [=] {   qApp->quit();   });