Qt 信号与槽connect方式

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    QPushButton *pushButton = new QPushButton(this);
    pushButton->setObjectName("TestButton");
    ui->setupUi(this);
}



Widget::~Widget()
{
    delete ui;
}


void Widget::on_TestButton_clicked()
{
    close();
}

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    QPushButton *pushButton =new QPushButton(this);
    pp->setObjectName("TestButton");
    ui->setupUi(this);
    connect(pp,SIGNAL(clicked()),this,SLOT(mySlot()));
}

Widget::~Widget()
{
    delete ui;
}

void Widget::mySlot(){
    qDebug() << "Hello World";
}