程序運行截圖如下：

代碼如下：

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget>namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();public slots:void timer1Update();void timer2Update();void timer3Update();void btnClicked();private:Ui::Widget *ui;int timer_i_1;int timer_i_2;int timer_i_3; };#endif // WIDGET_H

widget.cpp

#include "widget.h" #include "ui_widget.h"#include <QTimer> #include <QDebug>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);this->setWindowTitle("CSDN IT1995");connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(btnClicked())); }void Widget::btnClicked(){QTimer *timer1=new QTimer();timer1->start(100);QTimer *timer2=new QTimer();timer2->start(200);QTimer *timer3=new QTimer();timer3->start(300);timer_i_1=0;timer_i_2=0;timer_i_3=0;connect(timer1,SIGNAL(timeout()),this,SLOT(timer1Update()));connect(timer2,SIGNAL(timeout()),this,SLOT(timer2Update()));connect(timer3,SIGNAL(timeout()),this,SLOT(timer3Update())); }void Widget::timer1Update(){ui->spinBox->setValue(timer_i_1++); }void Widget::timer2Update(){ui->spinBox_2->setValue(timer_i_2++); }void Widget::timer3Update(){ui->spinBox_3->setValue(timer_i_3++); }Widget::~Widget() {delete ui; }

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

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