练习：优化登录框，输入完用户名和密码后，点击登录，判断账户是否为 Admin 密码 为123456，如果判断成功，则输出登录成功，并关闭整个登录界面，如果登录失败，则提示登录失败，并将账号和密码的行编辑器中的内容清空

#include "mywidget.h"MyWidget::MyWidget(QWidget *parent): QWidget(parent),btn(new QPushButton(this)),edit1(new QLineEdit(this)),edit2(new QLineEdit(this)){//==============窗口相关设置=======this->resize(540,415);this->setFixedSize(540,415);//窗口标题this->setWindowTitle("盗版QQ");//窗口图标this->setWindowIcon(QIcon(":/pictrue/qq.gif"));//背景颜色this->setStyleSheet("background-color:white");//去掉头部this->setWindowFlag(Qt::FramelessWindowHint);//============标签相关设置=======QLabel *lab1 = new QLabel(this);//设置大小lab1->resize(540, 160);lab1->setStyleSheet("background-color:pink");//动图类 接收动图QMovie *mv = new QMovie(":/pictrue/zz.gif");//将动图放入标签中lab1->setMovie(mv);//让动图动起来mv->start();//自动适应lab1->setScaledContents(true);QLabel *lab2 = new QLabel(this);lab2->resize(30,30);lab2->move(120,210);lab2->setPixmap(QPixmap(":/pictrue/wodepeizhenshi.png"));lab2->setScaledContents(true);QLabel *lab3 = new QLabel(this);lab3->resize(30,30);lab3->move(120, 260);lab3->setPixmap(QPixmap(":/pictrue/passwd.jpg"));lab3->setScaledContents(true);//============行编辑器相关设置=======
//    QLineEdit *edit1 = new QLineEdit(this);edit1->resize(275,30);edit1->move(155,210);edit1->setPlaceholderText("QQ号/手机号/邮箱");//   QLineEdit *edit2 = new QLineEdit(this);edit2->resize(275,30);edit2->move(155,260);edit2->setPlaceholderText("密码");edit2->setEchoMode(QLineEdit::Password);//============按钮相关设置=======
//    QPushButton *btn = new QPushButton("登录",this);btn->resize(300,45);btn->move(120,345);//样式函数setStyleSheet()btn->setStyleSheet("background-color:rgb(8,189,253);border-radius:5px;color:white");// btn->setEnabled(false);connect(edit1,&QLineEdit::textChanged,this,&MyWidget::signel);connect(edit2,&QLineEdit::textChanged,this,&MyWidget::signel);}void MyWidget::signel()
{if(edit1->text().size()>=5 && edit2->text().size()>=5){btn->setStyleSheet("background-color:green");}}
MyWidget::~MyWidget()
{
}

#ifndef MYWIDGET_H
#define MYWIDGET_H#include <QWidget>
#include<QIcon> //图标类
#include<QLabel> //标签类
#include<QMovie> //动图类
#include<QLineEdit> //行编辑器类
#include<QPushButton> //按钮类
#include<QDebug>QT_BEGIN_NAMESPACE
namespace Ui { class MyWidget; }
QT_END_NAMESPACEclass MyWidget : public QWidget
{Q_OBJECT
public:QPushButton *btn;QLineEdit *edit1;QLineEdit *edit2;
public:MyWidget(QWidget *parent = nullptr);~MyWidget();
public slots:void signel();             //自定义处理按钮4的槽函数的声明
private:Ui::MyWidget *ui;
};
#endif // MYWIDGET_H