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)
{
    //设置标题
    this->setWindowTitle("登录");
    //设置图标
    this->setWindowIcon(QIcon(":/new/prefix1/C:/Users/DC/Desktop/pictrue/qq.png"));
    //设置背景颜色
    this->setStyleSheet("background-color:rgb(255,255,255)");
    //固定窗口大小
    this->setFixedSize(540,400);
    //去掉头部
    //this->setWindowFlag(Qt::FramelessWindowHint);

    QLabel *lab1=new QLabel("标签",this);
    lab1->resize(540,400);
    lab1->setStyleSheet("background-color:green");
    QMovie *mv = new QMovie(":/new/prefix1/C:/Users/DC/Desktop/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("账号",this);
    lab2->resize(40,40);
    lab2->setPixmap(QPixmap(":/new/prefix1/C:/Users/DC/Desktop/pictrue/1.png"));
    lab2->move(100,100);
    lab2->setScaledContents(true);

    QLabel *lab3=new QLabel("密码",this);
    lab3->resize(40,40);
    lab3->setPixmap(QPixmap(":/new/prefix1/C:/Users/DC/Desktop/pictrue/2.jpg"));
    lab3->move(100,150);
    lab3->setScaledContents(true);

    edit1=new QLineEdit;
    edit1->setPlaceholderText("QQ号/手机号");
    edit1->setParent(this);
    edit1->resize(260,40);
    edit1->move(150,100);

    edit2=new QLineEdit("密码",this);
    edit2->setEchoMode(QLineEdit::Password);
    edit2->resize(260,40);
    edit2->move(150,150);

    btn1=new QPushButton("登录",this);
    btn1->resize(120,50);
    btn1->move(210,200);
    //btn1->setEnabled(false);
    //样式函数setStyleSheet()
    btn1->setStyleSheet("background-color:rgb(8,189,253);border-radius:5px;color:white");

    connect(this->btn1,&QPushButton::clicked,this,&MyWidget::myslots);
}

MyWidget::~MyWidget()
{
}
void MyWidget::myslots(void)
{
    if(this->edit1->text()=="root"&&this->edit2->text()=="123")
    {
        qDebug()<<"登录成功";
        this->close();
    }else{
        qDebug()<<"登录失败";
        this->edit1->clear();
        this->edit2->clear();
    }
}