~本次添加的功能：

根据不同模式采用不同的TCP连接模式

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if(ui->LinkBotton->property("Mode")=="Server"){   //设置为服务器监听模式
    m_tcpServer=new QTcpServer(this);
    //服务端监听客户端发来的请求
    if(!m_tcpServer->listen(QHostAddress::AnyIPv4,6666)){
        qDebug()<<m_tcpServer->errorString();
        close();
    }
    connect(m_tcpServer,&QTcpServer::newConnection,this,&MainWindow::onNewConnect);
    connect(m_tcpServer,&QTcpServer::newConnection,this,&MainWindow::onSendBackMsg);
}
else if(ui->LinkBotton->property("Mode")=="Client"){   //设置为客户端模式
    m_tcpSocket=new QTcpSocket(this);
    //socket有数据来了，做处理
    connect(m_tcpSocket,&QTcpSocket::readyRead,
            this,&MainWindow::onReadMessage);
    connect(m_tcpSocket,SIGNAL(QAbstractSocket::SocketError),
            this,SLOT(onDisplayError(QAbstractSocket::SocketError)));
    m_tcpSocket->abort();
    //连接服务端
    m_tcpSocket->connectToHost(ui->Host->text(),
                               ui->Port->text().toInt());
}

建立新连接：

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void MainWindow::onNewConnect()
{
    //当前连接的客户端
    m_tcpSocket=m_tcpServer->nextPendingConnection();
    //断开连接
    connect(m_tcpSocket,&QTcpSocket::disconnected,
            m_tcpSocket,&QTcpSocket::deleteLater);
    //socket有数据时会发送readyRead信号
    connect(m_tcpSocket,&QTcpSocket::readyRead,
            this,&MainWindow::onReadMsg);
}

服务器接受数据后处理函数：

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void MainWindow::onReadMsg()
{
	//作为服务器时接收到数据处理信息
}