/***槽函数:处理buttonBox中的单击按钮事件***/
void MainWindow::on_buttonBox_clicked(QAbstractButton*button)
{
QString str;
str = ui->textEdit->toPlainText();
if(button == ui->buttonBox->button(QDialogButtonBox::Ok))
{
if(!ui->lineEdit->text().isEmpty())
{
str += ui->lineEdit->text()+"\n";
ui->textEdit->setPlainText(str); //更新textEdit
}
}
else if(button == this->Clear)
{