ui->textBrowser->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);//設置垂直滾動條不可見
ui->textBrowser->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);//設置水平滾動條不可見
text_cursor.movePosition(QTextCursor::End);
ui->textBrowser->setTextCursor(text_cursor);