m_treeWidget->setRootIsDecorated( false ); //去掉虚线边框
m_treeWidget->setFrameStyle(QFrame::NoFrame); //去掉边框
m_treeWidget->setStyleSheet("QTreeView::branch {image:none;}"); //去掉子节点的虚框
m_treeWidget->setRootIsDecorated( false ); //去掉虚线边框
m_treeWidget->setFrameStyle(QFrame::NoFrame); //去掉边框
m_treeWidget->setStyleSheet("QTreeView::branch {image:none;}"); //去掉子节点的虚框