设置QPlainTextEdit设置背景颜色和字体颜色

//设置字体颜色       
QTextCharFormat fmt;
fmt.setForeground(Qt::red);
ui->m_pteditResourceFile->mergeCurrentCharFormat(fmt);

//设置背景颜色
QPalette p = ui->m_pteditResourceFile->palette();
p.setColor(QPalette::Active, QPalette::Base, Qt::red);
p.setColor(QPalette::Inactive, QPalette::Base, Qt::red);
ui->m_pteditResourceFile->setPalette(p);