logger.go
func (l *logger) Okf(format string, vals ...interface{}) {
	l.mut.Lock()
	defer l.mut.Unlock()
	s := fmt.Sprintf(format, vals...)
	l.logger.Output(2, "OK: "+s)
	l.callHandlers(LevelOK, s)
}
func (l *logger) Okf(format string, vals ...interface{}) {
	l.mut.Lock()
	defer l.mut.Unlock()
	s := fmt.Sprintf(format, vals...)
	l.logger.Output(2, "OK: "+s)
	l.callHandlers(LevelOK, s)
}
func ( l * logger ) Okf ( format string , vals ... interface { } ) { l . mut . Lock ( ) defer l . mut . Unlock ( ) s := fmt . Sprintf ( format , vals ... ) l . logger . Output ( 2 , " " + s ) l . callHandlers ( LevelOK , s ) }
// Okf logs a formatted line with an OK prefix.
Okf logs a formatted line with an OK prefix .