func (l *Logger) Debugf(format string, args ...interface{}) {
	l.Output(2, LevelDebug, fmt.Sprintf(format, args...))
}
func (l *Logger) Debugf(format string, args ...interface{}) {
	l.Output(2, LevelDebug, fmt.Sprintf(format, args...))
}
func ( l * Logger ) Debugf ( format string , args ... interface { } ) { l . Output ( 2 , LevelDebug , fmt . Sprintf ( format , args ... ) ) }
// Debugf records the log with debug level
Debugf records the log with debug level