log/logger.go
func (l *Logger) Infoln(args ...interface{}) {
	l.Output(2, LevelInfo, fmt.Sprintln(args...))
}
func (l *Logger) Infoln(args ...interface{}) {
	l.Output(2, LevelInfo, fmt.Sprintln(args...))
}
// Infoln records the log with info level