log/logger.go
func (l *Logger) Fatal(args ...interface{}) {
	l.Output(2, LevelFatal, fmt.Sprint(args...))
	os.Exit(1)
}
func (l *Logger) Fatal(args ...interface{}) {
	l.Output(2, LevelFatal, fmt.Sprint(args...))
	os.Exit(1)
}
// Fatal records the log with fatal level and exits