code: func NewDailyLogger(fileDir, fileName, prefix string, logScan int64, logSeq int) *FileLogger {
  	dailyLogger := &FileLogger{
  		splitType:  SplitType_Daily,
  		mu:         new(sync.RWMutex),
  		fileDir:    fileDir,
  		fileName:   fileName,
  		prefix:     prefix,
  		logScan:    logScan,
  		logChan:    make(chan string, logSeq),
  		logLevel:   DEFAULT_LOG_LEVEL,
  		logConsole: false,
  	}
  
  	dailyLogger.initLogger()
  
  	return dailyLogger
  }
docs: // NewDailyLogger return a logger split by daily
  // Parameters:
  // 		file directory
  // 		file name
  // 		log's prefix