func NewDefaultLogger(fileDir, fileName string) *FileLogger {
	return NewSizeLogger(fileDir, fileName, "",
		DEFAULT_FILE_COUNT, DEFAULT_FILE_SIZE, DEFAULT_FILE_UNIT, DEFAULT_LOG_SCAN, DEFAULT_LOG_SEQ)
}
func NewDefaultLogger(fileDir, fileName string) *FileLogger {
	return NewSizeLogger(fileDir, fileName, "",
		DEFAULT_FILE_COUNT, DEFAULT_FILE_SIZE, DEFAULT_FILE_UNIT, DEFAULT_LOG_SCAN, DEFAULT_LOG_SEQ)
}
func NewDefaultLogger ( fileDir , fileName string ) * FileLogger { return NewSizeLogger ( fileDir , fileName , " " , DEFAULT_FILE_COUNT , DEFAULT_FILE_SIZE , DEFAULT_FILE_UNIT , DEFAULT_LOG_SCAN , DEFAULT_LOG_SEQ ) }
// NewDefaultLogger return a logger split by fileSize by default
NewDefaultLogger return a logger split by fileSize by default