func Successf(format string, val ...interface{}) error {
	return glg.out(OK, format, val...)
}
func Successf(format string, val ...interface{}) error {
	return glg.out(OK, format, val...)
}
func Successf ( format string , val ... interface { } ) error { return glg . out ( OK , format , val ... ) }
// Successf outputs formatted Success level log
Successf outputs formatted Success level log