glg.go
func (g *Glg) AddStdLevel(tag string, mode MODE, isColor bool) *Glg {
	atomic.AddUint32(g.levelCounter, 1)
	lev := LEVEL(atomic.LoadUint32(g.levelCounter))
	g.levelMap.Store(tag, lev)
	l := &logger{
		writer:  nil,
		std:     os.Stdout,
		color:   Colorless,
		isColor: isColor,
		mode:    mode,
		tag:     tag,
	}
	l.updateMode()
	g.logger.Store(lev, l)
	return g
}
func (g *Glg) AddStdLevel(tag string, mode MODE, isColor bool) *Glg {
	atomic.AddUint32(g.levelCounter, 1)
	lev := LEVEL(atomic.LoadUint32(g.levelCounter))
	g.levelMap.Store(tag, lev)
	l := &logger{
		writer:  nil,
		std:     os.Stdout,
		color:   Colorless,
		isColor: isColor,
		mode:    mode,
		tag:     tag,
	}
	l.updateMode()
	g.logger.Store(lev, l)
	return g
}
// AddStdLevel adds std log level and returns LEVEL