func (b *Builder) Del(ns ...string) *Builder {
	for _, n := range ns {
		for i, a := range b.add {
			if a.Name == n {
				b.add = append(b.add[:i], b.add[i+1:]...)
			}
		}
		b.del = append(b.del, n)
	}
	return b
}
func (b *Builder) Del(ns ...string) *Builder {
	for _, n := range ns {
		for i, a := range b.add {
			if a.Name == n {
				b.add = append(b.add[:i], b.add[i+1:]...)
			}
		}
		b.del = append(b.del, n)
	}
	return b
}
func ( b * Builder ) Del ( ns ... string ) * Builder { for _ , n := range ns { for i , a := range b . add { if a . Name == n { b . add = append ( b . add [ : i ] , b . add [ i + 1 : ] ... ) } } b . del = append ( b . del , n ) } return b }
// Del deletes the label of the given name.
Del deletes the label of the given name .