func (actorSelf *ActorDef) GetDefault() *ActorDef {
	return defaultActor
}
GetDefault Get Default Actor
package fpgo
import (
	"time"
)
type ActorDef struct {
	isClosed bool
	ch       *chan interface{}
	effect   func(*ActorDef, interface{})
	context map[string]interface{}
	children map[time.Time]*ActorDef
	parent   *ActorDef
}
var defaultActor *ActorDef