void IExternalizable.WriteExternal(IExternalWriter writer)
{
writer.WriteByte(Amf3Type.Object);
if (writer.WriteReference(this)) return;
//动态对象方式
writer.WriteByte(0x0b);
writer.WriteByte(0x01);
this.WriteAmf3(writer);
writer.WriteByte(0x01);
}