/// <summary>
/// 通过层级数转化为父节点引用
/// </summary>
/// <param name="layer"></param>
/// <returns></returns>
public NodeModifier LayerToParent(int layer)
{
layer--;
if (layer == 0)
{
return(this);
}
if (_lastNode != null)
{
return(_lastNode.LayerToParent(layer));
}
return(null);
}
