/// <summary>
/// 移除一个Element
/// </summary>
/// <param name="element"></param>
public void Detach(Element element)
{
_list.Remove(element);
}
/// <summary>
/// 添加一个Element
/// </summary>
/// <param name="element"></param>
public void Attach(Element element)
{
_list.Add(element);
}
