/// <summary>
/// 给一个node加入一个叶子
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <param name="node"></param>
/// <param name="newLeaf"></param>
public static void AddLeaf <TKey>(this BaseNode <TKey> node, BaseLeaf <TKey> newLeaf)
{
if (node.ChildrenNull())
{
node.ChildrenNodes = new List <BaseLeaf <TKey> >();
}
node.ChildrenNodes.Add(newLeaf);
}
