| node | 层次结构节点。 |
int 层次结构节点的深度。值 -1 表示根节点。值 0 表示根节点的直接子节点。值 1 表示根节点的直接子节点的子节点，然后它们的子节点值为 2，依此类推。
确定节点的深度。
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