list集合转树形结构

源数据格式： [{ "children": [], "hasChild": 1, "pid": 0, "id": 1, "text": "北京" }, { "children": [], "hasChild": 1, "pid": 1, "id": 2, "text": "纳什空间" }, { "children": [], "hasChild": 0, "pid": 2, "id": 3, "t

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