code: def _set_collapse_interval(data, interval):
          
          if interval <= 0:
              return data
          if data and isinstance(data, list):
              for d in data:
                  children = d.get("children", None)
                  if children and interval > 0:
                      for index, value in enumerate(children):
                          if index % interval == 0:
                              value.update(collapsed="false")
              return data
docs: 间隔折叠节点，当节点过多时可以解决节点显示过杂间隔。
  
          :param data: 节点数据
          :param interval: 指定间隔