src/Models/Tree.php
public function getChildren($columns = ['*'])
	{
		$columns = $this->formatColumns($columns);
		$builder = static::where($this->parentKey, $this->getKey());
		!empty($this->orderKey) && $builder->orderBy($this->orderKey);
		return $builder->get();
	}
public function getChildren($columns = ['*'])
	{
		$columns = $this->formatColumns($columns);
		$builder = static::where($this->parentKey, $this->getKey());
		!empty($this->orderKey) && $builder->orderBy($this->orderKey);
		return $builder->get();
	}
获得子集，返回一个Collection

@return array 返回数据