假设数据库中会计科目数据表的字段为：id,code,name,islast。分别为自增主键，科目编码，科目名称，是否为末级("1"表示末级科目)。这里在Thinkphp的模型层中使用递归来构建ComboTree所需的数据，代码及注解如下:
AccountModel = ->field('id,code,name,islast')->( & = (['code'( == 3['pid'] = 0['pid'] = (['code'],0,-2 ->createTree( createSubTree(, = ( =>(['pid'] == = 'id' => ['id'],
'text'=>['name'],
'state'=>(['islast'] != 1)?'closed':'open'(['islast'] != 1 = ->createSubTree(,['code'(!(['children'] = (, createTree( = ( => (['pid'] == 0 = 'id' => ['id'],
'text'=>['name'],
'state'=>'closed' = ->createSubTree(,['code'(!(['children'] = [] =类似上述的数据（如部门，地区等）需要构建树形菜单的简单修改代码后基本都能实现类似功能。
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