ThinkPHP控制器间实现相互调用的方法

class ColumnsAction extends Action{  
public function ncatlist(){ 
    $Columns=new Model; 
                    
    $News = M("News"); 
    $list=$Columns->query("SELECT concat(colPath,'-',colId) AS bpath, colId,colPid,colPath, colTitle, description,ord FROM ".C('DB_PREFIX')."columns where typeid=1  
     
ORDER BY bpath, colId"); 
                                 
       $this->assign('alist',$list);      
      } 
} 
class NewsAction extends CommonAction { 
     
    // 首页 
    public function index() { 
   $Columns=A("Columns"); 
   $Columns->ncatlist(); 
}