//更新数据    public function update(){        $wx = M('wxmenu');        $map['pid'] = 0;        //查询主菜单数据        $wxmenu = $wx->where($map)->select();        $arr = array();        //循环主菜单        foreach ($wxmenu as $key => $value) {            $parent_arr = array();            $map['pid'] = $value['id'];            $submenu = $wx->where($map)->select();            //判断是否有子菜单(默认有)            $has_sub = true;            //如果没有子菜单            if(empty($submenu)){                $parent_arr['type'] = $value['type'];                $has_sub = false;            }            $parent_arr['name'] = $value['name'];            //控制显示顺序            if(!$has_sub){                $parent_arr[$value['type'] == 'click' ? 'key' : 'url'] = $value['url'];            }            $subdata = array();            //循环子菜单            foreach ($submenu as $k=>$v) {                $tmp_ku = $v['type'] == 'click' ? 'key' : 'url';                $tmp_arr = array(                    'type'  => $v['type'],                    'name'  => $v['name'],                    $tmp_ku => $v['url']                );                array_push($subdata,$tmp_arr);            }            if($has_sub){                $parent_arr['sub_button'] = $subdata;            }            array_push($arr,$parent_arr);        }        dump($arr);        dump($arr[0]);        //转化成json结构        echo json_encode(array('button'=>$arr));        die();    }