public function access()
 {
     $this->web_title = '分配权限';
     if (IS_POST) {
         $roleId = I('role_id', 0, 'intval');
         $data = array();
         foreach (I('node_id') as $val) {
             $tmp = explode('_', $val);
             $data[] = array('role_id' => $roleId, 'node_id' => $tmp[0], 'level' => $tmp[1]);
         }
         M('access')->where(array('role_id' => $roleId))->delete();
         if (M('access')->addAll($data)) {
             $this->success('保存成功', U(MODULE_NAME . '/Rbac/access', array('id' => $roleId)));
         } else {
             $this->error('保存失败');
         }
         return;
     }
     $id = I('id');
     if ($id) {
         $this->role_id = $id;
     } else {
         $this->redirect(MODULE_NAME . '/Rbac/role');
     }
     $nodes = M('node')->order('sort')->select();
     $access = M('access')->where(array('role_id' => $id))->getField('node_id', true);
     $this->nodes = Category::prepareForAccess($nodes, 0, $access);
     $this->display();
 }