dataProvider => $dataProvider,
        //filterModel => $searchModel,
        columns => [
            [class => yii\grid\SerialColumn],
            //显示的字段
            //code的值
            [attribute=>这是测试code,value=>function(){return abc;}],
            name,
            population,
            
            [class => yii\grid\ActionColumn,header => 操作,],
            [
                label=>更多操作,
                format=>raw,
                value => function($data){
                    $url = "http://www.baidu.com";
                    return Html::a(添加权限组, $url, [title => 审核]); 
                }
            ]        
        ],
    ]); ?>