<?= GridView::widget([
        'dataProvider' => $dataProvider,
        'columns' => [
            ['class' => 'yii\grid\SerialColumn'],
            [
                'attribute' => 'logo',
                'label'=>'图标',
                'format'=>'html',//格式为html
                'value'=>function ($model) {
                    $s='';
                    if($model->logo){
                        $s=Html::img($model->logo);
                    }
                    return $s;
                },
            ],
            ['class' => 'yii\grid\ActionColumn'],
        ],
    ]); ?>