### modal
```
echo GridView::widget([
'dataProvider' => $dataProvider,
'columns' => [
[
'class' => 'yii\grid\ActionColumn',
'template' => '{update}',
'buttons' => [
'update' => function ($url, $model, $key) {
return Html::a('点击', '#', [
'data-toggle' => 'modal', //指定形式,modal是弹窗
'data-target' => '#update-modal', //指定动作
]);
}
],
],
]
]);
Modal::begin([
'id' => 'update-modal', //动作id
'header' => '<h4 class="modal-title">更新</h4>', //header显示的名称
'footer' => '<a href="#" class="btn btn-primary" data-dismiss="modal">Close</a>', //footer显示的名称
'form' => 'doWithdrawForm',
]);
Modal::end();
```
