Yii2中Confirm按钮不弹出确认框怎么办？

<?= html::a(yii::t('app','delete'), ['delete', 'id' => $model->id], [    'class' => 'btn btn-danger',    'data' => [        'confirm' => 'are you sure you want to delete this item?',        'method' => 'post',    ],]) ?>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

use yiijuiWidget;Widget::register($this);