Html::a 生成 method=post

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