1、use yii\bootstrap\Modal;

2、创建一个按钮，用于调modal的显示

echo Html::a('创建', '#', [
'id' => 'create',
'data-toggle' => 'modal',
'data-target' => '#create-modal',
'class' => 'btn btn-success',
]);

3、创建modal

<?php 
Modal::begin([
'id' => 'create-modal',
'header' => '<h4 class="modal-title">创建</h4>',
'footer' => '<a href="#" class="btn btn-primary" data-dismiss="modal">Close</a>',
]); 
$requestUrl = Url::toRoute('create');
$js = <<<JS
$.get('{$requestUrl}', {},
function (data) {
$('.modal-body').html(data);
} 
);
JS;
$this->registerJs($js);
Modal::end(); 
?>

4、修改我们的create操作如下

public function actionCreate()
{
$model = new Test();
if ($model->load(Yii::$app->request->post()) && $model->save()) {
return $this->redirect(['index']);
} else {
return $this->renderAjax('create', [
'model' => $model,
]);
}
}