$dataProvider = new ActiveDataProvider([ 
'query' => $query, 
]); 
$dataProvider->setSort(false);

'options' => [
// ...其他设置项
'id' => 'grid'
],

[
'class' => 'yii\grid\CheckboxColumn',
'name' => 'id',
],

<?= Html::a('批量删除', "javascript:void(0);", ['class' => 'btn btn-success gridview']) ?>

<?php
$this->registerJs('
$(".gridview").on("click", function () {
//注意这里的$("#grid")，要跟我们第一步设定的options id一致
var keys = $("#grid").yiiGridView("getSelectedRows");
console.log(keys);
});
');
?>

GridView::widget([
// ......
'options' => ['class' => 'grid-view','style'=>'overflow:auto', 'id' => 'grid'],
// ......
'columns' => [
// ......
[
'class' => 'yii\grid\CheckboxColumn',
'name' => 'id',
],
// ......
],
]);
$this->registerJs('
$(".gridview").on("click", function () {
var keys = $("#grid").yiiGridView("getSelectedRows");
console.log(keys);
});
');