这个分页是dataProvider传过去的,一页的信息条数在dataProvider中设置好就行.

在models中的xxxSearch.php中

    public function search($params)
    {
        ...

        $dataProvider = new ActiveDataProvider([
            'query' => $query,
            'pagination' => [
                'pageSize' => 20,
            ],
        ]);
        ...