当在php中点击按钮时，如何阻止页面滚动到顶部？

How do I stop a page from scrolling to the top when button Add to cart is clicked? since i have a lot of products showing up from database to my page, this refreshing the "index.php" to the top is make me frustrated. Btw i'm following this tutorial How do I stop a page from scrolling to the top