bootbox.confirm剂量不显示消息和页面崩溃

I'm new to bootstrap.I'm trying to show confirm message with bootbox format after click on delete btn .I know that bootbox.confirm need callback function so I utilize result and checked if its true then show it.I expect to see this: Are you sure to delete this customer? but after click noting happen and browser just freeze and I have to refresh it again. this is all my code:I'm new to bootstrap.I'm trying to show confirm