您没有发布使用的center方法的代码或未描述使用的插件.无论如何，我认为您应该在afterShowForm内而不是beforeShowForm内使用delDiv.center();.

You don't posted the code of center method which you use or describe which plugin you use. In any way I think that you should use delDiv.center(); inside of afterShowForm and not inside of beforeShowForm.

就像您可以在演示一样，滚动问题一般不存在.

Like you can see on the demo the problem with scrolling should not exist in general.