modal组件能否考虑加个afterOpen回调

[mkanako]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

目前，我modal打开后，会有一个ajax请求，请求会带个全屏loading动画，而modal打开也有一个动画，这样2个动画会同时进行，视觉效果很不好，所以如果能有个afterOpen回调在modal动画完成后，再进行我的操作，就完美了

然后我看react那边也没有afterOpen，有人提过ant-design/ant-design#4978 ，最后给出的理由和方法也是不能解决我这个情况，或者他们也没想到我这种情况

而elementUI的modal就有打开动画完成后的回调

What does the proposed API look like?

类似afterCLose

[mkanako]

问了react那边不加😂

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