希望AModal的dialogClass属性能同时兼容object和string两种类型，感谢 #2481
Description
- I have searched the issues of this repository and believe that this is not a duplicate.
What problem does this feature solve?
如下这种使用方式，动态控制类名
dialogClass: {
'class-a': true,
'class-b': false,
}What does the proposed API look like?
dialogClass: {
type: [String, Object, Array], // vue 还支持一种数组形式的class，这个加了最好，不加也行
default: ()=>({})
}