Pull request #3611: 无JIRA任务 补充类型

Merge in VISUAL/fineui from ~OLIVER.KE/fineui:master to master

* commit '12d9ac56aa79e4ff617232a29677ec38fea874f6':
  无JIRA任务 补充类型

packages/fineui/typescript/case/button/icon/icon.change.ts

@@ -6,7 +6,7 @@ export declare class IconChangeButton extends Single {
     static EVENT_CHANGE: string;
 
     props: {
-        iconCls: string;
+        iconCls: string | (() => string);
     } & IconButton['props']
 
     isSelected(): boolean;