Pull request #1892: refactor: 声明调整

Merge in VISUAL/fineui from ~KIRA/fineui:master to master

* commit 'c83aa2093620d7e4693b10156d5fb952ce8c5f09':
  revert: 回退
  JSY-4371 feat: 提供最后一行最后一列标记
  refactor: 声明调整
  JSY-4371 feat: 提供最后一行最后一列标记
  JSY-4371 feat: 格式
  JSY-4371 feat: 提供最后一行最后一列标记

typescript/core/ob.ts

@@ -71,7 +71,7 @@ export declare class OB {
 
     once(eventName: string, fn: Function): void;
 
-    un(eName: string, fn: Function): void;
+    un(eName: string, fn?: Function): void;
 
     _initRef(): void;