Pull request #1985: 无JIRA任务 修复无法删除第一个元素的问题

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

* commit '3666aa55ae1bfcc48bf5447a163592124aa5a4b0':
  refactor: 修改描述
  fix: 修复无法删除第一个元素的问题

src/case/layer/pane.list.js

@@ -104,7 +104,7 @@ BI.ListPane = BI.inherit(BI.Pane, {
     },
 
     removeItemAt: function (indexes) {
-        indexes = indexes || [];
+        indexes = BI.isNull(indexes) ? [] : indexes;
         BI.removeAt(this.options.items, indexes);
         this.button_group.removeItemAt.apply(this.button_group, arguments);
         this.check();

typescript/case/layer/pane.list.ts

@@ -13,7 +13,7 @@ export declare class ListPane extends Pane {
 
     addItems<T>(items: T[]): void;
 
-    removeItemAt(indexes: number): void;
+    removeItemAt(indexes?: number | number[]): void;
 
     populate<T>(items?: T[]): void;