代码格式优化完毕

lib/widget_system/widgets/MultiChildRenderObjectWidget/NestedScrollViewViewport/node1_base.dart

@@ -20,6 +20,8 @@ import 'package:flutter/material.dart';
 //    }
 
 class NestedScrollViewViewportDemo extends StatelessWidget {
+  const NestedScrollViewViewportDemo({Key? key}) : super(key: key);
+
   final String info =
       'NestedScrollViewViewport 在源码中只有一处使用：'
       '_NestedScrollViewCustomScrollView 继承自 CustomScrollView，复写了 buildViewport 方法，返回 NestedScrollViewViewport 。'
@@ -27,12 +29,13 @@ class NestedScrollViewViewportDemo extends StatelessWidget {
       'NestedScrollViewViewport 的特点是持有 SliverOverlapAbsorberHandle 类对象 handle，源码中该 handle 在 NestedScrollViewState 中初始化。'
       '可通过上下文获取，用于 SliverOverlapAbsorber/SliverOverlapInjector 组件，使用详见相关组件。';
 
+
   @override
   Widget build(BuildContext context) {
     return Container(
       color: Colors.blue.withOpacity(0.1),
-      padding: EdgeInsets.all(10),
-      margin: EdgeInsets.all(10),
+      padding: const EdgeInsets.all(10),
+      margin: const EdgeInsets.all(10),
       child: Text(info),
     );
   }