diff --git a/lib/views/widgets/StatelessWidget/Text/node1_base.dart b/lib/views/widgets/StatelessWidget/Text/node1_base.dart
index e43363f..c49082d 100644
--- a/lib/views/widgets/StatelessWidget/Text/node1_base.dart
+++ b/lib/views/widgets/StatelessWidget/Text/node1_base.dart
@@ -20,7 +20,7 @@ import 'package:flutter/material.dart';
 class CustomText extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    var style = TextStyle(
+    TextStyle style = const TextStyle(
       color: Colors.blue,
       fontSize: 20,
       fontWeight: FontWeight.bold,
diff --git a/lib/views/widgets/StatelessWidget/Text/node2_shadows.dart b/lib/views/widgets/StatelessWidget/Text/node2_shadows.dart
index 8726b05..6770a09 100644
--- a/lib/views/widgets/StatelessWidget/Text/node2_shadows.dart
+++ b/lib/views/widgets/StatelessWidget/Text/node2_shadows.dart
@@ -15,7 +15,7 @@ import 'package:flutter/material.dart';
 class ShadowText extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return Text(
+    return const Text(
       "张风捷特烈",
       style: TextStyle(
           fontSize: 50,
diff --git a/lib/views/widgets/StatelessWidget/Text/node3_decoration.dart b/lib/views/widgets/StatelessWidget/Text/node3_decoration.dart
index 3d21caa..bf6d736 100644
--- a/lib/views/widgets/StatelessWidget/Text/node3_decoration.dart
+++ b/lib/views/widgets/StatelessWidget/Text/node3_decoration.dart
@@ -18,7 +18,7 @@ import 'package:flutter/material.dart';
 class DecorationText extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return Text(
+    return const Text(
       "19940328",
       style: TextStyle(
           fontSize: 50,
diff --git a/lib/views/widgets/StatelessWidget/Text/node4_textAlign.dart b/lib/views/widgets/StatelessWidget/Text/node4_textAlign.dart
index e62c426..44bd4b5 100644
--- a/lib/views/widgets/StatelessWidget/Text/node4_textAlign.dart
+++ b/lib/views/widgets/StatelessWidget/Text/node4_textAlign.dart
@@ -19,13 +19,13 @@ class TextAlignText extends StatelessWidget {
       spacing: 10,
       runSpacing: 10,
       children: TextAlign.values
-          .map((e) => Container(
+          .map((TextAlign textAlign) => Container(
         width: 120,
         color: Colors.cyanAccent.withAlpha(33),
         height: 120 * 0.618,
         child: Text(
           " 张风捷特烈 toly " * 3,
-          textAlign: e,
+          textAlign: textAlign,
         ),
       ))
           .toList(),
diff --git a/lib/views/widgets/StatelessWidget/Text/node5_textDirection.dart b/lib/views/widgets/StatelessWidget/Text/node5_textDirection.dart
index b461332..dd301de 100644
--- a/lib/views/widgets/StatelessWidget/Text/node5_textDirection.dart
+++ b/lib/views/widgets/StatelessWidget/Text/node5_textDirection.dart
@@ -20,13 +20,13 @@ class TextDirectionText extends StatelessWidget {
       spacing: 40,
       runSpacing: 10,
       children: TextDirection.values
-          .map((e) => Container(
+          .map((TextDirection direction) => Container(
         width: 120,
         color: Colors.cyanAccent.withAlpha(33),
         height: 120 * 0.618,
         child: Text(
           " 张风捷特烈 toly " * 10,
-          textDirection: e,
+          textDirection: direction,
           maxLines: 3,
           overflow: TextOverflow.ellipsis,
         ),
diff --git a/lib/views/widgets/StatelessWidget/Text/node6_softWrap.dart b/lib/views/widgets/StatelessWidget/Text/node6_softWrap.dart
index 5e24d21..abbe4e0 100644
--- a/lib/views/widgets/StatelessWidget/Text/node6_softWrap.dart
+++ b/lib/views/widgets/StatelessWidget/Text/node6_softWrap.dart
@@ -20,14 +20,16 @@ class SoftWrapText extends StatelessWidget {
       spacing: 10,
       runSpacing: 10,
       children: TextOverflow.values
-          .map((e) => Container(
-        width: 150,
-        color: Colors.cyanAccent.withAlpha(33),
-        height: 150 * 0.618 * 0.618,
-        child: Text(" 张风捷特烈 toly " * 5,
-            overflow: e,
-            softWrap: false),
-      ))
+          .map((TextOverflow textOverflow) => Container(
+                width: 150,
+                color: Colors.cyanAccent.withAlpha(33),
+                height: 150 * 0.618 * 0.618,
+                child: Text(
+                  " 张风捷特烈 toly " * 5,
+                  overflow: textOverflow,
+                  softWrap: false,
+                ),
+              ))
           .toList(),
     );
   }
diff --git a/lib/views/widgets/StatelessWidget/Theme/node1_base.dart b/lib/views/widgets/StatelessWidget/Theme/node1_base.dart
index f90f146..5ca9fe9 100644
--- a/lib/views/widgets/StatelessWidget/Theme/node1_base.dart
+++ b/lib/views/widgets/StatelessWidget/Theme/node1_base.dart
@@ -13,8 +13,8 @@ import 'package:flutter/material.dart';
 class TextThemeDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    var queryData = Theme.of(context).textTheme;
-    var styles = {
+    TextTheme queryData = Theme.of(context).textTheme;
+    Map<String, TextStyle> styles = {
       "headline: ": queryData.headline,
       "title: ": queryData.title,
       "subhead: ": queryData.subhead,
@@ -32,32 +32,34 @@ class TextThemeDemo extends StatelessWidget {
 
     return Container(
       child: Column(
-        children: styles.keys.map((e) => buildItem(e, styles[e])).toList(),
+        children: styles.keys
+            .map((String styleInfo) => buildItem(styleInfo, styles[styleInfo]))
+            .toList(),
       ),
     );
   }
 
-  Widget buildItem(String e, TextStyle style) => Column(
-    children: <Widget>[
-      Padding(
-        padding: const EdgeInsets.all(8.0),
-        child: Row(
-          mainAxisAlignment: MainAxisAlignment.spaceBetween,
-          children: <Widget>[
-            Text(
-              e,
-              style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
-            ),
-            Text(
+  Widget buildItem(String styleInfo, TextStyle style) => Column(
+        children: <Widget>[
+          Padding(
+            padding: const EdgeInsets.all(8.0),
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              children: <Widget>[
+                Text(
+                  styleInfo,
+                  style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
+                ),
+                Text(
               "@toly",
               style: style,
             )
           ],
         ),
       ),
-      Divider(
-        height: 1,
-      )
-    ],
+          const Divider(
+            height: 1,
+          )
+        ],
   );
 }
\ No newline at end of file
diff --git a/lib/views/widgets/StatelessWidget/Theme/node2_use.dart b/lib/views/widgets/StatelessWidget/Theme/node2_use.dart
index a6b2ca1..6944cd5 100644
--- a/lib/views/widgets/StatelessWidget/Theme/node2_use.dart
+++ b/lib/views/widgets/StatelessWidget/Theme/node2_use.dart
@@ -16,12 +16,15 @@ class CustomTheme extends StatelessWidget {
   Widget build(BuildContext context) {
     return Theme(
         data: ThemeData(
-            cardTheme: CardTheme(color: Colors.red, elevation: 4),
-            dividerTheme: DividerThemeData(
-                color: Colors.blue,
-                thickness: 2
+            cardTheme: const CardTheme(
+              color: Colors.red,
+              elevation: 4,
             ),
-            sliderTheme: SliderThemeData(
+            dividerTheme: const DividerThemeData(
+              color: Colors.blue,
+              thickness: 2,
+            ),
+            sliderTheme: const SliderThemeData(
               thumbColor: Colors.red,
               activeTrackColor: Colors.green,
               inactiveTrackColor: Colors.grey,
@@ -37,9 +40,13 @@ class CustomTheme extends StatelessWidget {
                 ),
               ),
               Container(
-                  width: 150,
-                  child: Slider(value: 0.8, onChanged: (v) => {})),
-              Container(  width: 150,child: Divider())
+                width: 150,
+                child: Slider(value: 0.8, onChanged: null),
+              ),
+              Container(
+                width: 150,
+                child: const Divider(),
+              )
             ]));
   }
 }
\ No newline at end of file
diff --git a/lib/views/widgets/StatelessWidget/Title/node1_base.dart b/lib/views/widgets/StatelessWidget/Title/node1_base.dart
index 63d00e2..35ffab2 100644
--- a/lib/views/widgets/StatelessWidget/Title/node1_base.dart
+++ b/lib/views/widgets/StatelessWidget/Title/node1_base.dart
@@ -16,9 +16,12 @@ class TitleDemo extends StatelessWidget {
   Widget build(BuildContext context) {
     return Container(
       child: Title(
-          title: '张风捷特烈',
-          color: Color(0xFF9C27B0),
-          child: Center(child: Text('应用菜单栏中该页的名称为: 张风捷特烈'))),
+        title: '张风捷特烈',
+        color: const Color(0xFF9C27B0),
+        child: const Center(
+          child: Text('应用菜单栏中该页的名称为: 张风捷特烈'),
+        ),
+      ),
     );
   }
 }
diff --git a/lib/views/widgets/StatelessWidget/ToggleButtons/node1_single.dart b/lib/views/widgets/StatelessWidget/ToggleButtons/node1_single.dart
index 9c265ee..a66cdfd 100644
--- a/lib/views/widgets/StatelessWidget/ToggleButtons/node1_single.dart
+++ b/lib/views/widgets/StatelessWidget/ToggleButtons/node1_single.dart
@@ -20,15 +20,15 @@ class CustomToggleButtons extends StatefulWidget {
 }
 
 class _CustomToggleButtonsState extends State<CustomToggleButtons> {
-  var _isSelected = [true, false, false];
+  List<bool> _isSelected = [true, false, false];
 
   @override
   Widget build(BuildContext context) {
     return ToggleButtons(
-      children: <Widget>[
-        Icon(Icons.skip_previous),
-        Icon(Icons.pause),
-        Icon(Icons.skip_next),
+      children: const <Widget>[
+         Icon(Icons.skip_previous),
+         Icon(Icons.pause),
+         Icon(Icons.skip_next),
       ],
       borderWidth: 1,
       borderRadius: BorderRadius.circular(10),
diff --git a/lib/views/widgets/StatelessWidget/ToggleButtons/node2_color.dart b/lib/views/widgets/StatelessWidget/ToggleButtons/node2_color.dart
index be46eeb..697469f 100644
--- a/lib/views/widgets/StatelessWidget/ToggleButtons/node2_color.dart
+++ b/lib/views/widgets/StatelessWidget/ToggleButtons/node2_color.dart
@@ -22,11 +22,12 @@ class ColorToggleButtons extends StatefulWidget {
 }
 
 class _ColorToggleButtonsState extends State<ColorToggleButtons> {
-  var _isSelected = [true, false, false];
+  List<bool> _isSelected = [true, false, false];
+
   @override
   Widget build(BuildContext context) {
     return ToggleButtons(
-      children: <Widget>[
+      children: const <Widget>[
         Icon(Icons.skip_previous),
         Icon(Icons.pause),
         Icon(Icons.skip_next),
diff --git a/lib/views/widgets/StatelessWidget/ToggleButtons/node3_multi.dart b/lib/views/widgets/StatelessWidget/ToggleButtons/node3_multi.dart
index cea4cb8..95d2b97 100644
--- a/lib/views/widgets/StatelessWidget/ToggleButtons/node3_multi.dart
+++ b/lib/views/widgets/StatelessWidget/ToggleButtons/node3_multi.dart
@@ -17,11 +17,12 @@ class ProToggleButtons extends StatefulWidget {
 }
 
 class _ProToggleButtonsState extends State<ProToggleButtons> {
-  var _isSelected = [false, false, false];
+  List<bool> _isSelected = [false, false, false];
+
   @override
   Widget build(BuildContext context) {
     return ToggleButtons(
-      children: <Widget>[
+      children: const <Widget>[
         Icon(Icons.skip_previous),
         Icon(Icons.pause),
         Icon(Icons.skip_next),