Add:创建 flutter go web 版

lib/widgets/elements/Form/Button/RawMaterialButton/demo.dart

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+/// Created with Android Studio.
+/// User: 一晟
+/// Date: 2018/11/22
+/// Time: 上午12:03
+/// email: zhu.yan@alibaba-inc.com
+/// target: RawMaterialButton 的示例
+
+import 'dart:math';
+
+import 'package:flutter_web/material.dart';
+
+// RawMaterialButton 默认按钮的实例
+// isDisabled:是否是禁用，isDisabled 默认为true
+
+class RawMaterialButtonDefault extends StatelessWidget {
+  final bool isDisabled;
+
+  const RawMaterialButtonDefault([ this.isDisabled = true])
+      : assert(isDisabled != null),
+        super();
+
+  @override
+  Widget build(BuildContext context) {
+    return RawMaterialButton(
+        // 文本内容
+        child: const Text('默认按钮', semanticsLabel: 'FLAT BUTTON 1'),
+        onPressed: isDisabled ? () {} : null);
+  }
+}
+
+// RawMaterialButton 自定义的实例
+class RawMaterialButtonCustom extends StatelessWidget {
+  final String txt;
+  final Color color;
+  final ShapeBorder shape;
+  final VoidCallback onPressed;
+
+  const RawMaterialButtonCustom(
+      [ this.txt = '自定义按钮',
+       this.color = Colors.blueAccent,
+       this.shape,
+       this.onPressed])
+      : super();
+
+  @override
+  Widget build(BuildContext context) {
+    final _onPressed = onPressed;
+    final _fontSize = (Random.secure().nextInt(10)+15).toDouble();
+    return RawMaterialButton(
+        // 使用Material.textStyle为按钮的子项定义默认文本样式。
+        textStyle:TextStyle(color: _randomColor(),fontSize: _fontSize),
+        // 定义形状和高程的动画更改的持续时间
+        animationDuration:Duration(seconds: 1),
+        // 文本内容
+        child: Text(txt, semanticsLabel: 'FLAT BUTTON 2'),
+        // 高亮时的背景色
+        highlightColor: Colors.yellow,
+        // 按钮内部,墨汁飞溅的颜色,点击按钮时的渐变背景色，当你不设置高亮背景时才会看的更清楚
+        splashColor: _randomColor(),
+        // 抗锯齿能力,抗锯齿等级依次递增,none（默认),hardEdge,antiAliasWithSaveLayer,antiAlias
+        clipBehavior: Clip.antiAlias,
+        padding:  EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
+        //高亮时候的阴影
+        highlightElevation: 10.0,
+        // 按钮材质的形状
+        // shape: shape,
+        // RawMaterialButton 的点击事件
+        onPressed: () {
+          // Perform some action
+          if (_onPressed is VoidCallback) {
+            _onPressed();
+          }
+        });
+  }
+}
+
+Color _randomColor() {
+  var red = Random.secure().nextInt(255);
+  var greed = Random.secure().nextInt(255);
+  var blue = Random.secure().nextInt(255);
+  return Color.fromARGB(255, red, greed, blue);
+}