大家好，我是坚果，我的公众号“坚果前端”，
今天教大家
用 vscode 创建第一个项目
创建新项目
在安装了 Flutter 扩展的 VS Code 中，通过选择 View ▸ Command Palette...或在 macOS 上按 Command-Shift-P 或在 Linux 或 Windows 上按 Control-Shift-P 打开命令面板。在面板中输入 Flutter: New 并按 Return。
默认第一个。直接按 return
这个时候选择一个文件夹创建。
然后返回这个界面。给自己的项目命名。
这个就是创建后的项目结构
启动调试
运行-启动调试
我没有连真机，所以显示的是我安装的浏览器
然后直接运行，VSCode 只需要按 F5 快捷键就行了。
然后你就可以看到 VSCode 弹出一个框让你选择运行项目的环境：
老铁，听我说，选 “ Dart & Flutter ” 就对了。
然后稍等一下吧，项目会编译，然后自动生成内容，其实就是 Dart 转换成 JavaScript 的过程。
Dart 原本就是（谷歌）想代替 JavaScript 而发明的，可以转换成 JavaScript 代码。
感觉 Dart 走了曲线救国的方式，终于走到这步 —— 代替 JavaScript。
最后，你会看到你系统默认的浏览器会弹出一个新的窗口来运行你的项目。（感觉刚开始有点慢吧。。。。）
下面我们来看看项目的目录：
web/index.html
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title></title> <script defer src="main.dart.js" type="application/javascript"></script></head><body></body></html>
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web/main.dart
// Copyright 2019 The Chromium Authors. All rights reserved.// Use of this source code is governed by a BSD-style license that can be// found in the LICENSE file.import 'package:flutter_web_ui/ui.dart' as ui;import 'package:aaaaaaa/main.dart' as app;
main() async { await ui.webOnlyInitializePlatform(); app.main();}
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lib/main.dart
import 'package:flutter_web/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: MyHomePage(title: 'Flutter Demo Home Page'), ); }}
class MyHomePage extends StatelessWidget { MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override Widget build(BuildContext context) { // The Flutter framework has been optimized to make rerunning build methods // fast, so that you can just rebuild anything that needs updating rather // than having to individually change instances of widgets. return Scaffold( appBar: AppBar( title: Text(title), ), body: Center( // Center is a layout widget. It takes a single child and positions it // in the middle of the parent. child: Column( // Column is also layout widget. It takes a list of children and // arranges them vertically. By default, it sizes itself to fit its // children horizontally, and tries to be as tall as its parent. // // Invoke "debug painting" (choose the "Toggle Debug Paint" action // from the Flutter Inspector in Android Studio, or the "Toggle Debug // Paint" command in Visual Studio Code) to see the wireframe for each // widget. // // Column has various properties to control how it sizes itself and // how it positions its children. Here we use mainAxisAlignment to // center the children vertically; the main axis here is the vertical // axis because Columns are vertical (the cross axis would be // horizontal). mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text( 'Hello, World!', ), ], ), ), // This trailing comma makes auto-formatting nicer for build methods. ); }}
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本文就大致介绍到这里吧，不管怎么说 Flutter 跑在 Web 上面而且不是试验性质的，是正式版的，这是令人多么激动无比啊，我也情不自禁为其写下一篇相关文章。
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