Flutter开发之Dart语言

import 'package:flutter/material.dart';
void main()=>runApp(myapp());
class myapp extends StatelessWidget{
  @override 
  Widget build(BuildContext context) {
    return MaterialApp(
      title:'welcome to flutter',
      home:Scaffold(
        appBar:AppBar(
          title: Text('welcome to flutter'),
        ),  //AppBar
        body:Center(
          child: Text('hello world'),
        )  //Center
      )  //Scaffold
    );  //MaterialApp
  }
}

运行结果：