// main.dartimport'package:flutter/material.dart';// 引入路由管理import'routes/Routes.dart';// 主函数voidmain(){runApp(MyApp());}classMyAppextendsStatelessWidget{@override Widgetbuild(BuildContext context){returnMaterialApp(// 初始化的路由initialRoute:'/',// 监听路由事件onGenerateRoute:onGenerate...
Function fun2= (String str) => str.trim().toLowerCase();//可以函数对象的入参,不过好像没有检查,可能会引发启动错误//下面我们再看下常用的一些修饰词//final 目前来看和java差不多finalString finalStr = "这是一个不可修改的字符串";//static 目前来看和java差不多staticString staticStr = "这是...
String ->> _asyncfoo");}voidblockfoo(){print("== start ==");_blockfoo((value){print(value);});print("== end ==");}// 通过 <回调函数> 构造异步回调Future<void>_blockfoo(Function(String)callback)async{awaitFuture.delayed(constDuration(seconds:2));callback("Result String ->> _...
delayed(Duration(seconds: 2));//模拟耗时 print('加载结束--${DateTime.now().toIso8601String()}'); return String.fromCharCodes(first.map((e) => e + count)); } 代码语言:javascript 复制 加载开始--2020-05-20T07:28:28.394205 加载结束--2020-05-20T07:28:30.409498 👿加载开始--2020-05...
参数test(foo);//传入的name:lilei//将函数作为另一个函数的返回值varfunc=getFunc();func("Dart");//传入的name:Dart}//定义一个函数foo(Stringname){print("传入的name:$name");}//将函数作为另一个函数的参数test(Functionfunc){func("lilei");}//将函数作为另一个函数的返回值getFunc(){return...
void main() { Function f = isZero; int x = 10; int y = 10; printInfo(x, f); printInfo(y, f); enable1Flags(bold: true); } bool isZero(int a) { return a == 0; } bool isNull(var a) => a == null; void printInfo(int number, Function check) { print('$number is ...
return Text('Error: ${snapshot.error}'); } else { return Text(''); } } @override Widget build(BuildContext context) { String toLaunch = 'https://flutter.dev'; return Scaffold( appBar: AppBar( title: Text(widget.title), ), ...
String:字符串类型,可用 "", '', ``表示。其中``用于字符串模板,比如:`1 + 2 = ${1+2}` Symbol:符号类型,用于定义匿名且唯一的值,一般用作 Object 属性的 key Object 其中7 个基本类型的值是不可变的(immutable value)。Object 用来定义复杂数据类型,JS内置了一些复杂类型比如:Function、Date、Array、Ma...
Nested generic function inside factory constructor crashes flutter run (web) compiler #160338 commented on Dec 18, 2024 • 0 new comments [ios] Flutter view can't refresh in Pip when app in background. #158913 commented on Dec 18, 2024 • 0 new comments iOS Voice Control number...
=EVENT_DANIULIVE_PLAYER_SDK | 0x82;static const EVENT_DANIULIVE_ERC_PLAYER_STOP_BUFFERING =EVENT_DANIULIVE_PLAYER_SDK | 0x83;static const EVENT_DANIULIVE_ERC_PLAYER_DOWNLOAD_SPEED =EVENT_DANIULIVE_PLAYER_SDK | 0x91;}typedef SmartEventCallback = void Function(int, String, String, String);class...