varmap1={'aa':'aaa','bb':'bbb','cc':true};//直接赋值初始值print(map1);//{aa: aaa, bb: bbb, cc: true}Map map2={'a':'a1','b':'b1'};//直接赋值初始值print(map2);//{a: a1, b: b1}map2['c']='c1';print(map2);//{a: a1, b: b1, c: c1}varmap3=newMap();...
// 1.根据key获取value print(infoMap1['name']); // why // 2.获取所有的entries print('${infoMap1.entries} ${infoMap1.entries.runtimeType}'); // (MapEntry(name: why), MapEntry(age: 18)) MappedIterable<String, MapEntry<String, Object>> // 3.获取所有的keys print('${infoMap1.keys...
'${map7.values},${map7.values.runtimeType}'); //(1, 2, 3),_CompactIterable<int> Map的所有value print( '${map7.entries},${map7.entries.runtimeType}'); // (MapEntry(a7: 1), MapEntry(b7: 2), MapEntry(c7: 3)),MappedIterable<String, MapEntry<String, int> Map的所有键值对 ...
Map<String ,int> map14 = {'a14':1}; bool resultMap14 = map14.containsKey('a11'); //false bool resultMap141 = map14.containsValue(1); //true forEach(void f(K key, V value)) 遍历Map ,遍历时不可add或者remove 代码语言:javascript 复制 Map<String, int> map15 = {'a15': 1, 'b15...
static Map<String, Map<String, String>> _localizedValues = { "en": { "title": "home", "greet": "hello~", "picktime": "Pick a Time" }, "zh": { "title": "首页", "greet": "你好~", "picktime": "选择一个时间" }
formData.files.addAll([ MapEntry("files", MultipartFile.fromFileSync("./example/upload.txt", filename:"upload.txt"), ), MapEntry("files", MultipartFile.fromFileSync("./example/upload.txt", filename:"upload.txt"), ), ]); 这样构建的FormData的key是不会有“[]”。
2.Map类型的遍历 3.Map类型之间传值 7.dynamic、var、Object三者的区别 1.个人认为dynamic,object两个和var的还是很容易区别的,如下图: 2.dynamic,object的区别,`dynamic与Object的最大的区别是在静态类型检查上` 这个我学习Flutter的第二天,因为学习Flutter的肯定得学习Dart语言,Dart是Flutter的主要开发语言。我的...
import 'package:dio/dio.dart'; import 'dart:io'; void uploadFile() async { Dio dio = Dio(); FormData formData = FormData(); formData.files.add(MapEntry( "file", await MultipartFile.fromFile(File("path/to/file.jpg").path), )); formData.fields.add(MapEntry("param1", "value1"...
("assets/json/i18n.json");// 2.转成map类型final Map<String, dynamic> map = json.decode(jsonString);// 3.注意:这里是将Map<String, dynamic>转成Map<String, Map<String, String>>类型_localizedValues = map.map((key, value) {return MapEntry(key, value.cast<String, String>());});...
// Map的操作// 1.根据key获取valueprint(infoMap1['name']); // why// 2.获取所有的entriesprint('${infoMap1.entries} ${infoMap1.entries.runtimeType}'); // (MapEntry(name: why), MapEntry(age: 18)) MappedIterable<String, MapEntry<String, Object>>// 3.获取所有的keysprint('${infoMap...