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doc: update dart.md (#806)

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* doc: update dart.md

* doc: update dart.md

完善 import 部分内容

* doc: update dart.md

修正翻译错误，将 “地图” 修改为 “映射”
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Apin 2024-07-25 00:03:03 +08:00 committed by GitHub
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1 changed files with 13 additions and 4 deletions
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@ -90,8 +90,8 @@ double height = 1.85;
// 您还可以将变量声明为 num // 您还可以将变量声明为 num
// x 可以同时具有 int 和 double 值 // x 可以同时具有 int 和 double 值
num x = 1; num x = 1;
num += 2.5; x += 2.5;
print(num); // 打印: 3.5 print(x); // 打印: 3.5
String name = "Nicola"; String name = "Nicola";
bool isFavourite = true; bool isFavourite = true;
@ -132,6 +132,15 @@ import 'dart:math';
import 'package:test/test.dart'; import 'package:test/test.dart';
// 导入文件 // 导入文件
import 'path/to/my_other_file.dart'; import 'path/to/my_other_file.dart';
// 指定前缀
import 'package:lib/lib.dart' as lib;
lib.Element element = lib.Element();
// 仅导入 foo
import 'package:lib1/lib1.dart' show foo;
// 不导入 foo
import 'package:lib2/lib2.dart' hide foo;
// 延迟导入，仅在需要时导入
import 'package:greetings/hello.dart' deferred as hello;
``` ```
操作符 操作符
@ -372,7 +381,7 @@ const constantCities = const ["New York", "Mumbai", "Tokyo"];
```dart ```dart
// 映射是关联键和值的对象 // 映射是关联键和值的对象
var person = Map<String, String>(); var person = Map<String, String>();
// 要初始化地图，请执行以下操作： // 要初始化映射，请执行以下操作：
person['firstName'] = 'Nicola'; person['firstName'] = 'Nicola';
person['lastName'] = 'Tesla'; person['lastName'] = 'Tesla';
print(person); print(person);
@ -397,7 +406,7 @@ var halogens = {'fluorine', 'chlorine', 'bromine', 'iodine', 'astatine'};
// 创建一个空集 // 创建一个空集
var names = <String>{}; var names = <String>{};
Set<String> names = {}; // 这也有效 Set<String> names = {}; // 这也有效
//var names = {}; // 创建地图，而不是集合 //var names = {}; // 创建映射，而不是集合
``` ```
函数 函数