如何使用dart解码以下类型的json

import 'dart:convert';

void main() {
  String jsonString = '{"name": "John", "age": 30, "city": "New York"}';
  Map<String, dynamic> jsonData = json.decode(jsonString);
  
  print('Name: ${jsonData["name"]}');
  print('Age: ${jsonData["age"]}');
  print('City: ${jsonData["city"]}');
}

import 'dart:convert';

void main() {
  String jsonString = '{"fruits": ["apple", "banana", "orange"]}';
  Map<String, dynamic> jsonData = json.decode(jsonString);
  
  List<dynamic> fruits = jsonData["fruits"];
  fruits.forEach((fruit) => print(fruit));
}

import 'dart:convert';

void main() {
  String jsonString = '{"person": {"name": "John", "age": 30}}';
  Map<String, dynamic> jsonData = json.decode(jsonString);
  
  Map<String, dynamic> person = jsonData["person"];
  print('Name: ${person["name"]}');
  print('Age: ${person["age"]}');
}