flutter type '_internallinkedhashmap<string, dynamic>' is not a subtype of t

import 'dart:convert';

void main() {
  String jsonString = '{"name": "John", "age": 30}';
  Map<String, dynamic> data = jsonDecode(jsonString);

  // 正确使用类型断言
  Person person = Person.fromJson(data);
  print(person.name); // 输出: John
}

class Person {
  final String name;
  final int age;

  Person({required this.name, required this.age});

  factory Person.fromJson(Map<String, dynamic> json) {
    return Person(
      name: json['name'] as String,
      age: json['age'] as int,
    );
  }
}

Map<String, dynamic> data = {'key': 'value'};
// 错误的类型断言
List<dynamic> list = data as List<dynamic>; // 这会抛出异常

// 正确的做法
if (data is Map<String, dynamic>) {
  // 处理Map
} else if (data is List<dynamic>) {
  // 处理List
}

void processData<T>(T data) {
  if (data is Map<String, dynamic>) {
    // 处理Map
  } else if (data is List<dynamic>) {
    // 处理List
  }
}

void main() {
  Map<String, dynamic> mapData = {'key': 'value'};
  List<dynamic> listData = [1, 2, 3];

  processData(mapData); // 正确
  processData(listData); // 正确
}