将下列内容保存为 hello.dart

import 'dart:convert';


String jsonString = '''
{
  "name": "John Smith",
  "email": "john@example.com"
}
''';



void main() {

    Map user = jsonDecode(jsonString);

    print('Howdy, ${user['name']}!');
    print('We sent the verification link to ${user['email']}.');
}

运行
dart hello.dart