在DART中是否可能有配置文件？

我有一个JavaScript类：

'use strict;'
/* global conf */

var properties = {
    'PROPERTIES': {
        'CHANNEL': 'sport',
        'VIEW_ELEMENTS': {
            'LOADER_CLASS': '.loader',
            'SPLASH_CLASS': '.splash'
        }
    }
};

在JavaScript中，我可以使用以下属性：

properties.properties.CHANNEL

---

是否可以将此转换为DART？有没有最好的方法可以做到这一点？

有不同的方法

你可以创建一张地图

my_config.dart

const Map properties = const {
  'CHANNEL': 'sport',
  'VIEW_ELEMENTS': const {
    'LOADER_CLASS': '.loader',
    'SPLASH_CLASS': '.splash'
  }
}

import 'my_config.dart';

main() {
  print(properties['VIEW_ELEMENTS']['SPLASH_CLASS']);
}

const properties = const Properties('sport', const ViewElements('.loader', '.splash'));

class Properties {
  final String channel;
  final ViewElements viewElements;
  const Properties(this.channel, this.viewElements;
}

class ViewElements {
  final String loaderClass;
  final String splashClass;
  const ViewElements(this.loaderClass, this.splashClass);
}

import 'my_config.dart';

main() {
  print(properties.viewElements.splashClass);
}

然后像这样使用它

main.dart

const Map properties = const {
  'CHANNEL': 'sport',
  'VIEW_ELEMENTS': const {
    'LOADER_CLASS': '.loader',
    'SPLASH_CLASS': '.splash'
  }
}

import 'my_config.dart';

main() {
  print(properties['VIEW_ELEMENTS']['SPLASH_CLASS']);
}

const properties = const Properties('sport', const ViewElements('.loader', '.splash'));

class Properties {
  final String channel;
  final ViewElements viewElements;
  const Properties(this.channel, this.viewElements;
}

class ViewElements {
  final String loaderClass;
  final String splashClass;
  const ViewElements(this.loaderClass, this.splashClass);
}

import 'my_config.dart';

main() {
  print(properties.viewElements.splashClass);
}

或者您可以使用类来获得正确的自动完成和类型检查

my_config.dart

const Map properties = const {
  'CHANNEL': 'sport',
  'VIEW_ELEMENTS': const {
    'LOADER_CLASS': '.loader',
    'SPLASH_CLASS': '.splash'
  }
}

import 'my_config.dart';

main() {
  print(properties['VIEW_ELEMENTS']['SPLASH_CLASS']);
}

const properties = const Properties('sport', const ViewElements('.loader', '.splash'));

class Properties {
  final String channel;
  final ViewElements viewElements;
  const Properties(this.channel, this.viewElements;
}

class ViewElements {
  final String loaderClass;
  final String splashClass;
  const ViewElements(this.loaderClass, this.splashClass);
}

import 'my_config.dart';

main() {
  print(properties.viewElements.splashClass);
}

main.dart

const Map properties = const {
  'CHANNEL': 'sport',
  'VIEW_ELEMENTS': const {
    'LOADER_CLASS': '.loader',
    'SPLASH_CLASS': '.splash'
  }
}

import 'my_config.dart';

main() {
  print(properties['VIEW_ELEMENTS']['SPLASH_CLASS']);
}

const properties = const Properties('sport', const ViewElements('.loader', '.splash'));

class Properties {
  final String channel;
  final ViewElements viewElements;
  const Properties(this.channel, this.viewElements;
}

class ViewElements {
  final String loaderClass;
  final String splashClass;
  const ViewElements(this.loaderClass, this.splashClass);
}

import 'my_config.dart';

main() {
  print(properties.viewElements.splashClass);
}

---

在使用类实现上述答案之后，实现静态变量可能很方便，但缺点是仍然必须编译/重建静态变量

class CONFIG {
  static final String BUILD = "Release";
  static final String DEPLOYMENT = "None";
}

通过以下方式导入后，可以从单独的类中使用：

var xyz = CONFIG.BUILD;

---

我也会选择第二种，但来自JS的人通常喜欢较少的课程。但是，如果对浏览器应用程序使用这些解决方案之一，则需要使用应用程序编译配置。