React Native 中 Java 单例的等价物是什么? [英] What is the equivalent of Java singleton in React Native?

问题描述

其实我是一个安卓原生开发者.我是 React-Native 的新手.在 Java 中，我将用户数据和其他数据保存在 Singleton 类中，并从其他活动访问.然后我如何在 React Native 中实现这个过程，以访问来自其他组件的数据或 React Native 中单例的任何替代方案.

Actually I am a Android Native Developer. I am new to React-Native. In Java i keep the users data and others data in Singleton Class and access from other activities. Then how i achieve this process in React native for access data's from other components or any alternative of singleton in React native.

我只是尝试这个，但我收到了类似 getInstance() 未定义的错误.

I just try this but i received the error like getInstance() not defined.

class AppDelegate {
log = "This is AppDelegate";  

  static myInstance = null;
  static getInstance() {
    if (AppDelegate.myInstance == null) {
      AppDelegate.myInstance = new AppDelegate();
    }

    return this.myInstance;
  }

}

谢谢.

推荐答案

导入被缓存，所以如果你导出一个类，这个类会被缓存，如果你导出一个实例，实例将被缓存

Imports are cached, so if you export a class, the class will be cached, if you export an instance, the instance will be cached

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