如何确定我的 React Native 应用程序是基于 JavaScript 代码的调试版本还是发布版本？
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How can I determine if my React Native app is a debug or release build from JavaScript code?
提问by escouten
I'd like to add some debug-only UI to my React Native app, but I can't find any equivalent of RCT_DEBUGor RCT_DEVcompile-time flags in the JavaScript environment. Is there one?
我想向我的 React Native 应用程序添加一些仅用于调试的 UI，但在 JavaScript 环境中找不到任何等效的RCT_DEBUG或RCT_DEV编译时标志。有吗？
Use case: I want to add a status bar that shows the number of HTTP requests initiated by my app. Obviously this is not part of a shipping app, but it would help me check my work while in development and testing.
用例：我想添加一个状态栏，显示我的应用程序发起的 HTTP 请求数。显然，这不是发布应用程序的一部分，但它可以帮助我在开发和测试过程中检查我的工作。
回答by rmevans9
if (__DEV__) {
console.log('I am in debug');
}
You can see this approachis being used in React Native repository.
