如何在 React Native android 中打开性能优化？

Question

每当我运行我的应用程序时，我总是在我的开发者工具中看到

DEV === true，开发级警告开启，性能优化关闭

如何将性能优化设置为 ON 并将 DEV 设置为 False？

Answer 1

当您创建生产 JavaScript 包时，DEV 模式会自动关闭。通常您不需要自己执行此操作，因为打包程序会在您运行 XCode 存档任务或 Android 部署时创建包。

但是，您可以使用react-native bundle --dev=false 命令手动创建捆绑包，例如

react-native bundle --dev=false --entry-file=index.ios.js --bundle-output=app.jsbundle --platform=ios

bundle 命令采用以下选项：

react-native bundle [options]
builds the javascript bundle for offline use

Options:

  -h, --help                   output usage information
  --entry-file <path>          Path to the root JS file, either absolute or relative to JS root
  --platform [string]          Either "ios" or "android"
  --transformer [string]       Specify a custom transformer to be used
  --dev [boolean]              If false, warnings are disabled and the bundle is minified
  --bundle-output <string>     File name where to store the resulting bundle, ex. /tmp/groups.bundle
  --bundle-encoding [string]   Encoding the bundle should be written in (https://nodejs.org/api/buffer.html#buffer_buffer).
  --sourcemap-output [string]  File name where to store the sourcemap file for resulting bundle, ex. /tmp/groups.map
  --assets-dest [string]       Directory name where to store assets referenced in the bundle
  --verbose                    Enables logging
  --reset-cache                Removes cached files
  --read-global-cache          Try to fetch transformed JS code from the global cache, if configured.
  --config [string]            Path to the CLI configuration file