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Multithreading多线程

With Web Workers, it is possible to run JavaScript in OS-level threads.使用Web Workers，可以在操作系统级线程中运行JavaScript。

Multi-threaded Node.js多线程Node.js​

It is possible to use Node.js features in Electron's Web Workers, to do so the nodeIntegrationInWorker option should be set to true in webPreferences.可以在Electron的Web Workers中使用Node.js功能，为此，应在webPreferences中将nodeIntegrationInWorker选项设置为true。

const win = new BrowserWindow({
  webPreferences: {
    nodeIntegrationInWorker: true
  }
})

The nodeIntegrationInWorker can be used independent of nodeIntegration, but sandbox must not be set to true.nodeIntegrationInWorker可以独立于nodeIntegration使用，但sandbox不能设置为true。

Available APIs可用的API​

All built-in modules of Node.js are supported in Web Workers, and asar archives can still be read with Node.js APIs. Web Workers支持Node.js的所有内置模块，并且仍然可以使用Node.js API读取asar存档。However none of Electron's built-in modules can be used in a multi-threaded environment.然而，Electron的内置模块都不能在多线程环境中使用。

Native Node.js modules原生Node.js模块​

Any native Node.js module can be loaded directly in Web Workers, but it is strongly recommended not to do so. 任何本机Node.js模块都可以直接加载到Web Workers中，但强烈建议不要这样做。Most existing native modules have been written assuming single-threaded environment, using them in Web Workers will lead to crashes and memory corruptions.大多数现有的本机模块都是在假设单线程环境下编写的，在Web Workers中使用它们将导致崩溃和内存损坏。

Note that even if a native Node.js module is thread-safe it's still not safe to load it in a Web Worker because the process.dlopen function is not thread safe.请注意，即使本机Node.js模块是线程安全的，将其加载到Web工作器中仍然不安全，因为processdlopen函数不是线程安全的。

The only way to load a native module safely for now, is to make sure the app loads no native modules after the Web Workers get started.目前安全加载本机模块的唯一方法是确保在Web工作程序启动后，应用程序不会加载本机的模块。

process.dlopen = () => {
  throw new Error('Load native module is not safe')
}
const worker = new Worker('script.js')