Domain 类

• 继承自: <EventEmitter>

Domain 类封装了路由错误和未捕获异常到活动 Domain 对象的功能。

要处理其捕获的错误，则监听其 'error' 事件。

• Extends: <EventEmitter>

The Domain class encapsulates the functionality of routing errors and uncaught exceptions to the active Domain object.

To handle the errors that it catches, listen to its 'error' event.