after(asyncId)

在 before 中指定的回调完成后立即调用。

🌐 Called immediately after the callback specified in before is completed.

如果在回调执行期间发生未捕获的异常，那么 after 会在 'uncaughtException' 事件被触发或者 domain 的处理程序运行之后执行。

🌐 If an uncaught exception occurs during execution of the callback, then after will run after the 'uncaughtException' event is emitted or a domain's handler runs.