process.channel.ref()

如果之前调用了 .unref()，此方法会使 IPC 通道保持进程的事件循环运行。

【This method makes the IPC channel keep the event loop of the process running if .unref() has been called before.】

通常，这是通过在 process 对象上设置 'disconnect' 和 'message' 监听器的数量来管理的。然而，这种方法可以用来明确请求某种特定的行为。

【Typically, this is managed through the number of 'disconnect' and 'message' listeners on the process object. However, this method can be used to explicitly request a specific behavior.】