事件：'listening'

¥Event: 'listening'

• worker <cluster.Worker>

• address <Object>

从工作进程调用 listen() 后，当服务器上触发 'listening' 事件时，则主进程中的 cluster 也将触发 'listening' 事件。

¥After calling listen() from a worker, when the 'listening' event is emitted on the server, a 'listening' event will also be emitted on cluster in the primary.

事件处理程序使用两个参数执行，worker 包含工作对象，address 对象包含以下连接属性：address、port 和 addressType。如果工作进程正在监听多个地址，则这将非常有用。

¥The event handler is executed with two arguments, the worker contains the worker object and the address object contains the following connection properties: address, port, and addressType. This is very useful if the worker is listening on more than one address.

cluster.on('listening', (worker, address) => {
  console.log(
    `A worker is now connected to ${address.address}:${address.port}`);
}); 拷贝

addressType 是以下之一：

¥The addressType is one of:

• 4(TCPv4)

• 6(TCPv6)

• -1(Unix 域套接字)

  ¥-1 (Unix domain socket)

• 'udp4' 或 'udp6'（UDPv4 或 UDPv6）

  ¥'udp4' or 'udp6' (UDPv4 or UDPv6)