emitter.listeners(eventName)


返回名为 eventName 的事件的监听器数组的副本。

server.on('connection', (stream) => {
  console.log('有连接');
});
console.log(util.inspect(server.listeners('connection')));
// 打印: [ [Function] ]

Returns a copy of the array of listeners for the event named eventName.

server.on('connection', (stream) => {
  console.log('someone connected!');
});
console.log(util.inspect(server.listeners('connection')));
// Prints: [ [Function] ]