emitter.prependOnceListener(eventName, listener)

• eventName <string> | <symbol> 事件的名称。
• listener <Function> 回调函数
• 返回：<EventEmitter>

为名为 eventName 的事件在监听器数组的开头添加一个一次性的 listener 函数。下次触发 eventName 时，这个监听器会被移除，然后执行。

🌐 Adds a one-time listener function for the event named eventName to the beginning of the listeners array. The next time eventName is triggered, this listener is removed, and then invoked.

server.prependOnceListener('connection', (stream) => {
  console.log('Ah, we have our first user!');
}); 拷贝

返回 EventEmitter 的引用，以便可以进行链式调用。

🌐 Returns a reference to the EventEmitter, so that calls can be chained.