node.js中的events.emitter.listeners方法使用说明

emitter.listeners(event)

server.on('connection', function (stream) {

  console.log('someone connected!');

});

console.log(util.inspect(server.listeners('connection'))); 

// [ [Function] ]

EventEmitter.prototype.listeners = function(type) {

  var ret;

  if (!this._events || !this._events[type])

    ret = [];

  else if (util.isFunction(this._events[type]))

    ret = [this._events[type]];

  else

    ret = this._events[type].slice();

  return ret;

};