node 多重监听

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添加监听： emitter.addListener('connection',listen1); / emitter.on('connection',listen2);

解除监听： emitter.removeListener('connection',listen1);

触发监听： emitter.on('connection',listen2);

var event = require('events');

var emitter = new event.EventEmitter();
function listen1(){ console.log('listen1') }
function listen2(){ console.log('listen2') }
emitter.addListener('connection',listen1);
emitter.on('connection',listen2);
var listenCount = require('events').EventEmitter.listenerCount(emitter,'connection');
console.log(listenCount); // 2

emitter.emit('connection'); // listen1监听 listen2监听 true

emitter.removeListener('connection',listen1); // listen1 不在监听
listenCount = require('events').EventEmitter.listenerCount(emitter,'connection');

console.log(listenCount); // 1

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