var events = require('events');
// util 是一个 node 核心工具库，包含很多功能
var util = require('util');

var Person = function(name) { // 定义一个 Person 类
this.name = name
}

// Person 继承于 events.EventEmitter
util.inherits(Person, events.EventEmitter);

// 新建三个对象
var xiaoming = new Person('xiaoming');
var lili = new Person('lili');
var lucy = new Person('lucy');

var person = [xiaoming, lili, lucy];

person.forEach(function(person) {
// 给每个人绑定一个事件
person.on('speak', function(message) {
console.log(person.name + " said: " + message);
})
})

// 触发事件：
xiaoming.emit('speak', 'hi');
lucy.emit('speak', 'I want a curry');