1 // var events = require("events").EventEmitter();//老式写法
 2 var events = require("events");
 3 var util = require("util");
 4 function Goddess(){
 5     //女神类，会触发一些事件,比如饿了
 6 }
 7 function Boy(name,response){
 8     this.name = name;
 9     this.response = response;
10 }
11 util.inherits(Goddess,events);//继承事件的各种方法和属性
12 
13 var girl = new Goddess();
14 var boy1 = new Boy("备胎1",function(){
15    console.log("吃鸡腿");
16 });
17 var boy2 = new Boy("备胎2",function(){
18     console.log("吃牛排");
19 });
20 
21 
22 girl.setMaxListeners(3);//设置最大事件数
23 //添加事件
24 girl.on("ele",boy1.response);
25 girl.addListener("ele",function(){
26     console.log("自己做点吃的");
27 });
28 girl.on("ele",boy2.response);
29 girl.once("die",function(){
30     console.log("死了");
31 });
32 // girl.removeListener("ele",boy1.response);//移除事件
33 girl.removeAllListeners("ele");//移除ele
34 //发射事件
35 girl.emit("ele");
36 girl.emit("die");
37 girl.emit("ele");
38 girl.emit("die");