Node.js publish-subscribe model example explanation

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The examples are as follows:

//导入内置模块
let EventEmitter = require('events');
let util=require('util');
//Man继承EventEmitter
util.inherits(Man,EventEmitter); 
//创建一个函数
function Man(){}
//实例化函数
let man=new Man();

function findGirl() {
  console.log('找新的女朋友')
}
function saveMoney() {
  console.log('省钱')
}
man.on('失恋',findGirl)//失恋 ，绑定一个函数方法
man.on('失恋',saveMoney)//失恋 ，绑定一个函数方法
man.removeListener('失恋',findGirl); //移除省钱
man.emit('失恋');

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