javascript 简单的代码示例EventEmitter（）如何在节点js中工作

Posted 2021-05-03

// Basic events functionality

// const EventEmitter = require('events');
// const emitter = new EventEmitter();

// emitter.on('messageLogged', function(args){
//   console.log(`${args.name} : ${args.age}`)
//   console.log("Listener called");
// });


// emitter.on('customEvent', function(status, message){
//   console.log(`${message} : ${status}`);
// })

// emitter.emit('messageLogged', { name: "salman", age: "27" });
// emitter.emit('customEvent', 200, "Hellow new world!");

const EventEmitter = require('events').EventEmitter;
const util = require("util");

var Person = function(name){
  this.name = name;
}

util.inherits(Person, EventEmitter);

var p = new Person('Salman');

p.on('speak', function(said){
  console.log(`${this.name} is saying ${said}`);
});

p.emit('speak', "Hellow new world!");