轻松学 Node.js - 基础篇 #5 事件

下载源码求知小风 · 真仙发布于2018-01-20

https://nodejs.org/dist/latest-v9.x/docs/api/events.html

https://nodejs.org/dist/latest-v9.x/docs/api/util.html#util_util_inherits_constructor_superconstructor

var events = require('events');
var util = require('util');

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

util.inherits(Person, events.EventEmitter);

var xiaoming = new Person('xiaoming');
var lili = new Person('lili');
var lucy = new Person('lucy');

var person = [xiaoming, lili, lucy];

person.forEach(function(person) {
    person.on('speak', function(message) {
        console.log(person.name + " said: " + message);
    })
})

xiaoming.emit('speak', 'hi');
lucy.emit('speak', 'I want a curry');

// var myEmitter = new events.EventEmitter();

// myEmitter.on('someEvent', function(message) {
//     console.log(message);
// })

// myEmitter.emit('someEvent', 'the event was emitted');

8 条回复

pyyzcwg2833 · 元婴 #1 2018-03-15

最好用ES6哈哈哈
求知小风 · 真仙 #2 2018-03-16

实践课会用 es6
ByeWord · 合体 #3 2018-05-14

let events = require('events');
let utils = require('util');

// let myEmitter = new events.EventEmitter();

// myEmitter.on('connected',(message)=>{
// console.log(message);
// })
//按监听器的注册顺序，同步地调用每个注册到名为 eventName 事件的监听器，并传入提供的参数。
// myEmitter.emit('connected','你好世界')

class Person extends events.EventEmitter {
constructor(name){
super();
this.name = name;
}
}
let lily = new Person('Lily');
let lucy = new Person('Lucy');

let peoples = [lily, lucy];
peoples.forEach(people => {
people.on('say',(message)=>{
console.log(message,this);
})
});
lily.emit('say','你好啊,世界');
lucy.emit('say','欢迎,大千世界')
dechuangchang · 合体 #4 2018-05-31

const EventEmitter = require('events');
class MyEmitter extends EventEmitter {}

const fun1= new MyEmitter();
const fun2= new MyEmitter();
const fun3= new MyEmitter();

let arr = [fun1,fun2,fun3];
arr.forEach((item)=>{
item.on('event', msg => {
console.log(msg);
});
})
fun1.emit('event','fun1');
fun2.emit('event','fun2');
fun3.emit('event','fun3');
DoubleF · 元婴 #5 2018-08-08

这章我基本上看得一头雾水~
ll199312 · 元婴 #6 2018-08-17

讲的很棒
carrieguo · 元婴 #7 2018-09-07

const EventEmitter = require('events');

class Person extends EventEmitter {
constructor(name) {
super();
this.name = name;
}
}

let xiaoming = new Person('xiaoming');
let lili = new Person('lili');
let lucy = new Person('lucy');

let person = [xiaoming, lili, lucy];

person.forEach(function(person) {
person.on('speak', function(message) {
console.log(person.name + "say" + message);
})
});

xiaoming.emit('speak', 'hi');
Lyle101 · 元婴 #8 2018-10-25

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');