node_5/websocke/socket.io/solve foreign module download problem/mocha/chai (Assertion library)

Last Update:2017-12-30 Source: Internet

Author: User

Tags emit

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

WebSocket (to go to GitHub to install a WS) client has compatibility: WebSocket ("") only the higher version of the browser has

NPM Init
NPM Install--save ws

WebSocket

  * client.html<! DOCTYPE html>

* server.jsconst WebSocket = require(‘ws‘);const server = new WebSocket.Server({ port: 8080 });const clients = [];server.on(‘connection‘, (client) => { client.id = clients.length; clients.push(client) client.on(‘message‘, (message) => { //客户端监听 clients.forEach((clientItem) => { if (clientItem) { //clientItem && clientItem !== client可以屏蔽自己 clientItem.send(message); } }); }); client.on(‘close‘, () => { //容错 clients[client.id] = null }); client.on(‘error‘, () => { //容错 clients[client.id] = null });});

Socket.io (access to get started in Socket.io) 
  
   
   NPM init-y 
   NPM install--save [email protected] 
   NPM Install--save Socket.io 
   
 
Socket.io* Index.html<!doctype html>
* index.jsvar app = require(‘express‘)();var http = require(‘http‘).Server(app); //让用户能够访问一个网页var socketServer = require(‘socket.io‘)(http); //聊天app.get(‘/‘, function(req, res){ res.sendFile(__dirname + ‘/index.html‘); //sendFile是express提供的一个方法；可以把一个文件读取出来后返回给用户 //__dirname是node中的一个全局变量表示当前文件所在的绝对路径});socketServer.on(‘connection‘, function(socket){ //console.log(‘a user connection‘); //一旦有用户连接就输出a user connection socket.on(‘chat‘, function(msg){ //socket.broadcast.emit(‘brodcast‘, msg);//broadcast广播，一旦接收到一个用户的聊天就广播所有用户 socketServer.emit(‘brodcast‘, msg);//让自己接收自己发送的消息 });});http.listen(3000);
Solve foreign module Download problem: 
   
    
    FQ 
    Switch Source: NRM
NPM Install Nrm-g
NRM ls View usage source
NRM use CNPM switch source to CNPM 
    
  
Automated Test Framework Mocha (Mocha official website) Karma
Automated testing for large projects without frequent changes, small function iterations are relatively fast and are not recommended to use
 
   
    
    Yarn Init-y 
    NPM Install--global Mocha Global Installation Mocha 
    Create a new test folder to store the automated test code 
    The Const ASSERT = require ("Assert") in the JS code under the test folder 
    Input Mocha will automatically test all programs under the test folder 
    
  
Test async needs to write a done to the parameter, and then call
MOCHA-T 5000 Asynchronous time-out is 5 seconds
Automated testing facilitates QA but increases front-end public work chai (assertion library) Search Chai There are 3 kinds of syntax 
   
    
    NPM Install Chai--save 
    
  
Automated Test Framework Mocha* math.jsmodule.exports = {    add: function(a, b){        return Number(a, 10) + Number(b, 10);    },    minus: function(a, b){        return Number(a, 10) - Number(b, 10);    },    multiply: function(a, b){        return a * b;    },    devision: function(a, b){        return a / b;    }}
  * Math.test.js//const assert = require ("assert")//Assert Const CHAI = require ("Chai")//Assert library const MATH = r Equire ("..      /math.js ") chai.should (); Chai a syntax describe ("I'm going to test the Math module", () = {//describe is used to describe what it does ("Test Add Method", () = {//it description and true test code/*a  Ssert.equal (Math.add (1, 2), 3)//equal represent equality assert.equal (Math.add ( -1, 2), 1) assert.equal (Math.add ("1", 2), 3) */Math.add (1, 2). Should.equal (3)}), it ("Test minus Method", () = {//it description and true test code/*assert.equal (MA         Th.minus (1, 2),-1)//equal means equal assert.equal (Math.minus ( -1, 2), 3) assert.equal (Math.minus ("1", "2"),-1) Assert.equal (typeof Math.minus ("1", "2"), ' number ') */Math.minus (1, 2). Should.equal ( -1)}), it ("Test 2 seconds of , the multiplication is good ", (done) = {SetTimeout () {/*assert.equal (Math.multiply (5, 3), +) */M Ath.multiply (5, 2). Should.equal (Ten) Done ()})})  
 node_5/websocke/socket.io/solve foreign module download problem/mocha/chai (Assertion library)

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More