A brief introduction to Vue node. js

First, what is node. js?

It is a service platform that can run JavaScript, it can be used as a back-end program, but its development language is JavaScript

Second, installation

1. Node. JS Features:

- non-blocking IO model -time-driven

2, the use of the scene:

- high concurrency and low traffic - real-time scenarios -chat, ecommerce, live video, etc.

3. Installation Address:

http://nodejs.cn/
Determine if the installation was successful NODE-V
Enter edit state: node+ Enter, you can perform some operations
Exit edit mode: Ctrl+d or CTRL + C two times

4, NPM is a package manager, is actually a command. Use it to install or uninstall packages

Initialize the project first: NPM init (Fast initialize: NPM init-y), Generate files: Package.json

NPM Install package name--save---save---save: Bar Dependency Package added to the running environment

Three, simple use

Templating Development:

Stu.js

var man= "Haiyan"= man;  // Opening interface Console.log (man);

Stu2.js

var temps = require ("./stu.js");  // reference file, in the JS file add a./Representative is a sibling directory Console.log (temps);

So how do you execute the file? Node B.js ===== "Node filename

Iv. simple login with node. js

Login.html

<! DOCTYPE html>span{color:red; }    </style>functionLogin () {varUsername = $ ("#username"). Val (); varPassword = $ ("#password"). Val (); varurl = "Http://localhost:8080/login";        Console.log (Username,password); $.post (URL, {Username,password},function(response) {Console.log (response); if(response) {$ ("span"). HTML ("Login successful")            }Else{                $("span"). HTML ("Login failed")            }        })    }</script></body>
Server.js
varExpress = Require ("Express");//Reference Packagevarquery = require ("querystring");varApp = Express ();//InitializeApp.listen ("8080",function() {//MonitorConsole.log ("Service has started, port is 8080")});varData2= ""; App.post ('/login ',  function(request,response) {Response.header ("Access-control-allow-origin", "*"); Request.on ("Data",function(datas) {//To receive data from the user, it is not changed, it has to be called dataData2 = ""; //Console.log (datas);//<buffer 6e 6d 3d------                                //> The result of this printing is the buffer type, so we have to stitch it up and use QueryString to convert the module into a string .data2+=datas;      }); Request.on ("End",function() {//start parsing after receiving data from the userConsole.log (Query.parse (data2));//{username: ' Haiyan ', Password: ' 123 '}          varUsername =Query.parse (data2). Username; varPassword =Query.parse (data2). password; if(username = "Haiyan" && password = = "123") {response.send (true)//return data to the front End if login is successful}Else{response.send (false)          }      })  });
Note: When started ===>node server.js
A brief introduction to Vue node. js