1.开始
源码下载：https://github.com/sayar/NodeMVA
在线视频：https://mva.microsoft.com/en-US/training-courses/using-node-js-with-visual-studio-code-13920
2.事件驱动编程语言Nodejs
阻塞与非阻塞(Blocking I/O and Non Blocking I/O)
Blocking I/O
| 1 2 3 4 | var fs = require( 'fs' ); var contents = fs.readFileSync( 'package.json' ).toString(); console.log(contents); |
Non Blocking I/O
| 1 2 3 4 5 | var fs = require( 'fs' ); fs.readFile( 'package.json' , function (err, buf) { console.log(buf.toString()); }); |
Nodejs与C#相反，readFileSync表示阻塞线程，而readFile不阻塞线程异步执行方法，调用完成后执行callback方法。
注：在c#中同步方法一般为object.action，同步方法会阻塞线程等待耗时操作执行完成，异步方法为object.actionAsyc，异步方法经常有个异步事件可以注册待异步方法执行结束后调用。
3.Hello World
打开源码文件夹01_HelloWorld，包含两个文件app.js和package.json
app.js
| 1 | console.log( 'Hello world' ); //在控制台中输出Hello World ， 令人熟悉的console类 |
package.json
| 1 2 3 4 5 6 7 8 9 10 | { "name" : "_01_HelloWorld" , "version" : "0.0.0" , "description" : "Hello World" , "main" : "app.js" , "author" : { "name" : "Rami Sayar" , "email" : "" } } |
打开CMD执行命令node app可以看到执行结果Hello World。
| 1 2 3 | $ cd 01_HelloWorld $ node app Hello World |
4.FileIO
打开源码文件夹03_FILEIO
app.js
| 1 2 3 4 5 6 7 8 9 10 | var fs = require( 'fs' ); //阻塞I/O toString 用起来很顺手，比学C#简单多了 var contents = fs.readFileSync( 'package.json' ).toString(); console.log(contents); //非阻塞I/O fs.readFile( 'package.json' , function (err, buf) { console.log(buf.toString()); }); |
5.Streams
打开源码文件夹06_Streams
app.js
| 1 2 3 4 5 6 | var fs = require( "fs" ); // Read File fs.createReadStream( "package.json" ) // Write File .pipe(fs.createWriteStream( "out-package.json" )); |
6.HelloWorldHttp
打开源码文件夹02_HelloWorldHttp
app.js
| 1 2 3 4 5 6 7 8 9 10 | var http = require( 'http' ); //处理http请求，返回200ok hello world var server = http.createServer( function (request, response) { response.writeHead(200, { "Content-Type" : "text/plain" }); response.end( "Hello World\n" ); }); //侦听7000端口 server.listen(7000); |
7.HelloWorldTCP
打开源码文件夹05_HelloWorldTCP
server.js
| 1 2 3 4 5 6 7 8 9 | var net = require( 'net' ); // The handler argument is automatically set as a listener for the 'connection' event var server = net.createServer( function (socket) { console.log( "Connection from " + socket.remoteAddress); socket.end( "Hello World\n" ); }); server.listen(7000, "127.0.0.1" ); |
client.js
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | var net = require( 'net' ); var client = new net.Socket(); client.connect(7000, "127.0.0.1" ); client.on( 'data' , function (data) { console.log( 'Data: ' + data); client.destroy(); }); // Add a 'close' event handler for the client socket client.on( 'close' , function () { console.log( 'Connection closed' ); }); |
打开两个CMD窗口，这两个窗口将会互相通讯。
| 1 2 | $ cd 05_HelloWorldTCP $ node server |
| 1 2 | $ cd 05_HelloWorldTCP $ node client |
8.Requests
打开源码文件夹10_Requests
app.js
| 1 2 3 4 5 | var request = require( "request" ); request( "http://www.bing.com" , function (error, response, body) { console.log(body); }); |
http://www.cnblogs.com/mengkzhaoyun/p/5355186.html