nodejs入門學習

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基礎

node.js是用c++編寫的一個javascript運行環境，特點：事件驅動、非同步I/0。作為伺服器端的javascript解譯器，Node是一個輕量高效的開發平台，使用者構建響應快速、高度可擴充的web應用，它使用事件驅動和非阻塞的I/O模型，非常適合開發資料密集、對即時響應要求高的分布式應用。

server.js //簡單的http伺服器

var http = require(‘http‘);http.createServer(function(req, res) {    res.writeHead(200, {‘Content-Type‘: ‘text/plain‘});    res.end(‘hello world\n‘);}).listen(8888);console.log(‘server running at http://127.0.0.1‘);

執行：node server.js

模組

main.js

var hello = require(‘./hello‘);hello.world();

hello.js

exports.world = function() {    console.log(‘hello world‘);}

main1.js

var Hello = require(‘./hello1‘);hello = new Hello();hello.setName(‘aaa‘);hello.sayHello();

hello1.js

function Hello() {    var name;    this.setName = function(myname) {        name = myname;    }    this.sayHello = function() {        console.log(‘hello ‘ + name);    }}module.exports = Hello;

事件

event.js

var EventEmitter = require(‘events‘).EventEmitter;var event = new EventEmitter();event.on(‘event1‘, function() {    console.log(‘event1 occured.‘);});setTimeout(function() {    event.emit(‘event1‘);}, 1000);

event1.js

var events = require(‘events‘);var emitter = new events.EventEmitter();emitter.on(‘event1‘, function(arg1, arg2) {    console.log(‘listener1‘, arg1, arg2);});emitter.on(‘event1‘, function(arg1, arg2) {    console.log(‘listener2‘, arg1, arg2);});emitter.emit(‘event1‘, ‘aaa‘, 123);

更多參考http://www.w3cschool.cc/nodejs/nodejs-event.html

路由

index.js

var server = require(‘./server‘);var router = require(‘./router‘);server.start(router.route);

server.js

var http = require(‘http‘);var url = require(‘url‘);function start(route) {    function onRequest(req, res) {        var pathname = url.parse(req.url).pathname;        console.log(‘request for ‘ + pathname + ‘ received.‘);        route(pathname);        res.writeHead(200, {‘Conten-Type‘: ‘text/plain‘});        res.write(‘hello, world‘);        res.end();    }    http.createServer(onRequest).listen(8888);    console.log(‘server has started.‘);}exports.start = start;

router.js

function route(pathname) {    console.log(‘about to route a request for ‘ + pathname);}exports.route = route;

 

nodejs入門學習