基础
node.js是用c++编写的一个javascript运行环境,特点:事件驱动、异步I/0。作为服务器端的javascript解释器,Node是一个轻量高效的开发平台,用户构建响应快速、高度可扩展的web应用,它使用事件驱动和非阻塞的I/O模型,非常适合开发数据密集、对实时响应要求高的分布式应用。
server.js //简单的http服务器
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‘);
执行:node server.js
模块
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);
更多参考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;
时间: 2024-10-05 20:04:49