node简单实例

1.创建http服务

var http = require('http');
http.createServer(function(req,res){
	res.writeHead(200,{"Content-Type":"text/html"});
	res.write("<h1>Node.js</h1>");
	res.end("<p>Hello World</p>");
}).listen(3000);
console.log("HTTP server is listening at port 3000...");

 在cmd模式下执行如下代码：

D:\nodejsdemo>node app.js
HTTP server is listening at port 3000...

 在地址栏访问http://localhost:3000/，打印出上面内容

2.supervisor

supervisor模块可以检测源文件修改，不需要每次都执行node app.js才能看见源代码改动

安装：

D:\nodejsdemo>npm install -g supervisor

 使用运行app.js

D:\nodejsdemo>supervisor app.js

Running node-supervisor with
  program 'app.js'
  --watch '.'
  --extensions 'node,js'
  --exec 'node'

Starting child process with 'node app.js'
Watching directory 'D:\nodejsdemo' for changes.
HTTP server is listening at port 3000...

 3.事件使用

var EventEmitter = require("events").EventEmitter;
var event = new EventEmitter();
event.on("some_event",function(){
	console.log("some_event occured.");
});

setTimeout(function(){
	event.emit("some_event");
},3000)