node.js(一)

https://nodejs.org/en/

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>PCAT</p>‘);
}).listen(3000);
console.log(‘HTTP server is listening at port 3000.‘);

HTTP server is listening at port 3000.

npm install -g supervisor

supervisor app.js   文件名称

var fs=require(‘fs‘);
var data=fs.readFileSync(‘file.txt‘,‘UTF-8‘);
console.log(data);
console.log(‘end‘);

var fs=require(‘fs‘);
fs.readFile(‘file.txt‘,‘UTF-8‘,function(err,data){
    if(err){
        console.log(‘read file err‘);
    }else{
        console.log(data);
    }
});
console.log(‘end‘);

var EventEmitter=require(‘events‘).EventEmitter;
var event=new EventEmitter();
event.on(‘some_event‘,function(){
    console.log(‘这是一个自定义事件‘);
});
setTimeout(function(){
    event.emit(‘some_event‘);
},1000);

var myModule=require(‘./module‘);
myModule.setName(‘marico‘);
myModule.sayHello();

var name;
exports.setName=function(thyName){
	name=thyName;
}
exports.sayHello=function(){
	console.log(‘hello‘+name);
}

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

var hello=require(‘./module.js‘);
var he=new hello();
he.setName(‘marico‘);
he.sayHello();
var he2=new hello();
he2.setName(‘yfc‘);
he2.sayHello();