Node.js 외부 Javascript 파일 연동 관련

Node.js를 사용하여 웹과 서버프로그램 동시에 사용 가능한 코드 개발하기

http://blog.saltfactory.net/using-single-javascript-code-on-front-and-server-side/

/**
 * filename : person.js
 */
var Person = function (name) {  
    this.name = name;
    this.hello = function () {
        return "Hello, My name is " + this.name + "!";
    }
}

node 쉘에서 다음 코드를 실행한다.

var fs = require('fs');  
eval(fs.readFileSync('person.js', 'utf-8'));

var saltfactory = new Person("SungKwang");  
var mushroom = new Person("YoungJi");

console.log(saltfactory.hello()):  
console.log(mushroom.hello());  

* callback에서 this를 사용하는 것 때문에 불필요하게 시간 낭비를 했다. ㅠㅠ

https://stackoverflow.com/questions/20279484/how-to-access-the-correct-this-inside-a-callback

How to refer to the correct this

Don't use this

You actually don't want to access this in particular, but the object it refers to. That's why an easy solution is to simply create a new variable that also refers to that object. The variable can have any name, but common ones are self and that.

function MyConstructor(data, transport) {
    this.data = data;
    var self = this;
    transport.on('data', function() {
        alert(self.data);
    });
}

Since self is a normal variable, it obeys lexical scope rules and is accessible inside the callback. This also has the advantage that you can access the this value of the callback itself.