ネットや書籍を使わずにjavascriptを学ぶ ref: http://qiita.com/mikamikuh@github/items/091de83ffbd1fde1cc06

file0.txt

var Person = function(name, age) {
    this.name = name;
    this.age = age;
};

var one = new Person("Mikami", 27);
var two = new Person("Hoge", 50);

console.log(one.name);
console.log(one.age);
console.log(two.name);
console.log(two.age);

file1.txt

Mikami
27
Hoge
50

file2.txt

(function(global) {
    var Fuga = {};
    ...
    global['Fuga'] = Fuga
})(this);

file3.txt

var Fuga = {};
...
this['Fuga'] = Fuga

file4.txt

var Person = function(name, age) {
    this.name = name;
    this.age = age;
};

...

var Adult = {};
var Person = {};

...

this['Adult'] = Adult;