Question

Is it possible to use a variable in a file called first.js inside another file called second.js?

first.js contains a variable called colorcodes.

Answer 1

As Fermin said, a variable in the global scope should be accessible to all scripts loaded after it is declared. You could also use a property of window or (in the global scope) this to get the same effect.

// first.js
var colorCodes = {
  back  : "#fff",
  front : "#888",
  side  : "#369"
};

… in another file …

// second.js
alert(colorCodes.back); // alerts `#fff`

… in your html file …

<script type="text/javascript" src="first.js"></script> 
<script type="text/javascript" src="second.js"></script>