Can I access variables from another file?

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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>

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