Create A File Of Constants In Javascript?

Is there a way to create a file of constants in JavaScript, which I can reference and then use?
What I am looking for is something like this:

Constants.js:
var Phones =
{
Nokia: 1,
Samsung: 2
}

Then, in another JavaScript file JS2.js access those values:

JS2.js:
alert(Phones.Nokia);

And then, in an aspx file that uses them, reference both of them, like:

<asp:ScriptReference Path="../js/JS2.js" />
<asp:ScriptReference Path="../js/Constants.js" />

Is such an architecture possible? What datatypes can we use? I only exemplified enums because this is what i use right now, but they must be declared in the same file as they are used.