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I have two javascript files included at the header of my website. Both files contains almost same variables.

If I have header like this 

  <head>
    <script src="http://127.0.0.1/js/file1.js" type="text/javascript"></script>
    <script src="http://127.0.0.1/js/file2.js" type="text/javascript"></script>
 </head>

Is it possible to access vars defined in file1.js from file2.js ?

This is what i`m trying

    file1
    $(function() {
        var x = 1;
    });

file2
    $(function() {
      console.log(x); //This dosen`t work. Can`t access var
    });
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5 Answers 5

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It's not possible the way you're doing it. Variables have to exist in the global scope to be available across files. In your example, x is defined in the scope of the anonymous function. If you changed it to 

// file1 
var x;
$(function() { 
    x = 1; 
});

then you could access x from your second file.

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Yep, that should work. As long as the variable is a global variable in one script it will appear in the other.

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Yes, you have a global object in the DOM that both files write variables to. Basically if file1 says:

foo = bar;

then in file2 you can access foo

If you explicitly want to declare a global variable, you can use the window object, which is the global object in a web page:

window.foo = 'bar';

More about global objects: http://www.quirksmode.org/js/this.html

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If you think of including javascript files as replacing the with the actual content of the script then of course. If the variable is global, file2 will have access to it.

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The only way you can do this is by giving each file its own "namespace".

var File1 = {
    X: 2
};


var File2 = {
    X: 3
};

Just in case this is isn't clear. What I mean is the contents of each file must be wrapped in a named object which will act as a namespace.

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