Using this to set a value in javascript

HI,
In my js file i have the following code :
var data;
exports.setData = function(data) {
    this.data = data;
}

Now whenever i have to use the value of data have to type this.data

so when i am using this where is data created.. ?
And how do i set the value inside the variable data rather than using this ??

Thanks
Rohit BajajAsked:
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Julian HansenConnect With a Mentor Commented:
How this behaves depends on whether you are in strict mode or not.

This article describes how this is interpreted.

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Operators/this
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