Restrict access to global context with javascript

Question

Say I have the following function

function foo(){
    console.log(test);
    console.log(window);
}

Is there a way to prevent foo to access the window object ? I've tried the following

foo.apply({});

But it only changes the this and leaves access to window

The function's scope is (nearly) always a descendant of the global scope, you hardly can restrict that (and it would make the script no longer work) — Bergi
– Bergi, Commented May 11, 2014 at 17:52

Niet the Dark Absol · Accepted Answer · 2014-05-12 15:51:52Z

1

You can use var window = {}; to override the reference to the global object. You can additionally use the .apply({}) method to prevent access via this.

However, nothing you can do will stop undeclared variables from being get/set on the global object, short of manually defining every possible variable name...

As Bergi points out, window = (function() {return this;}()); will restore the reference to the window object. This is again something that probably cannot be stopped.

edited May 12, 2014 at 15:51

answered May 11, 2014 at 17:44

Niet the Dark Absol

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3 Comments

Bergi Over a year ago

And how would you prevent anyone from restoring the reference, e.g. by window = (function(){return this;}()); (or eval magic if in strict mode)?

Niet the Dark Absol Over a year ago

@Bergi Huh, that's a good one. Didn't occur to me XD But since my answer is basically saying "you can make it difficult, but there are ways", the point is the same.

Beefster Over a year ago

(function(){return this;}()) will not work in strict mode.

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