Interesting Javascript

[Dragon20942]

Any idea why this doesn't work anymore? http://compsci.ca/v3/viewtopic.php?t=27363

Tony @ Sat Jan 22, 2011 1:05 pm wrote:

Dragon20942 @ Fri Jan 21, 2011 8:43 pm wrote:

variable concatenation

You guys might get a kick out of this

code:

($=[$=[]][(__=!$+$)[_=-~-~-~$]+({}+$)[_/_]+($$=($_=!''+$)[_/_]+$_[+$])])()[__[_/_]+__[_+~$]+$_[_]+$$](_/_)

(add "javascript:" at the start and paste into the address bar to run)

with explanation at http://adamcecc.blogspot.com/2011/01/javascript.html

[Zren]

Probably an increase in browser security against bookmarklets (javascript executed in the url bar).

Open up the browser's console and try running it there (Ctrl+Shift+J on chrome).

[Tony]

Zren is likely right, JavaScript security is a big issue. At some point Facebook attempted to even disable browser's console ( http://stackoverflow.com/questions/21692646/how-does-facebook-disable-the-browsers-integrated-developer-tools ) because too many people were falling for a scam that involved them running arbitrary javascript on their logged in account (this effectively gives your account away).

That particular piece of Javascript (from 4+ years ago) no longer works (at least not in Chrome), but if you poke around the explanation link, you can probably fix it.

Quote:

$=[$=[]]
-> [Array[0]]
(__ = !$ + $)
-> "falsefunction $(selector, [startNode]) { [Command Line API] }"

This now behaves differently, but you also get a lot more different characters from a string then just "false".

Previously they were coding only with letters from "false", "true", and "object".

[melissarubbe]

Zren @ Sun Mar 29, 2015 8:02 pm wrote:

Probably an increase in browser security against bookmarklets (javascript executed in the url bar).

Open up the browser's console and try running it there (Ctrl+Shift+J on chrome).

Does this code can be apply for firefox as well?

[Zren]

Opening developer tools is usually F12 on any browser. The console should be somewhere in there. If not, it'll be somewhere in the menu.