Why someone would use a hexadecimal approach in javascript?-CodePudding

I apologize cause this may be a bizarre question but I'm pretty confused. Would anyone know why someone would use what I believe to be "a hexadecimal approach" to javascript? i.e.) I see someone naming variables like

_0x2f8b, _0xcb6545,_0x893751, _0x1d2177, etc

Why would anyone ever do this? Also, I see code like

'to\x20bypass\x20this\x20link'

as well as hexadecimals for numbers such as 725392

0xb1190

So, how would anyone even get this kind of naming convention and why would they ever want to use this?

CodePudding user response：

Code like this has been, 99% of the time, automatically mangled/obfuscated from the original source code, in an attempt to make it more difficult to reverse engineer.

For example, if you start with

const foo = 'bar';
const somethingElse = 5;

you might use an obfuscation tool to come up with

var _0x2f8b, _0xcb6545;
_0x2f8b = 'bar';
_0xcb6545 = 5;

and serve that to clients. Reading 200 lines of obfuscated code is a lot harder than reading 200 lines of the original source code.

as well as hexadecimals for numbers such as 725392

Same thing - it's easier for a human to make sense of 725392 (which may be a magic number important for the application) than 0xb1190.

This isn't something that would be present in source code.