You can use any JS in your CRM.
WRONG. You can use only supported JavaScript, this means that if you use AngularJS (or another framework) to do unsupported customizations it's not supported.
My blog: www.crmanswers.net -
CRM Theme Generator
Ok, you can not do it.
But i can download this script and can use it, as i described above.
More of it, i can write my own JS and i can use it in a CRM.
But you can't do it :)