If mobile disable certain scripts

if (/Android|webOS|iPhone|iPad|iPod|BlackBerry/i.test(navigator.userAgent)) {
        // what you want to run in mobile
}

you can do something like this to test if it is a mobile.

if you are only concerned with the width :

if ($(window).width() <= 479) {
     do stuff
}

or you can use this package.

Use following

if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
 // some code..
}else
{
//Now include js files
}

for your second Question

use

if (window.width > 479) {
 $('head').append('<link rel="stylesheet" href="style2.css" type="text/css" />');
}

here you can include css or js file.

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