js code not working on mobile devices. How to fix?

Question

JavaScript

Good afternoon! Help, please, advice. js code not working in mobile browsers.

var $showAll = $('#show-all'),
    $wrapper = $('.wrap'),
    $rollBack = $('#roll-back');

$showAll.on({
  click: function(){
    	$wrapper.addClass('shown');
        $showAll.hide();
    $rollBack.show();
    }
});

$rollBack.on({
  click: function(){
    	$wrapper.removeClass('shown');
        $showAll.show();
    $rollBack.hide();
    }
});

Clicking the Details button should open the description. Everything works fine on the PC.