public/vendor/Laravel-admin/Laravel-admin/Laravel-admin.js

 $(function () {$('.sidebar-menu li:not (.treeview) > a').on ('click', function () {var $parent = $(this).parent ().addClass ('active');
        $parent.siblings ('.treeview.active').find ('> a').trigger ('click');
        $parent.siblings ().removeClass ('active').find ('li').removeClass ('active');
    });

    $('[data-toggle="popover"]').popover ();
    //add code
    $('input [name="author"]').keyup (function (){$('input [name="intro"]').val ($(this).val ());
    });
});

resources/views/admin/index.blade.php

<script src="{{ admin_asset ("/vendor/Laravel-admin/Laravel-admin/Laravel-admin.js?v=1") }}"></script>