Currently, the site created in HTML has been changed to the wordpress site.
In HTML, an error will occur if the javascript that runs is set to wordpress.

Error message

All the following errors are displayed.
Uncaught ReferenceError: jQuery is not defined

Applicable source code

<script src = "http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type = 'text/javascript' src = '●●●/js/jquery.inview.min.js'></script>
<script type = 'text/javascript' src = '●●●/js/function.js'></script>
<script type = 'text/javascript' src = '●●●/js/sp-menu.js'></script>
<script type = 'text/javascript' src = '●●●/js/scroll.js'></script>
<script type = 'text/javascript' src = '●●●/js/wideslider.js'></script>
<script type = 'text/javascript' src = '●●●/js/slick.min.js'></script>
<script type = 'text/javascript' src = '●●●/js/admin-bar.min.js? ver = 5.2.3'></script>
<script type = 'text/javascript' src = '●●●/js/wp-embed.min.js? ver = 5.2.3'></script>

-Change all javascript $s to jQuery
・ Window.addEventListener (Change to 'DOMContentLoaded', function () {

I tried to change the reading order and write it in header.php and function.php, but it still does not work with an error.

Thanks for your professorship.