HTML включает jQuery
<!-- Wrap inside the head tag -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
Av3
<!-- Wrap inside the head tag -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
// Put this script in the head of your index.html to load jQuery
// The Google Hosted Libraries is a stable, reliable, high-speed,
// globally available content distribution network for the most popular,
// open-source JavaScript libraries.
// Google works directly with the key stakeholders for each library effort
// and accepts the latest versions as they are released.<!--You can insert Jquery into HTML with the <script> tag in the <head>-->
<!--Insert the next line of code into your <head> tags.-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> <!-- jquery (help with javascript) --><script src="https://code.jquery.com/jquery-3.5.1.min.js"></script><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>