jquery cdn
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
설치 jquery
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
qjuery
jQuery is a fast, small, and feature-rich JavaScript library.
It makes things like HTML document traversal and manipulation,
event handling, animation, and Ajax much simpler with an easy-to-use
API that works across a multitude of browsers.
With a combination of versatility and extensibility,
jQuery has changed the way that millions of people write JavaScript.