<!DOCTYPE html>
<html lang="zh-Cn">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
body {
font-family: "Microsoft YaHei", serif;
}
body, dl, dd, p, h1, h2, h3, h4, h5, h6 {
margin: 0;
}
ol, ul, li {
margin: 0;
padding: 0;
list-style: none;
}
img {
border: none
}
</style>
</head>
<body>
<div id="wrap">
<p class="p1"></p>
<p class="p2"></p>
<p class="p3"></p>
</div>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<script>
$("#wrap p").addClass("qwq");
$("#wrap p").removeClass("p1");
$("#wrap p").toggleClass("ww");
</script>
</body>
</html>
Python3Turtle