介于网上没有简单的JQuery的国际象棋棋盘在此写了一个，供大家参考
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
* {
padding: 0;
margin: 0;
}
ul,
li {
list-style: none
}
li {
width: 100px;
height: 100px;
float: left;
border: 1px solid black;
box-sizing: border-box;
}
#container {
width: 300px;
height: 300px;
margin: 100px auto;
border: 2px solid black;
}
</style>
<script src="../../../../jquery-3.6.0.min.js"></script>
</head>
<body>
<div id="container">
<ul>
<li></li>
<li></li>
<li></li>
</ul>
<ul>
<li></li>
<li></li>
<li></li>
</ul>
<ul>
<li></li>
<li></li>
<li></li>
</ul>
</div>
<script>
$("#container>ul").children("li:even").css("background", "black");
</script>
</body>
</html>
效果如图