<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>형제 요소 선택자</title>
<script src="js/jquery-1.12.4.min.js"></script>
<script>
$(function(){ //document.ready의 함축 형태
$('ul li').css('list-style','none');
$('li:nth-child(2)').siblings().css('background','pink');
});
</script>
</head>
<body>
<ul id="wrap">
<li>content1</li>
<li>content2</li>
<li>content3</li>
<li>content4</li>
</ul>
</body>
</html>