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Correction status：qualified
Teacher's comments：
Collection
Collection
2、jQuery语句放到页面前方的话须使用$(document).ready()方法提前加载DOM部分
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>0402jquery的二种引入方式</title>
<!-- jquery的二种引入方式 -->
<!-- <script type="text/javascript" src="js/jquery.3.3.1.js"></script> -->
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(
function(){
$('ul>li:nth-child(2)~*').css('background-color','lightblue')
})
</script>
</head>
<style type="text/css">
.box{width:500px;margin:0 auto;border:1px solid #eee;}
ul{overflow: hidden;list-style: none;margin:0;padding: 0}
.box ul li{float:left;width:40px;height:40px;text-align: center;line-height: 40px;background: lightgreen;border-radius: 50%;margin:20px;}
</style>
<body>
<div class="box">
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ul>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
