![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Correction status：qualified
Teacher's comments：
Collection
Collection
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>基础选择器</title>
<style type="text/css">
ul{
margin: 100px auto;
width: 420px;
border: 1px dashed #c9c9c9;
padding:10px 10px;
}
ul:after{
content: "";
display: block;
clear: both;
}
li{
list-style: none;
float: left;
width: 30px;
height: 30px;
border-radius: 50%;
background-color: #ea2000;
line-height: 30px;
text-align: center;
color: #fff;
margin-right:10px;
}
#item1{
background-color: blue;
}
.green{
background-color: #000;
}
ul li{
color: #38c5fa;
}
ul *{
border:1px solid #ff9800;
}
#item2 + li{
background-color: black;
}
#item3~li{
background-color: coral;
}
</style>
</head>
<body>
<ul>
<li id="item1">1</li>
<li class="green">2</li>
<li class="green">3</li>
<li class="">4</li>
<li>5</li>
<li id="item2">6</li>
<li id="item3">7</li>
<li>8</li>
<li>9</li>
<li>10</li>
</ul>
</body>
</html>点击 "运行实例" 按钮查看在线实例
