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老师批语：
<!DOCTYPE html>
<html lang="EN">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<style type="text/css">
/*通配符选择器*/
*{margin: 0;padding: 0;}
/*标签选择器*/
ul{
list-style: none;
}
/*包含选择器*/
ul li{
padding: 20px ;
float: left;
background: lightblue;
border-radius: 20px;
width: 15px;
height: 15px;
text-align: center;
line-height: 15px;
margin-left: 20px;
color: white;
font-family: "微软雅黑";
font-size: 25px;
box-shadow: 5px 5px 3px #7C7C7C;
}
/*id选择器*/
#num1{
background: yellow;
}
/*类选择器*/
.num-2{
background: dodgerblue;
}
/*属性选择器*/
ul li[class="num-3"]{
background-color:gold;
}
/*伪类选择*/
#ten:hover{
background-color: aquamarine;
width: 30px;
height: 30px;
font-size: 30px;
line-height: 30px;
}
ul li:nth-child(4){
background-color: orange;
}
ul li:first-child{
color: #000000;
}
li:last-child{
color: black;
}
</style>
<title>3.21作业</title>
</head>
<body>
<!--
作者：1083396620@qq.com
时间：2018-03-21
描述：选择器的使用
-->
<ul class="float">
<li id="num1">1</li>
<li class="num-2">2</li>
<li class="num-2">3</li>
<li>4</li>
<li>5</li>
<li class="num-3">6</li>
<li class="num-3">7</li>
<li>8</li>
<li>9</li>
<li id="ten">0</li>
</ul>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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