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老师批语：作业已检查！
博客发布作业中添加了线上运行代码的新功能！
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>彩虹球</title>
<style type="text/css">
ul {
padding: 0;
margin: 0;
width: 450px;
border: 0px dashed #666;
padding: 10px 5px;
}
ul:after {
content:'';
display: block;
clear:both;
}
li {
list-style: none;
float: left;
width: 40px;
height: 40px;
line-height: 40px;
text-align: center;
border-radius: 50%;
background: skyblue;
margin-right: 5px;
}
#item1{
background-color: red
}
.green{
background-color: orangered
}
ul li{
color: white
}
li[class="red"] {
background-color: yellow
}
li[id="item2"] {
background-color: mediumseagreen
}
#item2 + li {
background-color: aqua
}
li[class ~= "black"] {
background-color: mediumblue;
}
li[class $= "e"] {
background-color: purple
}
</style>
</head>
<body>
<ul>
<li id="item1">1</li>
<li class="green">2</li>
<li class="red">3</li>
<li id="item2">4</li>
<li>5</li>
<li class="black">6</li>
<li class="blue">7</li>
</ul>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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