<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>属性选择器（重要）</title>
<style>
.demo a{
float: left;
display: block;
height: 50px;
width: 50px;
border-radius: 10px;
background: #699ce7;
text-align: center;
color: gray;
text-decoration: none;
margin-right: 5px;
font: bold 20px/50px Arial;
}
/* 存在id属性的元素 */
a[id]{
background: yellow;
}
/* 存在id属性的且id名称是idName2 */
a[id=idName2]{
background: yellow;
}
/* class中包含有links的元素
= 绝对等于
*= 包含等于
^= 以什么开头
$= 以设么结尾
*/
a[class *= "links"]{
background: red;
}
/* 选中href中已http开头的元素 */
a[href^=http]{
background: gray;
}
</style>
</head>
<body>
<p class="demo">
<a href="https://www.baidu.com" class="links item first" id="idName1">1</a>
<a href="" class="links item active" target="_blank" title="test" id="idName2">2</a>
<a href="images/123.html" class="links item">3</a>
<a href="images/123.png" class="links item">4</a>
<a href="images/123.jpg" class="links item">5</a>
<a href="abc" class="links item">6</a>
<a href="/a.pdf" class="links item">7</a>
<a href="/abc.pdf" class="links item">8</a>
<a href="abc.doc" class="links item">9</a>
<a href="abcd.doc" class="links item last">10</a>
</p>
</body>
</html>