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How to use attribute selectors and pseudo-class selectors

php中世界最好的语言Original: 2017-11-24 10:00:432435browse

Today we will tell you about the usage and related connections and differences between Attribute Selector and PseudoClass Selector. Here is a small example.

Attribute selector:

[attr~="value"] Word Word Space Word Word must be valid

[attr|="value"] Value starts with or value - Word

Note:

It is difficult to use rules expressions to identify selected elements when selecting attributes, which is more efficient

Pseudo-class Selector:

: before

: after

:lang(val) val/val-word

:nth-child(n) nfrom Starting from 1, odd base and even even number

:nth-of-type(n) selector matches every element that is the Nth child element of a specific type of the parent element.

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<link href="css/index.css" rel="stylesheet" type="text/css" />
</head>
<body>
<!--
<p>aaaaaaa</p>
<p>aaaaaaa</p>
<p>aaaaaaa</p>
--->
<div>
       <p>aaa</p>
       <p>aaa</p>
       <p>aaa</p>
       <p>aaa</p>
</div>
</body>
</html>
Css部分：
@charset "utf-8";
/* CSS Document */
/*
p:before{
       content:"ccc"; 
}
 
p:lang(en){
       border:1px solid #ff0000;  
}
p:nth-child(even){
       background:#F00; 
}
*/
p:nth-of-type(3){  /* p标记的父元素 下的 第3个p元素*/
       background:#F00; 
}

How to use attribute selectors and pseudo-class selectors

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