<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>中国的流浪猫</title>
<style>
div {
width: 500px;
height: 500px;
background-color: red;
}
div::after {
content: '';
display: inline-block;
width: 200px;
height: 100px;
background-color: yellow;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
<script>
var div = document.querySelector('div')
//第二个参数填伪元素，要字符串形式
console.log(getComputedStyle(div, 'after').backgroundColor);
console.log(getComputedStyle(div, 'after').width);
console.log(getComputedStyle(div, 'after').height);
</script>
js习题（获取伪元素属性的方法）
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转载自blog.csdn.net/weixin_46611729/article/details/108844694
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