详细介绍视频地址：【HTML/CSS/JS】CSS函数attr()，真是令人……
效果图
演示代码
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CSS attr()</title>
<style>
html,
body {
margin: 0;
padding: 0;
width: 100vw;
height: 100vh;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
font-size: 24px;
font-weight: bold;
}
div {
position: relative;
width: 100px;
height: 100px;
border-radius: 20px;
background: url('../../assets/images/bilibili.jpeg');
background-size: 100%
}
div::after {
content: attr(data-count);
position: absolute;
top: -15px;
right: -15px;
display: flex;
justify-content: center;
align-items: center;
width: 40px;
height: 40px;
border-radius: 50%;
background-color: red;
color: white;
}
div[data-count='0']::after {
display: none;
}
div[data-count='4'] {
background: url('../../assets/images/like.gif');
background-size: 100%
}
div[data-count='4']::after {
content: '...';
}
[data-text] {
color: blue;
}
[data-text]::before {
content: attr(data-text) ' ';
color: red;
}
</style>
</head>
<body>
<div data-count='0' onclick='updateCount(this)'></div>
<p data-text='hello'>world</p>
<script>
const updateCount = (e) => {
let newCount = e.dataset.count * 1 + 1
e.dataset.count = newCount
};
</script>
</body>
</html>
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