我从youtube上学习，因为我的问题而结束了过渡。任何延迟或持续时间都不起作用，我不知道为什么。我很想知道执行这个问题的原因是什么。这方面我还是新手。:)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>::AFTER & :: BEFORE</title>
<link rel="stylesheet" href="style.css">
<script>
body {
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
font-size: 5rem;
}
p::before {
content: "";
background-color: red;
display: block;
width: 10px;
height: 10px;
transition: all ease-in-out 250ms;
}
p::after {
content: "";
background-color: red;
display: block;
width: 10px;
height: 10px;
transition-property: width;
transition-delay: 1s;
transition-duration: 2s;
}
p:hover::before,
p:hover::after {
width: auto;
}
</script>
</head>
<body>
<p>Here is some content</p>
</body>
</html>
首先，如果需要内联，则需要将css包含在style标记中。此外，当您使用width: auto时，它只会让浏览器计算宽度并为您设置。你最好将宽度设置为100%，它会尝试占用整个空间。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>::AFTER & :: BEFORE</title>
<link rel="stylesheet" href="style.css">
<style>
body {
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
font-size: 5rem;
}
p::before {
content: "";
background-color: red;
display: block;
width: 10px;
height: 10px;
transition: all ease-in-out 250ms;
}
p::after {
content: "";
background-color: red;
display: block;
width: 10px;
height: 10px;
transition-property: width;
transition-delay: 1s;
transition-duration: 2s;
}
p:hover::before,
p:hover::after {
width: 100%;
}
</style>
</head>
<body>
<p>Here is some content</p>
</body>
</html>