当我将鼠标悬停在其他地方时，如何设置显示某物的延迟？ 如果有人能帮助我，我将不胜感激。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="sthelse"> sthelse </div>
<div class="sth">sth</div>
</body>
</html>
.sth{
display: none;
}
.sthelse:hover + .sth{
display: block;
transition: 2s;
}
要添加使某些内容出现的过渡，您需要向不透明度属性添加过渡。将不透明度设置为 0，然后在悬停时将其设置为 1，过渡时间为 2 秒：
.sth {
opacity: 0;
transition: 2s;
}
.sthelse:hover + .sth {
opacity: 1;
transition: 2s;
}<!DOCTYPE html>
<html lang="en">
<body>
<div class="sthelse"> sthelse </div>
<div class="sth">sth</div>
</body>
</html>