html鼠标悬停如何弹出下拉块？ html里鼠标放到标题上会有下拉的效果如何实现
可以用js来实现也可以用纯css来实现。按照你的需求，用纯css即可，给你一个简单的demo：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.wechat{ float: left;}
.wechat .wechat_code{display: none; height: 100px; width: 100px; background: red;}
.wechat:hover .wechat_code{display: block;}
</style>
</head>
<body>
<div class="wechat">
<h2 class="wechat_account">我是微信号</h2>
<div class="wechat_code">我是二维码</div>
</div>
</body>
</html>
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