Checkbox来储存状态
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style type="text/css">
.txt{padding: 20px;}
#myCheck{display: none;}
.menu{cursor: pointer;}
.tt{display: none;width: 300px;min-height: 100px;background-color: #ccc;padding: 20px;}
#myCheck:checked ~ .tt{display: block;}
</style>
</head>
<body>
<label for="myCheck" class="menu">菜单</label>
<input id="myCheck" type="checkbox" name="">
<div class="txt">
<p>利用Checkbox来储存状态 </p>
<p>#myCheck:checked ~ .tt // ~ 记得要加</p>
</div>
<div class='tt'>内容</div>
</body>
</html>
