弹出菜单的实现原理

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .item{
            background-color: blanchedalmond;
        }
        /*鼠标放上去之后里面字体颜色变成红色的*/
        .item:hover{
            color: red;
        }
        /*放上去的时候改变了b里面的标签属性*/
        .item:hover .b{
            color: #3bae56;
        }
    </style>
</head>
<body>
        <div class="item">
            <div class="a">123</div>
            <div class="b">4456</div>
        </div>
</body>
</html>

  

posted @ 2018-04-06 00:59  梦中琴歌  阅读(142)  评论(0编辑  收藏  举报