js---弹出框

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <!-- Bootstrap  CSS  -->
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <!-- jQuery -->
    <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
    <!-- Bootstrap JavaScript  -->
    <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
    
    <style>
        .parent {
            margin-top: 100px;
            margin-left: 100px;
            height: 20px;
            width: 100px;
            background-color: burlywood;
            text-align: center;
        }
        .son{
            min-height: 30px;
            width: 150px;
            background-color:burlywood;
            text-align: center;
            position: relative;
            top:-83px;
            left:100%;
        }
        .hid{
            display: none;
        }
    </style>

</head>

<body>
    <div class="img-rounded parent">
        2019-12-...
        <div class="img-rounded son">
            2019-12-12<br/>
            2019-12-12<br/>
            2019-12-12<br/>
        </div>
    </div>
</body>

</html>

<script>
    $('.son').addClass('hid');
    $('.parent').mouseover(function(){
        $('.son').removeClass('hid');
    });
    $('.parent').mouseleave(function(){
        $('.son').addClass('hid');
    });
</script>
Lonely || Soul
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