jquery滑进滑出效果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="jquery-2.1.4.min.js"></script>
</head>
<body>
    <div><input id="xianshi" type="button" value="显示"></div>
    <div><input id="yincan" type="button" value="隐藏"></div>
    <div><input id="togg" type="button" value="toggle"></div>
    <div id="dda" style="display:none;background-color: #336699;height: 100px"></div>
</body>
<script>
        $("#xianshi").click(function () {
            $("#dda").slideDown(1000);
        });

                $("#yincan").click(function () {
            $("#dda").slideUp(1000);
        });

                        $("#togg").click(function () {
            $("#dda").slideToggle(1000);
        });
</script>
</html>