<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.5.1.min.js"></script>
<script>
$(document).ready(function(){ $(".btn1").click(function(){ $("p").slideUp(1000, function(){ alert("The slideUp() method is finished!"); });
});
$(".btn2").click(function(){ $("p").slideDown(1000, function(){ alert("The slideDown() method is finished!"); });
});
});
</script>
</head>
<body>
<p>这是一个段落。</p>
<button class="btn1">向上滑动</button>
<button class="btn2">向下滑动</button>
</body>
</html>