固定标签(position: fixed)

document.body.scrollTop 要改成 document.documentElement.scrollTop不然不生效

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

    <div onclick="GoTop();" style="width: 50px;height: 50px;background-color: black;color: white;

    position: fixed;

    bottom:20px;

    right: 20px;

    ">返回顶部</div>

    <div style="height: 5000px;background-color: #dddddd;">

        正文

    </div>

    <script>

        function GoTop(){

            document.body.scrollTop = 0;

        }

    </script>

</body>

</html>

巴特西

固定标签(position: fixed)

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