<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div onclick="GoTop();" style="position: fixed; background-color: #022531; color: #eff9f9; bottom: 20px; right: 20px; height: 50px; width: 50px;">返回顶部</div>
<div style="height: 5000px; background-color: #dddddd; color: #f25022"> </div>
<script>
function GoTop(){
document.body.scrollTop = 0;
}
</script>
</body>
</html>