缓慢回到顶部

来源：互联网发布：电脑位数怎么看 mac 编辑：程序博客网时间：2024/05/18 00:33

<!DOCTYPE html>
<html>

<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#return {
display: block;
width: 40px;
height: 40px;
background-color: orange;
position: fixed;
left: 50%;
margin-left: 600px;
bottom: 20px;
}

#return:hover {
background-color: orangered;
}
</style>
<script type="text/javascript">
window.onload = function() {
var oRtn = document.getElementById('return');
var timer = null;
var flag = true;
oRtn.onclick = function() {
move();
}
window.onscroll = function() {
//flag为false时清除定时器，滚动条返回过程中，鼠标滚动使flag为false，返回中断停止
if(!flag) {
clearInterval(timer);
}
flag = false;
}

function move() {
clearInterval(timer);
timer = setInterval(function() {
var scoll = document.documentElement.scrollTop || document.body.scrollTop;
var speed = Math.floor(-scoll / 10);
flag = true;
document.documentElement.scrollTop = document.body.scrollTop = scoll + speed;
if(scoll == 0) {
clearInterval(timer);
}
}, 30)
}
};
</script>
</head>

<body style="height: 2000px;">
<a href="javascript:;" id="return" title="回到顶部"></a>
</body>

</html>

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