JS 容易的点击返回顶部的功能

JS 简单的点击返回顶部的功能

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>JS 回到顶部</title>
<link rel="stylesheet" href="base.css" />
<style>
#toTop {
	width: 30px;
	height: 40px;
	padding: 20px;
	text-align: center;
	background: #06c;
	position: absolute;
	cursor: pointer;
	color: #fff;
}
</style>
<script>
window.onload = function() {
	var oTop = document.getElementById("toTop");
	var screenw = document.documentElement.clientWidth || document.body.clientWidth;
	var screenh = document.documentElement.clientHeight || document.body.clientHeight;
	oTop.style.left = screenw - oTop.offsetWidth + "px";
	oTop.style.top = screenh - oTop.offsetHeight + "px";
	window.onscroll = function() {
		var scrolltop = document.documentElement.scrollTop || document.body.scrollTop;
		oTop.style.top = screenh - oTop.offsetHeight + scrolltop + "px";
	}
	oTop.onclick = function() {
		document.documentElement.scrollTop = document.body.scrollTop = 0;
	}
}
</script>
</head>
<body style="height:3000px;">
<h3 style=" text-align: center; padding-top: 40px;">阅谁问君诵，水落清香浮</h3>
<div id="toTop">返回顶部</div>
</body>
</html>

PSp：兼容IE6+，火狐，谷歌，欧朋的内核浏览器

效果图：
JS 容易的点击返回顶部的功能

1 楼 noah100 昨天

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JS 容易的点击返回顶部的功能

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