动画效果返回顶部js与css代码

2015-04-10 网页编程网 网页编程网

<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>弹性返回顶部JS代码</title> 
<script type="text/javascript"> 
function goTopEx() { 
var obj = document.getElementById("goTopBtn"); 
function getScrollTop() { 
return document.documentElement.scrollTop + document.body.scrollTop; 
} 
function setScrollTop(value) { 
if(document.documentElement.scrollTop) { 
document.documentElement.scrollTop = value; 
} else { 
document.body.scrollTop = value; 
} 
} 
window.onscroll = function() { 
getScrollTop() > 0 ? obj.style.display = "": obj.style.display = "none"; 
} 
obj.onclick = function() { 
var goTop = setInterval(scrollMove, 10); 
function scrollMove() { 
setScrollTop(getScrollTop() / 1.1); 
if (getScrollTop() < 1) clearInterval(goTop); 
} 
} 
} 
</script> 
<style> 
BODY { 
HEIGHT: 3600px; 
} 
#goTopBtn { 
POSITION: fixed; TEXT-ALIGN: center; LINE-HEIGHT: 30px; WIDTH: 30px; BOTTOM: 35px; HEIGHT: 33px; FONT-SIZE: 12px; CURSOR: pointer; RIGHT: 0px; _position: absolute; _right: auto 
} 
</style> 
</head> 
<body style="text-align:center"> 
<div style="display: none" id="goTopBtn"><img border=0 src="/${res}/img/go_to_top.png"></div> 
<script type=text/javascript>goTopEx();</script> 
<br /><br /><br /><br /><br /><br /><br /> 
超出首屏范围，即会出现TOP按钮，否则自动隐藏。<br />
</body> 
</html>

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