jQuery仿新浪网“返回顶部”效果

it2000 · 发表于 2013-10-22 20:41:22

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>仿新浪网“返回顶部”效果</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<style type="text/css">
.backToTop {
display: none;
width: 18px;
line-height: 1.2;
padding: 5px 0;
background-color: #000;
color: #fff;
font-size: 12px;
text-align: center;
position: fixed;
_position: absolute;
right: 10px;
bottom: 100px;
_bottom: "auto";
cursor: pointer;
opacity: .6;
filter: Alpha(opacity=60);
}
</style>
<script type="text/javascript" src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js"></script>
</head>
<body>
<p>如果预览时左下角提示错误，<font color=red>请先刷新一下本页面</font>就可以看到效果了。</p>
<p> 拖动滚动条到页面底部就会显示“返回顶部”按钮。</p>
<p> 更多代码请访问：<a href="http://www.dz12.com/" target="_blank">dz模板站</a></p>
<p></p>
<div style="height:2000px;"></div>
<script type="text/javascript">
(function() {
var $backToTopTxt = "返回顶部", $backToTopEle = $('<div class="backToTop"></div>').appendTo($("body"))
.text($backToTopTxt).attr("title", $backToTopTxt).click(function() {
$("html, body").animate({ scrollTop: 0 }, 120);
}), $backToTopFun = function() {
var st = $(document).scrollTop(), winh = $(window).height();
(st > 0)? $backToTopEle.show(): $backToTopEle.hide();
//IE6下的定位
if (!window.XMLHttpRequest) {
$backToTopEle.css("top", st + winh - 166);
}
};
$(window).bind("scroll", $backToTopFun);
$(function() { $backToTopFun(); });
})();
</script>
</body>
</html>