jQuery仿新浪网“返回顶部”效果

<!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.lanrentuku.com/" target="_blank">懒人图库</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>

 

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