jQuery实现返回顶部效果的方法
本文实例讲述了jQuery实现返回顶部效果的方法。分享给大家供大家参考。具体实现方法如下：
1、首先是CSS样式：
/*updown*/
#shangxia{position:fixed;top:83%;right:42%;margin-right:-543px;display:block;_display:none}
#shang,#comt,#xia{background:url(../images/sprite.png)no-repeat;position:relative;cursor:pointer;height:25px;width:29px;margin:10px00}
#shang{background-position:0-308px}#comt{background-position:0-338px;height:32px}
#xia{background-position:0-376px}
#comt:hover{background-position:-31px-338px}#shang:hover{background-position:-31px-308px}
#xia:hover{background-position:-31px-376px}
2、接着是jquery代码：（要引入jQuery核心库）
/*updown*/
jQuery(document).ready(function($){$body=(window.opera)?(document.compatMode=="CSS1Compat"?$("html"):$("body")):$("html,body");$("#shang").mouseover(function(){up()}).mouseout(function(){clearTimeout(fq)}).click(function(){$body.animate({scrollTop:0},400)});$("#xia").mouseover(function(){dn()}).mouseout(function(){clearTimeout(fq)}).click(function(){$body.animate({scrollTop:$(document).height()},400)});$("#comt").click(function(){$body.animate({scrollTop:$("#comments").offset().top},400)});});functionup(){$wd=jQuery(window);$wd.scrollTop($wd.scrollTop()-1);fq=setTimeout("up()",50)};functiondn(){$wd=jQuery(window);$wd.scrollTop($wd.scrollTop()+1);fq=setTimeout("dn()",50)};
3、引用页面：
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">
<title>MyJSP'index.jsp'startingpage</title>
<metahttp-equiv="pragma"content="no-cache">
<metahttp-equiv="cache-control"content="no-cache">
<metahttp-equiv="expires"content="0">
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="Thisismypage">
<!--
<linkrel="stylesheet"type="text/css"href="styles.css">
-->
<styletype="text/css">
/*updown*/
#shangxia{position:fixed;top:60%;right:50%;margin-right:-543px;display:block;_display:none}
#shang,#comt,#xia{background:url(images/sprite.png)no-repeat;position:relative;cursor:pointer;height:25px;width:29px;margin:10px00}
#shang{background-position:0-308px}#comt{background-position:0-338px;height:32px}#xia{background-position:0-376px}
#comt:hover{background-position:-31px-338px}#shang:hover{background-position:-31px-308px}#xia:hover{background-position:-31px-376px}
/*存档*/
</style>
///上面的是内部样式，上面已经有外部样式，如果不使用内部样式可以引入外部样式
<scripttype="text/javascript"src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<scripttype="text/javascript"src="http://code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
<scripttype="text/javascript"src="js/updown/devework.js"></script>
</head>
<body>
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<divid="shangxia">
<divid="shang"title="↑返回顶部"></div>
<divid="comt"title="沙发还没有被抢哦"></div>
<divid="xia"title="↓移至底部"></div>
</div>
</body>
</html>
希望本文所述对大家的jQuery程序设计有所帮助。