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jQuery实现返回顶部效果的方法

作者:佚名    责任编辑:admin    更新时间:2022-06-22

   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:

  ?

1 2 3 4 5 6 7 /*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:10px 0 0} #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)

  复制代码 代码如下:

  /*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: $("#comments").offset().top},400)});});function up() {$wd = jQuery(window);$wd.scrollTop($wd.scrollTop() - 1);fq = setTimeout("up()", 50)};function dn() {$wd = jQuery(window);$wd.scrollTop($wd.scrollTop() + 1);fq = setTimeout("dn()", 50)};

  3、引用页面:

  ?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <style type="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:10px 0 0} #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 <script type="text/javascript" src="http://code.jquery.com/jquery-1.10.1.min.js"></script> <script type="text/javascript" src="http://code.jquery.com/jquery-migrate-1.2.1.min.js"></script> <script type="text/javascript" src="js/updown/devework.js"></script> </head> <body> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>1</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <p>333</p> <