html
<p><a href="#top"><span></span></a></p>
css
p#back-to-top{ position:fixed; bottom:100px; right:80px; } p#back-to-top a{ text-align:center; text-decoration:none; color:#d1d1d1; display:block; width:30px; /*使用CSS3中的transition属性给跳转链接中的文字添加渐变效果*/ -moz-transition:color1s; -webkit-transition:color1s; -o-transition:color1s; } p#back-to-top a:hover{ color:#979797; } p#back-to-top a span{ background:#d1d1d1 url(../images/arrow_up.png) no-repeat center center; border-radius:6px; display:block; height:30px; width:30px; margin-bottom:5px; /*使用CSS3中的transition属性给<span>标签背景颜色添加渐变效果*/ -moz-transition:background1s; -webkit-transition:background1s; -o-transition:background1s; } #back-to-top a:hover span{ background:#979797 url(../images/arrow_up.png) no-repeat center center; }
js
<script type="text/javascript"> $(document).ready(function(){ //首先将#back-to-top隐藏 $("#back-to-top").hide(); //当滚动条的位置处于距顶部600像素以下时，跳转链接出现，否则消失 $(function () { $(window).scroll(function(){ if ($(window).scrollTop()>600){ $("#back-to-top").fadeIn(500); }else{ $("#back-to-top").fadeOut(500); } }); //当点击跳转链接后，回到页面顶部位置 $("#back-to-top").click(function(){ $('body,html').animate({scrollTop:0},500); return false; }); }); }); </script>