<style>
/* 回到顶部 */
#returnTop {
\_display:none;
position:fixed;
\_position:absolute;
z-index:999;
right:15px;
bottom:-200px;
\_bottom:auto;
text-indent:-999px;
width:36px;
height:65px;
overflow:hidden;
background-image:url(http://35230.wodemo.com/entry/232493/b93eccd4cfbc90d698d2e54ea72e79a7/Top.png);
\_background-image:url(http://35230.wodemo.com/entry/232493/b93eccd4cfbc90d698d2e54ea72e79a7/Top.png);
background-repeat:no-repeat;
background-position:0 0;
transition:bottom 0.9s;
-webkit-transition:bottom 0.9s;
-moz-transition:bottom 0.9s;
-o-transition:bottom 0.9s;
}
#returnTop:hover {
background-position:0 -65px;
}
</style>
<a id="returnTop" href="javascript:;">回到顶部</a>
<script src="http://35230.wodemo.com/entry/232493/77a34f3a918b1bb2f350c18497e66d36/jquery-1.6.4.min.js" type="text/javascript"></script>
<script type="text/javascript">
var IMYUAN;
IMYUAN || (IMYUAN = {});
(function(a) {
a.fn.extend({
returntop: function() {
if (this[0]) {
var b = this.click(function() {
a("html, body").animate({
scrollTop: 0
},
120)
}),
c = null;
a(window).bind("scroll",
function() {
var d = a(document).scrollTop(),
e = a(window).height();
0 < d ? b.css("bottom", "200px") : b.css("bottom", "-200px");
a.isIE6() && (b.hide(), clearTimeout(c), c = setTimeout(function() {
b.show();
clearTimeout(c)
},
1E3), b.css("top", d + e - 125))
})
}
}
})
})
(jQuery); (function(a) {
a("body")('<a class="close" href="javascript:;"></a>');
})
(function() {
$("#returnTop").returntop()
});
</script>
原文地址http://m.xiaows.com/entry/232493?cid=32347