将discuz返回顶部代码拿出来
- 格式：doc
- 大小：22.00 KB
- 文档页数：3
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> </title>
<meta name="Keywords" content="" />
<meta name="Description" content="" />
</head>
<style type="text/css">
*{margin:0 auto;}
#ft{width:800px; height:1000px; border:1px solid #cdcdcd;}
#scrolltop {visibility: hidden; position: fixed; bottom: 100px; display: block; margin: -30px 0 0 2px; width: 30px; cursor: pointer; }
</style>
<script type="text/javascript">
<!--
var BROWSER = {};
function _attachEvent(obj, evt, func, eventobj) {
eventobj = !eventobj ? obj : eventobj;
if(obj.addEventListener) {
obj.addEventListener(evt, func, false);
} else if(eventobj.attachEvent) {
obj.attachEvent('on' + evt, func);
}
}
function getCurrentStyle(obj, cssproperty, csspropertyNS) {
if(obj.style[cssproperty]){
return obj.style[cssproperty];
}
if (obj.currentStyle) {
return obj.currentStyle[cssproperty];
} else if (document.defaultView.getComputedStyle(obj, null)) {
var currentStyle = document.defaultView.getComputedStyle(obj, null);
var value = currentStyle.getPropertyValue(csspropertyNS);
if(!value){
value = currentStyle[cssproperty];
}
return value;
} else if (window.getComputedStyle) {
var currentStyle = window.getComputedStyle(obj, "");
return currentStyle.getPropertyValue(csspropertyNS);
}
}
function fetchOffset(obj, mode) {
var left_offset = 0, top_offset = 0, mode = !mode ? 0 : mode;
if(obj.getBoundingClientRect && !mode) {
var rect = obj.getBoundingClientRect();
var scrollTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
var scrollLeft = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft);
if(document.documentElement.dir == 'rtl') {
scrollLeft = scrollLeft + document.documentElement.clientWidth - document.documentElement.scrollWidth;
}
left_offset = rect.left + scrollLeft - document.documentElement.clientLeft;
top_offset = rect.top + scrollTop - document.documentElement.clientTop;
}
if(left_offset <= 0 || top_offset <= 0) {
left_offset = obj.offsetLeft;
top_offset = obj.offsetTop;
while((obj = obj.offsetParent) != null) {
position = getCurrentStyle(obj, 'position', 'position');
if(position == 'relative') {
continue;
}
left_offset += obj.offsetLeft;
top_offset += obj.offsetTop;
}
}
return {'left' : left_offset, 'top' : top_offset};
}
function showTopLink() {
var ft = document.getElementById('ft');
if(ft){
var scrolltop = document.getElementById('scrolltop');
var viewPortHeight = parseInt(document.documentElement.clientHeight);
var scrollHeight = parseInt(document.body.getBoundingClientRect().top);
var basew = parseInt(ft.clientWidth);
var sw = scrolltop.clientWidth;
if (basew < 1000) {
var left = parseInt(fetchOffset(ft)['left']);
left = left < sw ? left * 2 - sw : left;
scrolltop.style.left = ( basew + left ) + 'px';
} else {
scrolltop.style.left = 'auto';
scrolltop.style.right = 0;
}
if (BROWSER.ie && BROWSER.ie < 7) {
scrolltop.style.top = viewPortHeight - scrollHeight - 150 + 'px';
}
if (scrollHeight < -100) {
scrolltop.style.visibility = 'visible';
} else {
scrolltop.style.visibility = 'hidden';
}
}
}
//-->
</script>
<body>
<div id="ft" class="wp cl"></div>
<span id="scrolltop"><a href="javascript:;" onclick="window.scrollTo('0','0')">返回顶部</a></span>
<script type="text/javascript">_attachEvent(window, 'scroll', function () { showTopLink(); });</script>
</body>
</html>。
