周末也很忙
被骂不可避免，爱吃不吃
6月
17
昨天美工在那弄js的漂浮，唠唠叨叨的，后来我决定帮他看看。记得javascript漂浮的代码满网都是，于是顺手去网上摘了几段回来用了，可是没想到哦那个嫁接出来的代码居然不支持W3C标准，有的方法居然无法侦测到浏览器的下边缘坐标，漂浮代码失效的原因如下：
在使用以下声明时，会使一个最常用的漂浮下拉广告失效。
直接导致document.body.scrollTop永远等于0，body Scroll永远也不会引发。
所以我把document.body用document.documentElement替换掉，结果就好用了。
完整的符合W3C标准的js漂浮代码如下：
HTML部分
JavaScript部分,另存为js.js
var xPos = 300;
var yPos = 200;
var step = 1;
var delay = 30;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
img1.style.top = yPos;
function changePos()
{
width = document.documentElement.clientWidth;
height = document.documentElement.clientHeight;
Hoffset = img1.offsetHeight;
Woffset = img1.offsetWidth;
img1.style.left = xPos + document.documentElement.scrollLeft;
img1.style.top = yPos + document.documentElement.scrollTop;
if (yon)
{yPos = yPos + step;}
else
{yPos = yPos - step;}
if (yPos < 0)
{yon = 1;yPos = 0;}
if (yPos >= (height - Hoffset))
{yon = 0;yPos = (height - Hoffset);}
if (xon)
{xPos = xPos + step;}
else
{xPos = xPos - step;}
if (xPos < 0)
{xon = 1;xPos = 0;}
if (xPos >= (width - Woffset))
{xon = 0;xPos = (width - Woffset); }
}
function start()
{
img1.visibility = "visible";
interval = setInterval('changePos()', delay);
}
function pause_resume()
{
if(pause)
{
clearInterval(interval);
pause = false;}
else
{
interval = setInterval('changePos()',delay);
pause = true;
}
}
start();
在使用以下声明时，会使一个最常用的漂浮下拉广告失效。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitiona...
<html xmlns="http://www.w3.org/1999/xhtml">
<html xmlns="http://www.w3.org/1999/xhtml">
直接导致document.body.scrollTop永远等于0，body Scroll永远也不会引发。
所以我把document.body用document.documentElement替换掉，结果就好用了。
完整的符合W3C标准的js漂浮代码如下：
HTML部分
<DIV id=img1 style="Z-INDEX: 100; LEFT: 2px; WIDTH: 120px; POSITION: absolute; TOP: 43px; HEIGHT: 70px; visibility: visible;">
<a href="http://2008.cga.com.cn" target="_blank"><img src="{dede:field name='templeturl'/}/v200805/images/pic6.15.gif" width="120" height="70" border="0"></a>
<table width="40" border="0" align="right" cellpadding="0" cellspacing="0">
<tr>
<td width="40" align="center"><a href="#" onClick="javascript:document.getElementById('img1').style.visibility='hidden';" style="font-size:12px; color:#CC3300; text-decoration:none;">关 闭</a></td>
</tr>
</table>
</DIV>
<SCRIPT src="{dede:field name='templeturl'/}/v200805/js/js.js"></SCRIPT>
<a href="http://2008.cga.com.cn" target="_blank"><img src="{dede:field name='templeturl'/}/v200805/images/pic6.15.gif" width="120" height="70" border="0"></a>
<table width="40" border="0" align="right" cellpadding="0" cellspacing="0">
<tr>
<td width="40" align="center"><a href="#" onClick="javascript:document.getElementById('img1').style.visibility='hidden';" style="font-size:12px; color:#CC3300; text-decoration:none;">关 闭</a></td>
</tr>
</table>
</DIV>
<SCRIPT src="{dede:field name='templeturl'/}/v200805/js/js.js"></SCRIPT>
JavaScript部分,另存为js.js
var xPos = 300;
var yPos = 200;
var step = 1;
var delay = 30;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
img1.style.top = yPos;
function changePos()
{
width = document.documentElement.clientWidth;
height = document.documentElement.clientHeight;
Hoffset = img1.offsetHeight;
Woffset = img1.offsetWidth;
img1.style.left = xPos + document.documentElement.scrollLeft;
img1.style.top = yPos + document.documentElement.scrollTop;
if (yon)
{yPos = yPos + step;}
else
{yPos = yPos - step;}
if (yPos < 0)
{yon = 1;yPos = 0;}
if (yPos >= (height - Hoffset))
{yon = 0;yPos = (height - Hoffset);}
if (xon)
{xPos = xPos + step;}
else
{xPos = xPos - step;}
if (xPos < 0)
{xon = 1;xPos = 0;}
if (xPos >= (width - Woffset))
{xon = 0;xPos = (width - Woffset); }
}
function start()
{
img1.visibility = "visible";
interval = setInterval('changePos()', delay);
}
function pause_resume()
{
if(pause)
{
clearInterval(interval);
pause = false;}
else
{
interval = setInterval('changePos()',delay);
pause = true;
}
}
start();
