最近更新网站首页广告，ASP.NET的广告控件很容易实现这点，可首页是静态页面，联想广告控件的原理决定采用javascript+xml实现这点方面配置，更新广告时只要更新xml即可，方便了广告轮换
xml结构如下
<ad>
<tupian>http://www.seehaha.com/images/060901-150.100.2.gif</tupian>
<tupian>http://www.seehaha.com/xml/061009-300.100.jpg</tupian>
<dizhi>http://www.seehaha.com/plan/</dizhi>
<dizhi>http://www.seehaha.com/va.htm</dizhi>
</ad>
==
// JScript 文件
var Now = new Date();
var Min = Now.getSeconds();
var i;
if((Min % 2) == 1)//读取秒数，根据奇偶随机轮换，当然也可以改变此处算法增加xml节点数
{
i = 1;
}
else
{
i = 0;
}
var url = "xml/ads.xml";
String.prototype.Trim = function() { return this.replace(/(^s*)|(s*$)/g, ""); }
var xmlDoc;//判断是否为Firefox或IE
var moz = (typeof document.implementation != 'undefined') && (typeof document.implementation.createDocument != 'undefined');
var ie = (typeof window.ActiveXObject != 'undefined');
function importXML(file)
{
if (moz)
{
xmlDoc = document.implementation.createDocument("", "doc", null);//创建FIREFOX下XML文档对象
}
else if (ie)
{
xmlDoc = new ActiveXObject("MSXML2.DOMDocument.3.0");
xmlDoc.async = false; while( xmlDoc.readyState != 4) {};//创建IE下XML文档对象 }
xmlDoc.load(file);}importXML(url);//载入xmlfunction updatetupiandizhi(){if (moz) { var ad = xmlDoc.getElementsByTagName("ad")[0]; var tupian; var _tupian = ad.getElementsByTagName("tupian")[i].firstChild.nodeValue; if (_tupian) tupian = _tupian.Trim(); //得到tupian,dizhi节点下的值 var dizhi; var _dizhi=ad.getElementsByTagName("dizhi")[i].firstChild.nodeValue; if(_dizhi) dizhi = _dizhi.Trim(); document.getElementById('tupian').href = tupian; document.getElementById('dizhi').src = dizhi; //实现轮换 } else if (ie) {var src = xmlDoc.documentElement.selectNodes("tupian");var href = xmlDoc.documentElement.selectNodes("dizhi");/得到tupian,dizhi节点下的值document.getElementById("dizhi").href = href(i).text;document.getElementById("tupian").src = src(i).text; //实现轮换 }}
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