javascript 随机广告代码(图片广告)

//****END 6-25***// 
var adsAry_length = tag1.length; 
var now = new Date(); 
//MOD 20090522var sec = now.getSeconds(); 
//MOD 20090522 var ad = sec % adsAry_length; 
var sec =now.getTime(); 
var ad = rand(adsAry_length) 
var url = urlArray[ad-1]; 
var banner = tag1[ad-1]; 
//DEL alert("urlArray[" +(ad-1)+"]=" + urlArray[ad-1]) 
//DEL 20090522 if(ad <= tag1.length){ 
//DEL 20090522    url=urlArray[ad]; 
//DEL 20090522    banner=tag1[ad]; 
//DEL 20090522} 
//DEL 20090522 document.write('<center>'); 
document.writeln('如需引入外部Js需刷新才能执行]</div><BR>这个里面有个不错的随机函数代码，具体的没看懂。知道的朋友可以回复下。<BR><div class="codetitle"><span style="CURSOR: pointer"  onclick="doCopy('code10275')"><U>复制代码</U></span> 代码如下:</div><div class="codebody" id="code10275"><BR>function rnd() { <BR>var ia=9301; <BR>var ic=49297; <BR>var im=233280; <BR>sec = (sec*ia+ic) % im; <BR>return sec/(im*1.0); <BR>}; <BR></div>

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