<!--全屏开始--><!--interstitial begin-->       <SCRIPT language=JavaScript>  <!-- //时间计算 SYfullscreen=false; today=new Date(); function testdate() {     if(today.getMonth()=='2') //是否为3月         {             if(today.getDate()=='15') //是否为15日             { <!--725A3E8355CB-->//全屏开始 if(today.getHours()>='14' && today.getHours()<'15') {         adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html? http://sina.allyes.com/main/adfclick? db=sina&bid=73474,105318,105433&cid=0,0,0&sid=97875&advid=3716&camid=14291&show=ignore&url=http://61.49.38.5/tzhddoc/index.ht m${}/upload/2007315152115702.jpg';SYfullscreen=true                                 }<!--$$ huiyan/2007-3-15 14:00:01 ~ 2007-3-15 14:59:59/B $--> <!--4774607C08FD-->//全屏开始 if(today.getHours()>='8' && today.getHours()<'9') {         adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html? http://sina.allyes.com/main/adfclick? db=sina&bid=73474,105318,105433&cid=0,0,0&sid=97875&advid=3716&camid=14291&show=ignore&url=http://61.49.38.5/tzhddoc/index.ht m${}/upload/2007315152115903.JPG';SYfullscreen=true                             }<!--$$ raowei/2007-3-15 ~ 2007-3-16 两天勿撤，谢谢！/B $--> <!--35F6B37FB5E4-->//全屏开始 if(today.getHours()>='16' && today.getHours()<'17') {         adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html? http://sina.allyes.com/main/adfclick? db=sina&bid=70483,101960,102064&cid=0,0,0&sid=94712&advid=3254&camid=13506&show=ignore&url=http://www.sagitar.com.cn/${} /upload/2007315152115985.GIF';SYfullscreen=true                     }<!--$$ limeng/2007-3-15 16:00:01 ~ 2007-3-15 16:59:59/B $--> <!--C5EB1D51E54C-->//全屏开始 if(today.getHours()>='17' && today.getHours()<'18') {         adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html? http://sina.allyes.com/main/adfclick? db=sina&bid=73214,104975,105088&cid=0,0,0&sid=97562&advid=3705&camid=14237&show=ignore&url=http://adclient.dentsu.com.cn/html .ng/adspec=Flash&adtype=single_dui_lian&affiliate=sina&campaignid=842&channel=aoyun_page&log=0¶ms.styles=clickcmd?${} /upload/2007315152115273.jpg';SYfullscreen=true                     }<!--$$ limeng/2007-3-15 17:00:01 ~ 2007-3-15 17:59:59/B $--> <!--D4C112442CAF-->//全屏开始 if(today.getHours()>='18' && today.getHours()<'19') {         adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html? http://sina.allyes.com/main/adfclick? db=sina&bid=73271,105059,105175&cid=0,0,0&sid=97643&advid=3254&camid=14234&show=ignore&url=http://www.sagitar.com.cn/olympic$ {}/upload/2007315152115162.jpg';SYfullscreen=true                 }<!--$$ limeng/2007-3-15 ~ 2007-3-15/B $--> }}} testdate(); var MSIE=navigator.userAgent.indexOf("MSIE"); var OPER=navigator.userAgent.indexOf("Opera"); if(SYfullscreen==true) {     if (document.all && MSIE!=-1 && OPER==-1) {      // this is a 4.x browser, no?  function changediv(){     document.getElementById('hiddenLayer').style.display = "block";     document.getElementById('interstitialFrame').src = adInterPath;     setTimeout("hidediv()",5000) } function hidediv(){     document.getElementById('hiddenLayer').style.display="none";     SYtag=2; } function showfull(){     setTimeout("changediv()",2000);  } showfull();     } } // --> </SCRIPT>       <SCRIPT language=JavaScript>  <!-- if(SYfullscreen==true) {     if (document.all && MSIE!=-1 && OPER==-1) {      // this is a 4.x browser, no?          document.write('<DIV ID="hiddenLayer" style="display: none; height: 450px;">');         expandableIframe = '<IFRAME id="interstitialframe" width=750 HEIGHT=450 NORESIZE SCROLLING=No FRAMEBORDER=0  MARGINHEIGHT=0 MARGINWIDTH=0></IFRAME>';         document.write(expandableIframe); } document.write('</div>'); } // --> </SCRIPT> <!--interstitial end--><!--全屏结束--> 说明新浪主要是根据时间段来显示不同的广告,然后将动态控制iframe来显示广告 有个重要的文件 [url=http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html]http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html[/url] 的代码如下,用${}作为分割符,利用了数组 ary[0]为连接地址 ary[1]为图片地址