javascript 新浪背投广告实现代码

今天查看了下新浪的js代码，发现一个背投的广告类代码，不论是从学习角度还是使用角度都是不错的，但发现了一个问题，会被屏蔽的。
下面是具体的js类代码

/*
轮播背投类 rotatorpb v3.1
update by dakular <[e-mail]> 2008-8-25
格式：new rotatorpb(广告数组)
说明：第一次访问随机出现，以后访问顺序轮播；自动过滤过期广告；cookie时间24小时；商业广告数量不足时不显示
*/
if(typeof(rotatorpb)!='function'){
    var rotatorpb=function (rad){
        this.ary = new array();
        this.date = new date();
        this.w = rad.width;
        this.h = rad.height;
        this.num = rad.num;
        this.o = rad.length;
        this.id = rotatorpb.id++;
        this.m = 'rpb_'+this.id;
        this.n = new array();
        this.l = new date();
        this.e = 0;
        var f;
        var d = false;
        var nn = 0;
        //过滤无效广告
        for(var i=0; i<rad.length; i++){
            var start = rotatorpb.strtodate(rad[i][2].replace('<startdate>','').replace('</startdate>',''));
            var end = rotatorpb.strtodate(rad[i][3].replace('<enddate>','').replace('</enddate>',''),true);
            if(this.date>start && this.date<end && (this.num==null || this.ary.length<this.num) ){
                this.ary.push([rad[i][0], rad[i][1], rad[i][4]]);
            }
        }
        this.o = this.ary.length;
        //取id
        for(var i=0;i<this.o;i++){
            f=this.m+'_'+(i+1);
            g=rotatorpb.g(f);
            if(g!=''){
                this.n[i]=g;
                d=true;
            }else {
                this.n[i]=0;
            }
        }
        if(!d){
            var r=math.ceil(math.random()*this.o);
            var t=this.m+'_'+r;
            rotatorpb.s(t,this.l.gettime(),1440);
            this.e=r;
            if(this.o==1){rotatorpb.s('s_dl',r,1440);}
            //return r;
        }else {
            var r=this.n.join(',').split(',');
            var k=r.sort();
            var max=number(k[k.length-1]);
            var min=number(k[0]);
            var f;
            for(var i=0;i<this.n.length;i++){
                if(max==this.n[i]){
                    f=i+1;
                    break;
                }
            }
            if(typeof(f)!='undefined'){
                g=this.m+'_'+f;
                h=number(rotatorpb.g(g));
                i=f%this.o+1;
                j=this.m+'_'+i;
                rotatorpb.s(j,this.l.gettime(),1440);
                if(this.o==1){
                    i=-rotatorpb.g('s_dl');
                    if(i==0){i=1;rotatorpb.s('s_dl',1,1440);}
                    rotatorpb.s('s_dl',i,1440);
                }
                this.e=i;
                //return i;
            }
        }
        //show ad
        if(this.e==0 || this.ary.length==0) return; //如果没有广告则不显示
        if(this.e==-1) return; //当只有一个广告时：始终显示第一个/奇数次刷新显示
        var n = this.e-1;
        var btsrc = this.ary[n][0];
        var bturl = this.ary[n][1];
        var bttype = btsrc.substring(btsrc.length-3).tolowercase();
        if(bttype=='.js'){ //js
            document.write('<script language="javascript" type="text/javascript" src="'+btsrc+'"></scr'+'ipt>'); return;
        }else if(bttype!='htm' && bttype!='tml'){
            sinabturl = "http://d1.sina.com.cn/d1images/pb/pbv4.html?"+bturl+"${}"+bttype+"${}"+btsrc;
        }else{
            sinabturl = btsrc;
        }
        try{
            aryadseq.push("openwindowback()");
        }catch(e){
            openwindowback();
        }
        if(this.ary[n][2]!=""){ //监测计数
            var oimg = new image();
            oimg.src = this.ary[n][2];
        }
    };
    rotatorpb.id=1;
    rotatorpb.g=function (n){
        var c=document.cookie.split("; ");
        for(var i=0;i<c.length;i++){
            var d=c[i].split("=");
            if(d[0]==n)return unescape(d[1]);
        }return '';
    };
    rotatorpb.s=function (n,v,q){
        var l=new date();
        var z=new date(l.gettime()+q*60000);
        document.cookie=n+"="+escape(v)+"; path=/; expires="+z.togmtstring()+";";
    };
    rotatorpb.strtodate = function(str,ext){
        var arys = new array();
        arys = str.split('-');
        var newdate = new date(arys[0],arys[1]-1,arys[2],9,0,0);
        if(ext){
            newdate = new date(newdate.gettime()+1000*60*60*24);
        }
        return newdate;
    }
    var openwindowback = function(){
        var popupwin2 = open(sinabturl, (window.name!="popupwin2")?"popupwin2":"", "width=1,height=1,top=4000,left=3000");
    }
};

具体的调用代码：

<script src="rotator_pb.js"></script>
<script language=javascript type=text/javascript>
//<![cdata[
var rpb = new array();
rpb.num = 2; //轮播数量
<!--2220e7b88d58-->//背投广告创意
rpb.push(["http://img.jb51.net/demo/images/beitou.jpg", "https://www.jb51.net", "<startdate>2009-4-15</startdate>", "<enddate>2009-8-15</enddate>", ""]);
<!--$$ litong/2009-4-15 ~ 2009-8-15/b $-->
new rotatorpb(rpb);
//]]>
</script>

上面的beitou.jpg是图片的地址，后面的是链接， 开始日期 结束日期什么的大家参考下就可以了。