javascript Sina pop-under advertising implementation code_advertising code

I checked Sina's js code today and found a rear-projection advertising code, which is good from both a learning perspective and a usage perspective. However, I found a problem and it will be blocked.
The following is the specific js code

Copy the code The code is as follows:

/*
Carousel rear projection RotatorPB v3.1
Update by Dakular 2008-8-25
Format: new RotatorPB (Ad array)
Description: Randomly appear on the first visit, and rotate in order on subsequent visits; automatically filter out expired ads; cookie time is 24 hours; do not display when the number of commercial ads is insufficient
*/
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;
//Filter invalid ads
for(var i=0; i var start = RotatorPB.strToDate(rad[i][2].replace('','').replace('',''));
    var end = RotatorPB. strToDate(rad[i][3].replace('','').replace('',''),true);
     if(this.date>start && this.date This.ary.push([rad[i][0], rad[i] [1], rad[i][4]]);
                                                                             ; 0;i                                                                                                   {
This.n[i]=g;
D=true;
this.n[i]=0;
                                                                                       (!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                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('

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。