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
复制代码 代码如下:
/*
轮播背投类 rotatorpb v3.1
update by dakular 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            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]]);
            }
        }
        this.o = this.ary.length;
        //取id
        for(var i=0;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                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('
具体的调用代码：
复制代码 代码如下:
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。