JQuery页面图片切换和新闻列表滚动效果的具体实(6)

var _temp = numRoll<0?scrollSize:0;
                t=0;
                b=_scrollObj[_dir];
                //c=(pPos != undefined)?pPos:_neg*opts.distance;
                e=(pPos != undefined)?pPos:_temp+(opts.distance*numRoll)%scrollSize;
                if(_neg==1){
                    if(e>b){
                        c = e-b;
                    }else{
                        c = e+scrollSize -b;
                    }
                }else{
                    if(e>b){
                        c =e-scrollSize-b;
                    }else{
                        c = e-b;
                    }
                }
                d=opts.duration;

                //scrollId = setInterval(scrollFunc, opts.scrollDelay);
                if(scrollId) clearTimeout(scrollId);
                scrollId = setTimeout(scrollFunc, opts.scrollDelay);
            }

            function start(){
                rollId = setInterval(function(){
                    rollFunc();
                }, opts.time*1000);
            }
            function stop(){
                clearInterval(rollId);
            }

            function easeOutQuad(t,b,c,d){
                return -c *(t/=d)*(t-2) + b;
            }

            function easeOutQuint(t,b,c,d){
                return c*((t=t/d-1)*t*t*t*t + 1) + b;
            }