Vue 滚动条定位问题

$('.findcar_brand_ul').animate({scrollTop: liheight}, 300);

//方法2。js操作 
                var jump = document.querySelector('#postion');
                var total = jump.offsetTop;//要定位的目标滚动条位置
                console.log('纵坐标', total)
                // var distance = document.documentElement.scrollTop || document.body.scrollTop

                 var distanceDom = document.querySelector('.findcar_brand_ul');//滚动条所在的容器
                var distance = distanceDom.scrollTop;//容器的滚动条照度


                // 平滑滚动，每1ms一跳，共20跳
                var time = 15;//毫秒
                var stepnum = 20;//共20跳
                //时长(time*stepnum) ms


                var step = total / stepnum //因为除法会出现余数情况 导致最终定位有偏差
                if (total > distance) {
                    // console.log('smoothDown')
                    // console.log('distance:'+distance)
                    // console.log('total:'+total)
                    smoothDown()
                } else {
                    // var newTotal = distance - total + 100
                    var newTotal = distance - total
                    step = newTotal / stepnum
                    // console.log('smoothUp')
                    smoothUp()
                }
                function smoothDown () {
                    if (distance < total) {
                        // console.log('distance < total')
                        distance += step
                        // Firefox
                        // document.documentElement.scrollTop = distance
                        // // Chrome
                        // document.body.scrollTop = distance

                        distanceDom.scrollTop = distance;
                        setTimeout(smoothDown, time)
                    } else {
                        // console.log('distance < total: else ')
                        // document.documentElement.scrollTop = total
                        // // document.body.scrollTop = total
                        // window.pageYOffset = total

                        // console.log('standard:'+standard)
                        distance = total;//将最后一小步的滚动操作的偏移量还原到目标位置。若不加此操作 会导致定位偏移不准的情况出现。因为step = newTotal / stepnum 的值会有除不尽的情况  !!important
                        // console.log('distance end:'+distance)
                        distanceDom.scrollTop = distance;
                    }
                }
                function smoothUp () {
                    if (distance > total) {
                        distance -= step

                        // // Firefox
                        // document.documentElement.scrollTop = distance
                        // // Chrome
                        // document.body.scrollTop = distance

                        distanceDom.scrollTop = distance;
                        setTimeout(smoothUp, time)
                    } else {
                        // document.documentElement.scrollTop = total
                        // document.body.scrollTop = total
                        // window.pageYOffset = total

                        distance = total;
                        distanceDom.scrollTop = distance;
                    }
                }