看不到代碼,沒法判斷

????move(offset)?{????????????this.animate(offset?/*表示位移距離*/?)????????????????//?判斷有幾個索引值并賦值到num????????????const?num?=?this.indexbox.children[0].children.length????????????for?(let?i?=?0;?i?<?num;?i++)?{????????????????//遍歷所有索引的ul里面的li,修改classname為空????????????????this.indexbox.children[0].children[i].className?=?""????????????????????//把當前索引加成active樣式????????????????this.indexbox.children[0].children[this.index?-?1].className?=?"active"????????????}????????}????????/*該方法為緩慢的過渡效果*/????animate(offset)?{????????//?定義切換時間為1000毫秒?1秒????????const?time?=?1000????????????//稍微移動為0.1秒????????const?rate?=?100????????????//計算移動距離????????let?speed?=?offset?/?(time?/?rate)????????????//?計算目標位置使用parseFloat去掉單位????????let?goal?=?parseFloat(this.picBox.style.left)?-?offset????????this.animated?=?true????????//判斷是否到達目標位置????????let?animate?=?setInterval(()?=>?{?//計算去掉單位的目標絕對值減去目標位置的絕對值小于移動距離的絕對值????????????if?(this.picBox.style.left?==?goal?||?Math.abs(Math.abs(parseFloat(this.picBox.style.left))?-?Math.abs(goal))?<?Math.abs(speed))?{????????????????this.picBox.style.left?==?goal????????????????clearInterval(animate)????????????????this.animated?=?false????????????????if?(parseFloat(this.picBox.style.left)?==?0)?{????????????????????this.picBox.style.left?=?-this.sliders?*?this.sliderWidth?+?"px"????????????????}?else?if?(parseFloat(this.picBox.style.left)?==?-(this.sliders?+?1)?*?this.sliderWidth)?{????????????????????this.picBox.style.left?=?-this.sliderWidth?+?"px"????????????????}????????????}?else?{????????????????//未到達目標位置繼續移動????????????????this.picBox.style.left?=?parseFloat(this.picBox.style.left)?-?speed?+?"px"????????????}????????},?rate)????}????leftRight()?{????????this.box.querySelector(".left-box").addEventListener("click",?()?=>?{????????????console.log("left-box")????????????if?(this.animated)?{????????????????return????????????}????????????if?(this.index?-?1?<?1)?{????????????????this.index?=?this.sliders????????????}?else?{????????????????this.index--????????????}????????????this.move(-this.sliderWidth)????????})

你自己對一下吧