我正在使用這個進(jìn)度條： https ://codepen.io/thegamehasnoname/pen/JewZrm我遇到的問題是它循環(huán)，我想要實現(xiàn)的是：停止在最后一張進(jìn)度幻燈片上（停止循環(huán)）。如果用戶在進(jìn)度條停止后位于最后一張幻燈片上，并且我單擊按鈕，則它應(yīng)該從上一張幻燈片開始，而不是進(jìn)度條的第一張幻燈片。.button-prev這是代碼：// swiper custom progressbarconst progressContainer = document.querySelector('.progress-container');const progress = Array.from(document.querySelectorAll('.progress'));const status = document.querySelector('.status');const playNext = (e) => {  const current = e && e.target;  let next;  if (current) {    const currentIndex = progress.indexOf(current);    if (currentIndex < progress.length) {      next = progress[currentIndex+1];    }    current.classList.remove('active');    current.classList.add('passed');  }  if (!next) {    progress.map((el) => {      el.classList.remove('active');      el.classList.remove('passed');    })    next = progress[0];  }  next.classList.add('active');}progress.map(el => el.addEventListener("animationend", playNext, false));playNext();我嘗試添加這個：if (current) {   if (!next) {     $('.progress-container div').addClass('passed');   }}但是該類passed被刪除并且進(jìn)度條再次開始。這是我的js previous button：$(document).on('click', ".button-prev", function() {  $('.progress-container div.active').prev().removeClass('passed').addClass('active');  $('.progress-container div.active').next().removeClass('active');});關(guān)于如何實現(xiàn)這一目標(biāo)有什么想法嗎？