JS实现无限轮播无倒退效果

.slide-container {
  max-width: 1230px;
  margin: auto;
  overflow: hidden;
 }
 .slide-container li {
  float: left;
 }
 .slide-container img {
  width: 100%;
 }

let orgLen, canMove, curLi, curLen,
  slider = null,
  interval = null,
  curImgIndex = 0;
 
 function initSlider() {
  let orgLiArray = document.querySelectorAll('.slide-container li');
 
  orgLen = orgLiArray.length;
  canMove = true;
  slider = $('.slide-container');
 
  addLi();
  setStyle();
 
  //添加li
  function addLi() {
  for (let i = 0; i = orgLen) { //到达边界回到初始状态
    curImgIndex = 0;
    slider.find('ul').css({
    'transform': 'translateX(0)'
    });
   }
   canMove = true;
   startInterval();
   }, 20);
  }, 500);
  }, 20);
 }
 
 function startInterval() {
  interval = setInterval(function () { //开始轮播
  curImgIndex++;
  move(curImgIndex);
  },2000);
 }
 
 initSlider();
 startInterval();

//统一处理滚轮滚动事件
 function wheel(event) {
  var delta = 0;
  if (!event) event = window.event;
  if (event.wheelDelta) { //IE、chrome浏览器使用的是wheelDelta，并且值为“正负120”
  delta = event.wheelDelta / 120;
  if (window.opera)
 
  //因为IE、chrome等向下滚动是负值，FF是正值，为了处理一致性，在此取反处理
   delta = -delta;
  } else if (event.detail) { //FF浏览器使用的是detail,其值为“正负3”
  delta = -event.detail / 3;
  }
  if (delta) {
  handle(delta);
 
  //阻止事件冒泡和屏幕向下滚动
  event.preventDefault() && event.stopPropagation();
  }
 
 }
 
 //上下滚动时的具体处理函数
 function handle(delta) {
  //向上滚动
  if (delta <0 && canMove) {
  curImgIndex++;
  move(curImgIndex);
  } else if (delta > 0 && canMove) { //向下滚动
  curImgIndex--;
  move(curImgIndex);
  }
 }

//兼容性写法
if (window.addEventListener) //FF,火狐浏览器会识别该方法
 slider.get(0).addEventListener('DOMMouseScroll', wheel, false);
 slider.get(0).Onmousewheel= wheel; //W3C