Native js carousel

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Carousel</title>
  <style>
    * {
      margin:0;
      padding:0;
    }
    a{
      text-decoration: none;
    }
    .container {
      position: relative;
      width: 600px;
      height: 400px;
      margin:100px auto 0 auto;
      box-shadow: 0 0 5px #FF3366;
      overflow: hidden;
    }
    .container .wrap {
      position: absolute;
      width: 4200px;
      height: 400px;
      z-index: 1;
    }
    .container .wrap img {
      float: left;
      width: 600px;
      height: 400px;
    }
    .container .buttons {
      position: absolute;
      right: 5px;
      bottom:40px;
      width: 150px;
      height: 10px;
      z-index: 2;
    }
    .container .buttons span {
      margin-left: 5px;
      display: inline-block;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background-color: #D4D4D4;
      text-align: center;
      color:white;
      cursor: pointer;
    }
    .container .buttons span.on{
      background-color: #FF3366;
    }
    .container .arrow {
      position: absolute;
      top: 35%;
      color: #808080;
      padding:0px 14px;
      border-radius: 50%;
      font-size: 50px;
      z-index: 2;
      display: none;
    }
    .container .arrow_left {
      left: 10px;
    }
    .container .arrow_right {
      right: 10px;
    }
    .container:hover .arrow {
      display: block;
    }
    .container .arrow:hover {
      background-color: rgba(0,0,0,0.2);
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="wrap" style="left: -600px;">     
      <img src="./img/jd_app7.png" alt="">
      <img src="./img/jd_app3.png" alt="">
      <img src="./img/jd_app4.png" alt="">
      <img src="./img/jd_app5.png" alt="">
      <img src="./img/jd_app6.png" alt="">
      <img src="./img/jd_app7.png" alt="">
      <img src="./img/jd_app3.png" alt="">
    </div>
    <div class="buttons">
      <span class="on">1</span>
      <span>2</span>
      <span>3</span>
      <span>4</span>
      <span>5</span>
    </div>
    <a href="javascript:;" class="arrow arrow_left"><</a>
    <a href="javascript:;" class="arrow arrow_right">></a>
  </div>
  <script>
    var wrap = document.querySelector(".wrap");
    // left and right arrow switch
    var next = document.querySelector(".arrow_right");
    var prev = document.querySelector(".arrow_left");
    next.onclick = function () {
      next_pic();
    }
    prev.onclick = function () {
      prev_pic ();
    }
    function next_pic () {
      index++;
      if(index > 4){
        index = 0;
      }
      showCurrentDot();
      var newLeft;
      if(wrap.style.left === "-3600px"){
        newLeft = -1200;
      }else{
        newLeft = parseInt(wrap.style.left)-600;
      }
      wrap.style.left = newLeft + "px";
    }
    function prev_pic () {
      index--;
      if(index < 0){
        index = 4;
      }
      showCurrentDot();
      var newLeft;
      if(wrap.style.left === "0px"){
        newLeft = -2400;
      }else{
        newLeft = parseInt(wrap.style.left)+600;
      }
      wrap.style.left = newLeft + "px";
    }
    //Auto rotate
    var timer = zero;
    function autoPlay () {
      timer = setInterval(function () {
        next_pic();
      },2000);
    }
    autoPlay();
 
    var container = document.querySelector(".container");
    container.onmouseenter = function () {
      clearInterval(timer);
    }
    container.onmouseleave = function () {
      autoPlay();  
    }
 	//Click the small dot below the carousel to switch pictures
    var index = 0;
    var dots = document.getElementsByTagName("span");
    function showCurrentDot () {
      for(var i = 0, len = dots.length; i < len; i++){
        dots[i].className = "";
      }
      dots[index].className = "on";
    }
 
    for (var i = 0, len = dots.length; i < len; i++){
      (function(i){
        dots[i].onclick = function () {
          var dis = index - i;
          if(index == 4 && parseInt(wrap.style.left)!==-3000){
            dis = dis - 5;   
          }
          //Same as using prev and next, there will be problems when using the first photo 5 and the final photo 1, resulting in errors in symbols and digits, and you can deal with them accordingly.
          if(index == 0 && parseInt(wrap.style.left)!== -600){
            dis = 5 + dis;
          }
          wrap.style.left = (parseInt(wrap.style.left) + dis * 600)+"px";
          index = i;
          showCurrentDot();
        }
      })(i);      
    }
  </script>
</body>
</html>
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