FIG rotation seamless 1

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../move.js"></script>
    <style>
        .banner{width:1000px;height:300px;margin: 20px auto;position: relative;overflow: hidden}
        .imgbox{position: absolute;left:0;
            height: 300px;}
        .imgbox img{width: 1000px;height:300px;float:left;}

        .btns input{position: absolute;top:130px;width:40px;height:40px;border: none;background: rgba(200,200,200,0.5);}
        #left{left:0}
        #right{right:0}
    </style>
</head>
<body>
<div class="banner">
    <div class="imgbox">
    <img src="img/1.jpg" alt="">
    <img src="img/2.jpg" alt="">
    <img src="img/3.jpg" alt="">
    <img src="img/4.jpg" alt="">
    <img src="img/5.jpg" alt="">
    <!-- W1.复制第一张图片在最后，做过渡用 -->
    <img src="img/1.jpg" alt="">
</div>

    <div class="btns">
        <input type="button" id="left" value="<<<">
        <input type="button" id="right" value=">>>">
    </div>
</div>
</body>
<script>
    function Banner() {
        this.left=document.querySelector("#left")
        this.right=document.querySelector("#right")
        this.imgs=document.querySelectorAll(".imgbox img");
        this.imgbox=document.querySelector(".imgbox")
        this.imgbox.style.width = this.imgs.length * this.imgs[0].offsetWidth + "px";
        this.index=0;
        this.init()
    }
    Banner.prototype.init=function () {
        var that = this;

        this.right.onclick = function () {
            that.changeIndex1 (); 

        } 
        the this .left.onclick = function () { 
            that.changeIndex2 (); 
        }; 
    } 
    Banner.prototype.changeIndex1 = function () {
       IF ( the this .index === the this .imgs.length- . 1 ) {
           // W2 of the last time when the index back to the second real images, index. 1. 
          the this .index =. 1 ;
           // . after W3 index set, the left imgbox an initial value of the left : 0 
          // Move be from left: width1000 0 * came -index1 
          the this .imgbox.style.left = 0 
      } 
      the else {
          the this .index ++ ; 
      } 
      the this .display (); 
    }; 
    Banner.prototype.changeIndex2 = function () {
       IF ( the this .index == 0 ) {
           // a first when the cited back penultimate photos index 2-bit length 
          the this .index = the this .imgs.length-2 ;
           // after the index set, the initial value is set to left -5000px (i.e. left values shown in FIG last). 
          // Move will come from -5000 * 1000 -index 
          the this .imgbox.style.left = - ( the this .imgs.length-. 1) * the this .imgs [0] + .offsetWidth "PX"
 //          console.log(-(this.imgs.length-1)*this.imgs[0].offsetWidth)
      }
      else{
          this.index--
      }
      this.display()
    };
    Banner.prototype.display=function () {
      move(this.imgbox,{
          left:-this.imgs[0].offsetWidth*(this.index)
        })
    };
    new Banner()
</script>
</html>

Starter Edition

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .banner{width:1000px;height:300px;margin: 20px auto;position: relative;overflow: hidden;}
        .imgbox{position: absolute;left:0;}
        .imgbox img{width: 1000px;height:300px;float:left;}

        .btns input{position: absolute;top:130px;width:40px;height:40px;border: none;background: rgba(200,200,200,0.5);}
        #left{left:0}
        #right{right:0}
    </style>
</head>
<body>
    <div class="banner">
        <div class="imgbox">
            <img src="img/1.jpg" alt="">
            <img src="img/2.jpg" alt="">
            <img src="img/3.jpg" alt="">
            <img src="img/4.jpg" alt="">
            <img src="img/5.jpg" alt="">
            <!-- W1.复制第一张图片在最后，做过渡用 -->
            <img src="img/1.jpg" alt="">
        </div>
        <div class="btns">
            <input type="button" id="left" value="<<<">
            <input type="button" id="right" value=">>>">
        </div>
    </div>
</body>
<script src="../move.js"></script>
<script>
    // OOA:
    // OOD:
    // OOP:
    function Banner(){
        this.left = document.getElementById("left")
        this.right = document.getElementById("right")
        this.imgbox = document.querySelector(".imgbox")
        this.img = this.imgbox.children;

        this.imgbox.style.width = this.img.length * this.img[0].offsetWidth + "px";

        this.index = 0;

        this.init()
    }
    Banner.prototype.init = function(){
        var that = this;
        this.left.onclick = function(){
            that.changeIndex(1)
        }
        this.right.onclick = function(){
            that.changeIndex(-1)
        }
    }
    = Function Banner.prototype.changeIndex (type) { 
        IF (type ==. 1) { 
            IF (this.index == 0) { 
                this.index = this.img.length-2; 
                this.imgbox.style.left = - (-this.img.length. 1) * this.img [0] + .offsetWidth "PX"; 
            } the else { 
                this.index--; 
            } 
        } {the else 
            IF (this.index. 1-== this.img.length ) { 
                // when W2 of the last index, the second back to the real images, index. 1. 
                this.index =. 1; 
                then // W3 index set, to the left imgbox set to an initial value left.: 0 
                // Move be from left: * width1000 come -index1 0 
                this.imgbox.style.left = 0; 
            } the else {
                this.index++
            }
        }
        this.display();
    }
    Banner.prototype.display = function(){
        move(this.imgbox,{
            left:-this.index * this.img[0].offsetWidth
        })
    }

    new Banner();

</script>
</html>

FIG rotation seamless 1

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