代码分两个部分:1、HTML部分,根据注释处理即可;2、play.js插件部分,引到HTML里面即可。

1、HTML部分:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
  <style>/*style标签及其内的内容,在实际项目中可以不要*/
    * {
      margin: 0;
      padding: 0;
    }
  </style>
</head>
<body>
<!--body标签里的内容,没说可以增减或更改的,不要增减或更改-->
<div id="box">
  <div>
    <!--以下是可增减区域-->
    <div><img src="/UploadFiles/2021-04-02/banner1.jpg">

2、play.js插件部分

function Banner(width, height) {/*类*/
  /*以下最外层div*/
  var that = this;
  this.width = width;
  this.height = height;
  this.oBox = document.getElementById("box");
  this.oBox.style.width = width;
  this.oBox.style.height = height;
  this.oBox.style.margin = "0 auto";
  this.oBox.style.overflow = "hidden";
  this.oBox.style.position = "relative";
  /*以下轮播区的div*/
  this.oBoxInner = this.oBox.getElementsByTagName('div')[0];
  this.oBoxInner.style.height = height;
  this.oBoxInner.style.position = "absolute";
  this.oBoxInner.style.left = 0;
  this.oBoxInner.style.right = 0;
  this.aDiv = this.oBoxInner.getElementsByTagName('div');//单个轮播图
  this.oBoxInner.innerHTML/* 轮播区的内部后面*/ += this.aDiv[0].outerHTML/*第一个轮播图片的外部*/;
  this.oBoxInner.style.width = parseFloat(width) * this.aDiv.length + "px";//轮播区的宽度
  for (var i = 0; i < this.aDiv.length; i++) {/*遍历轮播区的每个div及其内部的图片*/
    this.aDiv[i].style.width = width;
    this.aDiv[i].style.height = height;
    this.aDiv[i].style.float = "left";
    this.aDiv[i].aImg = this.aDiv[i].getElementsByTagName('img')[0];
    this.aDiv[i].aImg.style.width = "100%";
    this.aDiv[i].aImg.style.height = "100%";
  }
  /*以下是焦点区部分(定位在轮播区的右下方)*/
  var oUl=document.createElement('ul');
  for(i=0; i<this.aDiv.length-1; i++){
    oUl.innerHTML+='<li class='+i+'===1"on":null></li>';
  }
  this.oBox.appendChild(oUl);
  this.oUl = this.oBox.getElementsByTagName('ul')[0];
  this.oUl.style.position = "absolute";
  this.oUl.style.right = "10px";
  this.oUl.style.bottom = "10px";
  this.aLi = this.oUl.getElementsByTagName('li');
  for (i = 0; i < this.aLi.length; i++) {/*遍历焦点区的每个焦点*/
    this.aLi[i].style.width = "18px";
    this.aLi[i].style.height = "18px";
    this.aLi[i].style.float = "left";
    this.aLi[i].style.listStyle = "none";
    this.aLi[i].style.background = "green";
    this.aLi[i].style.borderRadius = "50%";
    this.aLi[i].style.marginLeft = "10px";
    this.aLi[i].style.cursor = "pointer";
  }
  /*以下是向左向右两个箭头式按钮*/
  for(i=0; i<2; i++){
    var oA=document.createElement('a');
    oA.href="javascript:;" rel="external nofollow" 
    this.oBox.appendChild(oA);
  }
  /*以下是左按钮(点击它,图片向左运动)*/
  this.oBtnL = this.oBox.getElementsByTagName('a')[0];
  this.oBtnL.style.width = "30px";
  this.oBtnL.style.height = "30px";
  this.oBtnL.style.position = "absolute";
  this.oBtnL.style.top = (parseFloat(this.height) / 2 - 15) + "px";
  this.oBtnL.style.left = "30px";
  this.oBtnL.style.border = "10px solid red";
  this.oBtnL.style.borderLeft = "none";
  this.oBtnL.style.borderBottom = "none";
  this.oBtnL.style.opacity = "0.3";
  this.oBtnL.style.filter = "alpha(opacity=30)";
  this.oBtnL.style.display = "none";
  this.oBtnL.style.transform = "rotate(-135deg)";
  this.oBtnL.onclick = function () {
    if (that.step <= 0) {
      that.step = that.aDiv.length - 1;
      that.css(that.oBoxInner, 'left', -that.step * parseFloat(that.width));
    }
    that.step--;
    that.animate(that.oBoxInner, {left: -that.step * parseFloat(that.width)});
    that.bannerTip();
  };
  /*以下是右按钮(点击它,图片向右运动)*/
  this.oBtnR = this.oBox.getElementsByTagName('a')[1];
  this.oBtnR.style.width = "30px";
  this.oBtnR.style.height = "30px";
  this.oBtnR.style.position = "absolute";
  this.oBtnR.style.top = (parseFloat(this.height) / 2 - 15) + "px";
  this.oBtnR.style.right = "30px";
  this.oBtnR.style.border = "10px solid red";
  this.oBtnR.style.borderLeft = "none";
  this.oBtnR.style.borderBottom = "none";
  this.oBtnR.style.opacity = "0.3";
  this.oBtnR.style.filter = "alpha(opacity=30)";
  this.oBtnR.style.display = "none";
  this.oBtnR.style.transform = "rotate(45deg)";
  this.oBtnR.onclick = function () {
    if (that.step >= that.aDiv.length - 1) {
      that.step = 0;
      that.css(that.oBoxInner, 'left', 0)
    }
    that.step++;
    that.animate(that.oBoxInner, {left: -that.step * parseFloat(that.width)}, 1000);
    that.bannerTip();
  };
  /*以下是其它*/
  this.step = 0;//记录每次运动
  this.timer = null;//定时器
  this.init();//初始化轮播图
}
Banner.prototype = {//类的原型
  constructor: Banner,
  /*getCss:获取元素的属性值*/
  getCss: function (curEle, attr) {
    var val = null;
    var reg = null;
    if (getComputedStyle) {//标准浏览器
      val = getComputedStyle(curEle, false)[attr];
    } else {//非标准浏览器
      if (attr === 'opacity') {
        val = curEle.currentStyle.filter; //'alpha(opacity=10)'
        reg = /^alpha\(opacity[=:](\d+)\)$/i;
        return reg.test(val) "on") {
        this.aLi[i].style.background = "red";
      } else {
        this.aLi[i].style.background = "green";
      }
    }
  },
  over_out: function () {
    var _this = this;
    _this.oBox.onmouseover = function () {
      clearInterval(_this.timer);
      _this.oBtnL.style.display = 'block';
      _this.oBtnR.style.display = 'block';
    };
    _this.oBox.onmouseout = function () {
      _this.timer = setInterval(function () {
        _this.autoMove()
      }, 2000);
      _this.oBtnL.style.display = 'none';
      _this.oBtnR.style.display = 'none';
    }
  }
};

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