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> <div> <!--以下是可增减区域--> <div><img src="https://www.jb51.net/img/banner1.jpg" alt=""/></div> <div><img src="https://www.jb51.net/img/banner2.jpg" alt=""/></div> <div><img src="https://www.jb51.net/img/banner3.jpg" alt=""/></div> <div><img src="https://www.jb51.net/img/banner4.jpg" alt=""/></div> <div><img src="https://www.jb51.net/img/banner5.jpg" alt=""/></div> <div><img src="https://www.jb51.net/img/banner6.jpg" alt=""/></div> <div><img src="https://www.jb51.net/img/banner7.jpg" alt=""/></div> <!--以上是可增减区域--> </div> </div> <script src="https://www.jb51.net/play.js"></script> <script> var play= new Banner('1000px', '500px'); /*这两个参数分别是轮播区的宽和高，可以根据需要更改*/ </script> </body> </html>
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===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:;" 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\(opacity[=:](\d+)\)$/i; return reg.test(val) ? reg.exec(val)[1] / 100 : 1; } val = curEle.currentStyle[attr]; } reg = /^[+-]?((\d|([1-9]\d+))(\.\d+)?)(px|pt|rem|em)$/i; return reg.test(val) ? parseInt(val) : val; }, /*setCss：设置元素的属性值*/ setCss: function (curEle, attr, value) { if (attr === 'float') { curEle.style.cssFloat = value; curEle.style.styleFloat = value; return; } if (attr === 'opacity') { curEle.style.opacity = value; curEle.style.filter = 'alpha(opacity=' + (value * 100) + ')'; return; } var reg = /^(width|height|top|right|bottom|left|((margin|padding)(top|right|bottom|left)?))$/i; if (reg.test(attr)) { if (!(value === 'auto' || value.toString().indexOf('%') !== -1)) { value = parseFloat(value) + 'px'; } } curEle.style[attr] = value; }, /*setGroupCss：设置元素的一组属性值*/ setGroupCss: function (curEle, options) { if (options.toString() !== '[object Object]') return; for (var attr in options) { this.setCss(curEle, attr, options[attr]); } }, /*css：getCss、setCss、setGroupCss的合写*/ css: function () { if (typeof arguments[1] === 'string') { if (typeof arguments[2] === 'undefined') { return this.getCss(arguments[0], arguments[1]);//当第三个参数不存在，是获取； } else { this.setCss(arguments[0], arguments[1], arguments[2]);//当第三个参数存在时，是设置； } } if (arguments[1].toString() === '[object Object]') { this.setGroupCss(arguments[0], arguments[1]);//设置元素的一组属性值 } }, /*animate：轮播图动画函数*/ animate: function (curEle, target, duration) { /*1.定义动画的运行轨迹*/ function tmpEffect(t, b, c, d) { return b + c / d * t;//开始时的位置+总变化/总时间*已经过去的时间 } /*2.为公式的每个参数做准备*/ var begin = {}; var change = {}; for (var attr in target) { begin[attr] = this.css(curEle, attr); change[attr] = target[attr] - begin[attr]; } duration = duration || 700; var time = 0; var that = this; /*3.开启一个定时器，让时间不断累加；根据时间和公式，求出最新的位置；*/ clearInterval(curEle.timer); //开起一个定时器前，先关闭没用的定时器 curEle.timer = setInterval(function () { time += 10; /*4.定时器停止运动的条件（time>=duration）*/ if (time >= duration) { that.css(curEle, target); clearInterval(curEle.timer); return; } /*5.拿到每个属性的最新值，并且赋值给元素对应的属性；*/ for (var attr in target) { var curPos = tmpEffect(time, begin[attr], change[attr], duration); that.css(curEle, attr, curPos); } }, 10) }, /*初始化轮播图*/ init: function () { var _this = this; /*1.开启自动轮播*/ this.timer = setInterval(function () { _this.autoMove(); }, 2000); /*2.开启焦点，每个焦点与每张轮播图对应*/ this.bannerTip(); /*3.鼠标移入轮播区，轮播暂停；鼠标移出轮播区，轮播恢复*/ this.over_out(); /*4.点击焦点，响应对应的轮播图片*/ this.handleChange(); }, handleChange: function () { for (var i = 0; i < this.aLi.length; i++) { this.aLi[i].index = i; var that = this; this.aLi[i].onclick = function () { that.step = this.index; that.animate(that.oBoxInner, {left: -that.step * parseFloat(that.width)}); that.bannerTip(); } } }, autoMove: function () { if (this.step >= this.aDiv.length - 1) { this.step = 0; this.css(this.oBoxInner, 'left', 0) } this.step++; this.animate(this.oBoxInner, {left: -this.step * parseFloat(this.width)}, 1000); this.bannerTip(); }, bannerTip: function () { var tmpStep = this.step >= this.aLi.length ? 0 : this.step; for (var i = 0; i < this.aLi.length; i++) { this.aLi[i].className = i === tmpStep ? 'on' : null; if (this.aLi[i].className === "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'; } } };