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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>
<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="img/banner1.jpg" alt=""/></div>
<div><img src="img/banner2.jpg" alt=""/></div>
<div><img src="img/banner3.jpg" alt=""/></div>
<div><img src="img/banner4.jpg" alt=""/></div>
<div><img src="img/banner5.jpg" alt=""/></div>
<div><img src="img/banner6.jpg" alt=""/></div>
<div><img src="img/banner7.jpg" alt=""/></div>
<!--以上是可增减区域-->
</div>
</div>
<script src="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 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\(opacity[=:](\d+)\)$/i;
return reg.test(val) ? reg.exec(val)[1] / 100 : 1;
}
val = curEle.currentStyle[attr];
}
reg = /^[+-]?((\d|([1-9]\d+))(\.\d+)?)(px|pt|rem|em)$/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';
}
}
};
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