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下面看下js轮播图的实现代码，具体代码如下所示：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
* {
padding: 0;
margin: 0;
list-style: none;
border: 0;
}
.all {
width: 500px;
height: 200px;
padding: 7px;
border: 1px solid #ccc;
margin: 100px auto;
position: relative;
}
.screen {
width: 500px;
height: 200px;
overflow: hidden;
position: relative;
}
.screen li {
width: 500px;
height: 200px;
overflow: hidden;
float: left;
}
.screen ul {
position: absolute;
left: 0;
top: 0px;
width: 3000px;
}
.all ol {
position: absolute;
right: 10px;
bottom: 10px;
line-height: 20px;
text-align: center;
}
.all ol li {
float: left;
width: 20px;
height: 20px;
background: #fff;
border: 1px solid #ccc;
margin-left: 10px;
cursor: pointer;
}
.all ol li.current {
background: yellow;
}
#arr {
display: none;
}
#arr span {
width: 40px;
height: 40px;
position: absolute;
left: 5px;
top: 50%;
margin-top: -20px;
background: #000;
cursor: pointer;
line-height: 40px;
text-align: center;
font-weight: bold;
font-family: '黑体';
font-size: 30px;
color: #fff;
opacity: 0.3;
border: 1px solid #fff;
}
#arr #right {
right: 5px;
left: auto;
}
</style>
</head>
<body>
<div class="all" id='box'>
<div class="screen">
<ul>
<li><img src="images/1.jpg" width="500" height="200"/></li>
<li><img src="images/2.jpg" width="500" height="200"/></li>
<li><img src="images/3.jpg" width="500" height="200"/></li>
<li><img src="images/4.jpg" width="500" height="200"/></li>
<li><img src="images/5.jpg" width="500" height="200"/></li>
</ul>
<ol>
</ol>
</div>
<div id="arr"><span id="left"><</span><span id="right">></span></div>
</div>
<script>
function $(element) {
return document.getElementById(element);
}
var box = $("box");
var screen = box.children[0];
var ul = screen.children[0];
var ulLis = ul.children;
var ol = screen.children[1];
var arr = $("arr");
var left = $("left");
var right = $("right");
//动态创建小图标
for (var i = 0; i < ulLis.length; i++) {
var li = document.createElement("li");
li.innerHTML = i + 1;
ol.appendChild(li);
}
//设置这些个小图标
var olLis = ol.children;
var imgWidth = screen.offsetWidth;
for (var j = 0; j < olLis.length; j++) {
olLis[j].index = j;
olLis[j].onmouseover = function () {
//排他思想
for (var i = 0; i < olLis.length; i++) {
olLis[i].className = "";
}
this.className = "current";
var target = -imgWidth * this.index;
cutton(ul, target, 20);
//为了让点击事件和小面的小图标能够一一对应，设置他们的索引值相同
pic = square = this.index;
}
}
//给小图标设置一个初始样式
ol.children[0].className = "current";
//给ul追加一张图
ul.appendChild(ul.children[0].cloneNode(true));
//设置箭头的显示与隐藏
box.onmouseover = function () {
arr.style.display = "block";
//鼠标放上去的时候，不再自动滚动
clearInterval(timer);
}
box.onmouseout = function () {
arr.style.display = "none";
//鼠标离开的时候，继续自动滚动
timer = setInterval(playNext, 1000);
}
//设置点击左右小箭头的事件且要求小图标要跟着变化
//1.设置点击右侧箭头
var pic = 0;//记录当前为第几项用
var square = 0;//记录小图标的索引值
/* right.onclick = function () {//存在的问题是当移动到最后一张的时候，无法跳转到第一张
pic++;
var target = -pic * imgWidth;
cutton(ul, target, 20);
}*/
//方法改进
/*right.onclick = function () {
//先对pic做一个判断，当pic的值为5的时候，实现一个跳转
if (pic == ulLis.length - 1) {
ul.style.left = 0;
pic = 0;
}
pic++;
var target = -pic * imgWidth;
cutton(ul, target, 20);
if (square == olLis.length - 1) {
square = -1;//下面会加一，就变成了0
}
square++;
//排他思想
for (var i = 0; i < olLis.length; i++) {
olLis[i].className = "";
}
olLis[square].className = "current";
}*/
//使用封装函数
right.onclick = function () {
playNext();
}
//2.设置点击左侧箭头
left.onclick = function () {//要判断一下当pic为零时的情况
if (pic == 0) {
ul.style.left = -imgWidth * (ulLis.length - 1) + "px";//要记得加单位
pic = ulLis.length - 1;//给pic重新赋一个值
}
pic--;
var target = -pic * imgWidth;
cutton(ul, target, 20);
//设置小图标样式
if (square == 0) {
square = olLis.length;
}
square--;
for (var i = 0; i < olLis.length; i++) {
olLis[i].className = "";
}
olLis[square].className = "current";
}
//设置自动滚动
//1.封装点击右侧小箭头事件
function playNext() {
//先对pic做一个判断，当pic的值为5的时候，实现一个跳转
if (pic == ulLis.length - 1) {
ul.style.left = 0;
pic = 0;
}
pic++;
var target = -pic * imgWidth;
cutton(ul, target, 20);
if (square == olLis.length - 1) {
square = -1;//下面会加一，就变成了0
}
square++;
//排他思想
for (var i = 0; i < olLis.length; i++) {
olLis[i].className = "";
}
olLis[square].className = "current";
}
//2.调用这个封装的函数，并且设置一个间歇性计时器
var timer = null;
timer = setInterval(playNext, 1000);
//封装函数
function cutton(obj, target, stp) {
clearInterval(obj.timer);
obj.timer = setInterval(function () {
var step = stp;
step = obj.offsetLeft > target ? -step : step;
if (Math.abs(obj.offsetLeft - target) >= Math.abs(step)) {
obj.style.left = obj.offsetLeft + step + "px";
} else {
obj.style.left = target + "px";
clearInterval(obj.timer);
}
}, 15)
}
</script>
</body>
</html>
</div>
补充：原生javascript实现banner图自动轮播切换
一般在做banner轮播图的时候都是用jquery，因为代码少，方便，不需要花费很长的时间去获取某个元素作为变量，然后再进行操作，只要一个$就搞定了。但是今天我用原生的javascript做了一下这个轮播效果，感觉还行，以下是部分js源代码，仅供参考！文章底部查看效果演示。
1、鼠标离开banner图，每隔2s切换一次；
2、鼠标滑过下方的小按钮，可以切换图片；
3、鼠标点击左右按钮，可以切换图片。
var oPic,oLi,anniu,aLi,aLength,num,timer,oG,_index,oSpan;
window.onload = function(){
oPic = document.getElementsByClassName("pic")[0];
oLi = oPic.getElementsByTagName("li");
anniu = document.getElementsByClassName("anniu")[0];
aLi = anniu.getElementsByTagName("li");
aLength = aLi.length;
num = 0;
oG = document.getElementsByClassName("g")[0];
oSpan = oG.getElementsByTagName("span");
oLeft = oSpan[0];
oRight = oSpan[1];
start();
oG.onmouseover = end;
oG.onmouseout = start;
for(var j=0; j<aLength; j++){
aLi[j].index = j;
aLi[j].onmouseover = change;
}
oRight.onclick = time;
oLeft.onclick = times;
}
//自动轮播开始或结束
function start(){
timer = setInterval(time,2000);
hide();
}
function end(){
clearInterval(timer);