自动播放时鼠标移进移出没效果，小圆点每次移动到第二个。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>焦点轮播图</title>
<style type="text/css">
*{ margin: 0; padding: 0; text-decoration: none;}
body { padding: 20px;}
#container { width: 600px; height: 400px; border: 3px solid #333; overflow: hidden; position: relative;}
#list { width: 4200px; height: 400px; position: absolute; z-index: 1;}
#list img { float: left;}
#buttons { position: absolute; height: 10px; width: 100px; z-index: 2; bottom: 20px; left: 250px;}
#buttons span { cursor: pointer; float: left; border: 1px solid #fff; width: 10px; height: 10px; border-radius: 50%; background: #333; margin-right: 5px;}
#buttons .on { background: orangered;}
.arrow { cursor: pointer; display: none; line-height: 39px; text-align: center; font-size: 36px; font-weight: bold; width: 40px; height: 40px; position: absolute; z-index: 2; top: 180px; background-color: RGBA(0,0,0,.3); color: #fff;}
.arrow:hover { background-color: RGBA(0,0,0,.7);}
#container:hover .arrow { display: block;}
#prev { left: 20px;}
#next { right: 20px;}
</style>
</head>
<body>
<div id="container">
<div id="list" style="left: -600px;">
<img src="__STATIC__/index/images/pc/5.jpg" alt="1"/>
<img src="__STATIC__/index/images/pc/1.jpg" alt="1"/>
<img src="__STATIC__/index/images/pc/2.jpg" alt="2"/>
<img src="__STATIC__/index/images/pc/3.jpg" alt="3"/>
<img src="__STATIC__/index/images/pc/4.jpg" alt="4"/>
<img src="__STATIC__/index/images/pc/5.jpg" alt="5"/>
<img src="__STATIC__/index/images/pc/1.jpg" alt="5"/>
</div>
<div id="buttons">
<span index="1" class="on"></span>
<span index="2"></span>
<span index="3"></span>
<span index="4"></span>
<span index="5"></span>
</div>
<a href="javascript:;" id="prev" class="arrow"><</a>
<a href="javascript:;" id="next" class="arrow">></a>
</div>
</body>
<script src="__STATIC__/index/js/jquery.1.10.2.js"></script>
<script type="text/javascript">
//数据初始化加载
window.onload = function () {
var container = document.getElementById('container')//获取容器
var list = document.getElementById('list');
var buttons = document.getElementById('buttons').getElementsByTagName('span');
var prev = document.getElementById('prev');//左箭头容器
var next = document.getElementById('next');//右箭头容器
var index = 1;
var animated = false; //动画是否在运行变量
var timer ; //定时器变量
//小圆点切换
function showButton() {
for(i=0; i<buttons.length; i++){
if(buttons[i].className == 'on'){
buttons[i].className = '';
break;
}
}
buttons[index - 1].className = 'on';
}
//点击箭头向左切换图片
function animate(offset) {
animated = true; //动画在运行时为true；
var newLeft = parseInt(list.style.left) + offset;
var time = 600;//位移总时间
var interval = 10 ; //位移间隔10毫秒
var speed = offset/(time/interval); //每次的位移量
//图片位移动画效果
function go(){
if( (speed < 0 && parseInt(list.style.left)> newLeft) ||(speed > 0 && parseInt(list.style.left)< newLeft) ){
list.style.left = parseInt(list.style.left) + speed + 'px';//把字符串转成数字
setTimeout(go,interval);//setTimeout:设置定时器（执行一次）
}else{
animated = false; //动画在运行时为false；
list.style.left = newLeft + 'px';
if(newLeft > -600){
list.style.left = -3000 + 'px';
}
if(newLeft < -3000){
list.style.left = -600 + 'px';
}
}
}
go();
}
//自动播放(原理：每隔1秒执行点击右箭头操作)
function play(){
timer = setInterval(function () { //setInterval:设置定时器（执行多次）
next.onclick();
},3000);
}
//鼠标移上去停止动画
function stop(){
clearInterval(timer);//清除定时器
}
//点击箭头向右切换图片
next.onclick = function () {
if(index == 5){
index = 1;
}else{
index += 1;
}
showButton();
if(!animated){
animate(-600) //把字符串转成数字
}
};
prev.onclick = function () {
if(index == 1){
index = 5;
}else{
index -= 1;
}
showButton();
if(!animated){
animate(600) //把字符串转成数字
}
};
//点击某个小圆点 切换到当前原点对应的图片
for (i=0; i<buttons.length; i++){
buttons[i].onclick = function () {
if(this.className == 'on'){
return;
}
var myIndex = this.getAttribute('index');//获取span标签的index值 getAttribute：获取某个二级自定义属性的值
var offset = -600 * (myIndex - index);
if(!animated){
animate(600) //把字符串转成数字
}
index = myIndex;
showButton();
};
}
container.onmouseover = stop();//鼠标移进停止位移动画
container.onmouseout = play();//鼠标移出恢复位移动画
play();//初始化 自动播放状态
};
</script>
</html>自动播放时鼠标移进移出没效果 ：
container.onmouseover = stop; container.onmouseout = play;