简单轮播js实现
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>rotate</title>
<link rel="stylesheet" href="css/index.css" />
<style type="text/css">
*{
margin: 0;
padding: 0;
list-style: none;
}
#rotateImg{
width: 400px;
height: 220px;
margin:100px auto;
position: relative;
font:12px helvetica;
overflow: hidden;
}
img{
width: 400px;
height: 220px;
}
#rotateImg>ul{
position: absolute;
bottom:15px;
left:50%;
margin-left:-60px;
}
#rotateImg>ul>li{
float: left;
/*list-style: none;*/
cursor: pointer;
width: 16px;
height: 16px;
margin-right:10px;
text-align: center;
line-height: 16px;
border-radius: 8px;
background: #fff;
}
#rotateImg>ul>li.light{
background:red;
color:#fff;
}
#imgcontainer{
width: 100%;
}
#imgcontainer>ul{
width: 1000%;
height: 220px;
list-style: none;
position: absolute;
}
#imgcontainer>ul li{
float:left;
}
.arrows{
position: absolute;
width: 100%;
height: 40px;
top:50%;
margin-top:-20px;
display: none;
color: red;
}
.arrows .prev, .arrows .next{
height: 40px;
width: 40px;
line-height: 40px;
text-align: center;
font:600 30px/40px "simsun";
background:rgba(0,0,0,0.2);
cursor: pointer;
}
.arrows .prev{
float:left;
}
.arrows .next{
float:right;
}
</style>
</head>
<body>
<div id="rotateImg">
<div id="imgcontainer">
<ul>
<li><a href="#"><img src="img/ppt/Familia--Stark.gif" alt="" /></a></li>
<li><a href="#"><img src="img/ppt/game-of-thrones-deaths-09.jpg" alt="" /></a></li>
<li><a href="#"><img src="img/ppt/margaery-and-sansa.jpg" alt="" /></a></li>
<li><a href="#"><img src="img/ppt/Robb-Stark-Game-Of-Thrones.jpg" alt="" /></a></li>
<li><a href="#"><img src="img/ppt/starks.jpg" alt="" /></a></li>
<li><a href="#"><img src="img/ppt/game-of-thrones-has-been-an-integral-part.jpg" alt="" /></a></li>
</ul>
</div>
<ul>
</ul>
<div class="arrows">
<div class="prev"><</div>
<div class="next">></div>
</div>
</div>
<script type="text/javascript">
window.onload=function(){
move("rotateImg");
}
function animation(obj,target){
var speed;
clearInterval(obj.timer);
obj.timer=setInterval(function(){
speed = (target - obj.offsetLeft)/10;
speed = (speed>0?Math.ceil(speed):Math.floor(speed));
obj.style.left = obj.offsetLeft+speed+"px";
if(obj.offsetLeft==target){
clearInterval(obj.timer);
}
}, 20)
}
function move(id){
var rotateImg = document.getElementById(id);
var imgUl = rotateImg.children[0].children[0];
var imgList=imgUl.children;
var dotUl = rotateImg.children[1];
var arrows = rotateImg.children[2];
var prev = arrows.children[0];
var next = arrows.children[1];
var width = rotateImg.offsetWidth;
var num = 0;
//clone first image
var newLiFirstImgClone = imgUl.children[0].cloneNode(true);
imgUl.appendChild(newLiFirstImgClone);
//1、create dot according to number of images and append it
for(var i=1;i<imgList.length;i++){
var newDot = document.createElement("li");
newDot.innerHTML = i;
dotUl.appendChild(newDot);
}
var dotLiArray = dotUl.children;
//light first dot
light(num);
//2 click dot,transform image and light dot
for(var k =0;k<dotLiArray.length;k++){
dotLiArray[k].index = k;
dotLiArray[k].onclick=function(){
num = this.index;
light(num);
animation(imgUl,-num*width);
}
}
function light(index){
for(var j=0;j<dotLiArray.length;j++){
dotLiArray[j].className="";
}
dotLiArray[index].className = "light";
}
// 3、next
next.onclick=autoplay;
function autoplay(){
num++;
if(num==imgUl.children.length-1){
light(0);
//if img comes to the clone img,light the first dot
}else if(num==imgUl.children.length){
//if img is in the end ,set position to second img in a flash
imgUl.style.left=0;
num = 1;
light(num);
}else{
light(num);
}
animation(imgUl,-num*width);
}
//4、prevent
prev.onclick=function(){
num--;
if(num==-1){
//if image comes to the end then transform it before the clone image
imgUl.style.left=-width*(imgUl.children.length-1)+"px";
//change img position suddenly
num = imgUl.children.length-2;
}
light(num)
animation(imgUl,-num*width);
}
//5 when mouse move over elements,stop rotate and show arrow
rotateImg.onmouseover=function(){
clearInterval(rotateImg.timer);
arrows.style.display="block";
}
//6 when mouse out star rotate and hide arrow
rotateImg.onmouseout=function(){
clearInterval(rotateImg.timer);
arrows.style.display="none";
rotateImg.timer = setInterval(function(){
autoplay();
}, 1000)
}
//clearInterval and set original state as autoplay
clearInterval(rotateImg.timer);
rotateImg.timer = setInterval(function(){
autoplay();
}, 1000)
}
</script>
</body>
</html>
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