效果图如下：
哇咔咔，好low，并没有什么亮点～
两份代码思路不同，但是感觉都差不多吧：
代码一：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>焦点轮播图Demo</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
text-decoration: none;
}
body {
padding: 20px;
}
#container {
width: 600px;
height: 400px;
position: relative;
overflow: hidden;
border: 3px solid #333;
}
#list {
width: 4200px;
height: 400px;
position: absolute;
z-index: 1;
left: -600px;
}
#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;
-webkit-border-radius: 50%;
-moz-border-radius: 50%;
border-radius: 50%;
background-color: #333;
margin-right: 5px;
}
#buttons .on {
background: orangered;
}
.arrow {
cursor: pointer;
text-align: center;
position: absolute;
z-index: 2;
font-size: 36px;
width: 40px;
height: 40px;
top: 180px;
background-color: RGBA(0, 0, 0, .3);
color: #fff;
line-height: 45px;
display: none;
}
.arrow:hover {
background-color: RGBA(0, 0, 0, .7);
}
#container:hover .arrow {
display: block;
}
#prev {
left: 20px;
}
#next {
right: 20px;
}
</style>
<script type="text/javascript">
window.onload = function () {
var container = document.getElementById('container');
var list = document.getElementById('list');
var buttons = document.getElementById('buttons').getElementsByTagName('span');
var prev = document.getElementById('prev');
var next = document.getElementById('next');
var animateComplete = true;//动画是否切换完成
var timer;//定时器
function setButtonClass(offset) {
var index = Math.abs(offset / 600);
for (var i = 0; i < buttons.length; i++) {
if (buttons[i].className) {
buttons[i].removeAttribute('class');
break;
}
}
buttons[index - 1].setAttribute('class', 'on');
}
function animated(offset) {
animateComplete = false;
var newLeft = parseInt(list.style.left) + offset;
var time = 300;//位移总时间
var interval = 10;//位移的间隔时间
var speed = offset/(time/interval);//每次位移走的距离
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';
setTimeout(go,interval);
}else{
list.style.left = newLeft + 'px';
if (newLeft > -600) {
list.style.left = -3000 + 'px';
}
if (newLeft < -3000) {
list.style.left = -600 + 'px';
}
setButtonClass(parseInt(list.style.left));
animateComplete = true;
}
}
go();
}
function autoPlay(){
timer = setInterval(function(){
next.onclick();
},2000);
}
function stopAutoPlay(){
clearInterval(timer);
}
prev.onclick = function () {
if(animateComplete){
animated(600);
}
};
next.onclick = function () {
if(animateComplete){
animated(-600);
}
};
//按钮切换
for (var i = 0, length = buttons.length; i < length; i++) {
buttons[i].onclick = function () {
if (this.className === 'on') {
return;
}
if(animateComplete){
var index = this.getAttribute('index');
var newLeft = index * (-600);
if(parseInt(list.style.left) === -3000 && newLeft === -600){
animated(-600);
}else if(parseInt(list.style.left) === -600 && newLeft === -3000){
animated(600);
}else{
animated(newLeft-parseInt(list.style.left));
}
}
}
}
container.onmouseover = stopAutoPlay;
container.onmouseout = autoPlay;
autoPlay();
}
</script>
</head>
<body>
<div id="container">
<div id="list" style="left: -600px">
<img src="img/5.jpg" alt="5">
<img src="img/1.jpg" alt="1">
<img src="img/2.jpg" alt="2">
<img src="img/3.jpg" alt="3">
<img src="img/4.jpg" alt="4">
<img src="img/5.jpg" alt="5">
<img src="img/1.jpg" alt="1">
</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>
</html>代码二：
<!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>
<script type="text/javascript">
window.onload = function () {
var container = document.getElementById('container');
var list = document.getElementById('list');
var buttons = document.getElementById('buttons').getElementsByTagName('span');
var prev = document.getElementById('prev');
var next = document.getElementById('next');
var index = 1;
var len = 5;
var animated = false;
var interval = 3000;
var timer;
function animate(offset) {
if (offset == 0) {
return;
}
animated = true;
var time = 300;
var inteval = 10;
var speed = offset / (time / inteval);
var left = parseInt(list.style.left) + offset;
var go = function () {
if ((speed > 0 && parseInt(list.style.left) < left) || (speed < 0 && parseInt(list.style.left) > left)) {
list.style.left = parseInt(list.style.left) + speed + 'px';
setTimeout(go, inteval);
}
else {
list.style.left = left + 'px';
if (left > -200) {
list.style.left = -600 * len + 'px';
}
if (left < (-600 * len)) {
list.style.left = '-600px';
}
animated = false;
}
}
go();
}
function showButton() {
for (var i = 0; i < buttons.length; i++) {
if (buttons[i].className == 'on') {
buttons[i].className = '';
break;
}
}
buttons[index - 1].className = 'on';
}
function play() {
timer = setTimeout(function () {
next.onclick();
play();
}, interval);
}
function stop() {
clearTimeout(timer);
}
next.onclick = function () {
if (animated) {
return;
}
if (index == 5) {
index = 1;
}
else {
index += 1;
}
animate(-600);
showButton();
}
prev.onclick = function () {
if (animated) {
return;
}
if (index == 1) {
index = 5;
}
else {
index -= 1;
}
animate(600);
showButton();
}
for (var i = 0; i < buttons.length; i++) {
buttons[i].onclick = function () {
if (animated) {
return;
}
if (this.className == 'on') {
return;
}
var myIndex = parseInt(this.getAttribute('index'));
var offset = -600 * (myIndex - index);
animate(offset);
index = myIndex;
showButton();
}
}
container.onmouseover = stop;
container.onmouseout = play;
play();
}
</script>
</head>
<body>
<div id="container">
<div id="list" style="left: -600px;">
<img src="img/5.jpg" alt="1"/>
<img src="img/1.jpg" alt="1"/>
<img src="img/2.jpg" alt="2"/>
<img src="img/3.jpg" alt="3"/>
<img src="img/4.jpg" alt="4"/>
<img src="img/5.jpg" alt="5"/>
<img src="img/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>
</html>
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