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                        /焦点图轮播特效

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qq_特_3

2017-12-25

源自：焦点图轮播特效 2-1

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qq_特_3 提问者
2017-12-25

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>轮播图</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
text-decoration: none;
}

body {
padding: 20px;
}

#container {
position: relative;
width: 600px;
height: 400px;
border: 3px solid #333;
overflow: hidden;
}

#list {
position: absolute;
z-index: 1;
width: 4200px;
height: 400px;
}

#list img {
float: left;
width: 600px;
height: 400px;
}
#buttons {
position: absolute;
left: 250px;
bottom: 20px;
z-index: 2;
height: 10px;
width: 100px;
}

#buttons span {
float: left;
margin-right: 5px;
width: 10px;
height: 10px;
border: 1px solid #fff;
border-radius: 50%;
background: #333;
cursor: pointer;
}

#buttons .on {
background: orangered;
}

.arrow {
position: absolute;
top: 180px;
z-index: 2;
display: none;
width: 40px;
height: 40px;
font-size: 36px;
font-weight: bold;
line-height: 39px;
text-align: center;
color: #fff;
background-color: RGBA(0, 0, 0, .3);
cursor: pointer;
}

.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="img/05.jpg" alt="1">
<img src="img/01.jpg" alt="1">
<img src="img/02.jpg" alt="2">
<img src="img/03.jpg" alt="3">
<img src="img/04.jpg" alt="4">
<img src="img/05.jpg" alt="5">
<img src="img/01.jpg" alt="5">
</div>
<div id="buttons">
<span index="1"></span>
<span index="2"></span>
<span index="3"></span>
<span index="4"></span>
<span index="5"></span>
</div>
<a href="javascript:;" id="prev"><</a>
<a href="javascript:;" id="next">></a>
</div>
<script>
window.onload=function (){
var container =document.getElementById('container');
var list=document.getElementById('list');
var buttons=document.getElementById('buttons').getElementsByTagName('span');//获取5个按钮
var prev=document.getElementById('prev');//上一个
var next=document.getElementById('next');//下一个
var index=1;
var timer;
/*点亮小圆点*/
function showButton(){

for(var i=0;i<buttons.length;i++){
if(buttons[i].className=='on'){
buttons[i].className='';
break;
}
}
buttons[index-1].className='on';
}

/*箭头点击事件**/
function animate(offset){//封装按钮左右点击，传参offset
var newLeft=parseInt(list.style.left)+offset;
var time=300;//位移总时间
var interval=10;//位移间隔
var speed=offset/(time/interval);//每次位移量

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';

/*定时器*/
setTimeout(go,interval);
}
else{

list.style.left=newLeft+'px';
/* 判断是否滚动到附属图上，滚动到附属图上归位*/
if(newLeft> -600){
list.style.left = -3000 + 'px';
}
if(newLeft< -3000){
list.style.left = -600 + 'px';
}
}
}

go();

}

function play(){

timer=setInterval(function (){
next.onclick();
},3000);
}
function stop(){
clearInterval(timer);
}
next.onclick=function (){
if(index==5){
index=1;
}
else{
index +=1;
}

showButton();
animate(-600);//点击右箭头-600
}
prev.onclick=function (){
if(index==1){
index=5;
}
else{
index -= 1;
}

showButton();
animate(-600);//点击左箭头600
}

for(var i=0;i<buttons.length;i++){
//原始值
buttons[i].onclick=function (){
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;

}
</script>
</body>
</html>