第一次做轮播图切换效果
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{margin:0;
padding:0;
list-style:none;}
.wrap{height:170px;
width:490px;
margin:60px auto;
overflow: hidden;
position: relative;
margin:100px auto;}
.wrap ul{position:absolute;}
.wrap ul li{height:170px;}
.wrap ol{position:absolute;
right:5px;
bottom:10px;}
.wrap ol li{height:20px; width: 20px;
background:#ccc;
border:solid 1px #666;
margin-left:5px;
color:#000;
float:left;
line-height:center;
text-align:center;
cursor:pointer;}
.wrap ol .on{background:#E97305;
color:#fff;}
</style>
<script type="text/javascript">
window.onload=function(){
var wrap=document.getElementById('wrap'),
pic=document.getElementById('pic').getElementsByTagName('li');
list=document.getElementById('list').getElementsByTagName('li');
index=0,
timer=null;
//定时器
timer=setInterval(function(){
index++;
if(index>=list.length){
index=0;
}
autoplay(index);
},2000)
//鼠标经过容器的时候，清除定时器
wrap.onmouseover=function(){
clearInterval(timer);
timer=unll;
}
//鼠标离开容器的时候，执行定时器
wrap.onmouseout=function(){
timer=setInterval(function(){
index++;
if(index>=list.length){
index=0;
}
autoplay(index);
},2000)
}
//鼠标点击时候，显示当前点击的内容
for(i=0;i<list.length;i++){
list[i].num=i;
list[i].onclick=function(){
autoplay(this.num);
index=[this.num];
}}
//自动播放函数
function autoplay(curindex){
for(j=0;j<list.length;j++){
list[j].className='';
pic[j].style.display='none';
}
list[curindex].className='on';
pic[curindex].style.display='block';
}
}
</script>
</head>
<body>
<div class="wrap" id='wrap'>
<ul id="pic">
<li style="display:block"><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://img1.sycdn.imooc.com//54111cd9000174cd04900170.jpg" alt=""></li>
<li style="display:none"><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://img1.sycdn.imooc.com//54111dac000118af04900170.jpg" alt=""></li>
<li style="display:none"><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://img1.sycdn.imooc.com//54111d9c0001998204900170.jpg" alt=""></li>
<li style="display:none"><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://img1.sycdn.imooc.com//54111d8a0001f41704900170.jpg" alt=""></li>
<li style="display:none"><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://img1.sycdn.imooc.com//54111d7d00018ba604900170.jpg" alt=""></li>
</ul>
<ol id="list">
<li class="on">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ol>
</div>
</body>
</html>
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