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my_上下轮播.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body,div,ul,li{
margin:0;
padding:0;
list-style: none;
border: 0;
}
body{
background: #000;
}
#box{
width: 502px;
height: 202px;
margin:10px auto;
border: 8px solid #002232;
position: relative;
overflow: hidden;
}
#box .list-image{
/*border: 1px solid purple;*/
width: 500px;
height: 200px;
position: absolute;
}
#box .list-image li{
border: 1px solid purple;
width: 500px;
height: 200px;
}
#box .list-number{
z-index: 999;
position: absolute;
right: 0;
bottom: 5px;
}
#box .list-number li{
color: #fff;
float: left;
width: 20px;
height: 20px;
background: #f60;
border-radius: 20px;
font:12px/20px Arial;
/*这里有个要点*/
margin-right: 10px;
cursor: pointer;
text-align: center;
opacity: 0.7;
filter: alpha(opacity=70);
}
#box .list-number li.current{
opacity: 1;
filter: alpha(opacity=100);
}
</style>
</head>
<body>
<div id="box">
<ul class="list-image">
<li><img src="../image/landscape_map/047.jpg" width="500px" height="200px"></li>
<li><img src="../image/landscape_map/041.jpg" width="500px" height="200px"></li>
<li><img src="../image/landscape_map/042.jpg" width="500px" height="200px"></li>
<li><img src="../image/landscape_map/043.jpg" width="500px" height="200px"></li>
<li><img src="../image/landscape_map/037.jpg" width="500px" height="200px"></li>
</ul>
</div>
</body>
<script>
var oBox=document.getElementById("box");
var oUl=oBox.getElementsByTagName("ul");
var oImage=oUl[0].getElementsByTagName("li");
//创建数组元素
var tmp=[];
for(var i=0;i<oImage.length;i++){
tmp.push("<li>"+(i+1)+"</li>");
}
//现在tmp中保存着五个<li>
var oCount=document.createElement("ul");
oCount.className="list-number";
oCount.innerHTML=tmp.join('');
oBox.appendChild(oCount);
var index=0;
oNumber=oCount.getElementsByTagName("li");
for(var i=0;i<oNumber.length;i++){
oNumber[i].index=i;
oNumber[i].onmouseover=function(){
show(this.index);
}
}
function show(x){
for(var i=0;i<oNumber.length;i++)
{
oNumber[i].className="";
}
oNumber[x].className="current";
Move(x);
}
var timer=null;
function Move(x){
clearInterval(timer);
//赋值的时候要加上"px"哦
target=-x*202;
timer=setInterval(function(){
var speed=(-x*202-oUl[0].offsetTop)/10;
//因为是当前值，所有这个speed可正可负，根据我们所处图片的位置和要切换的目的地不同而定
speed=speed>0?Math.ceil(speed):Math.floor(speed);
oUl[0].offsetTop==target?clearInterval(timer):oUl[0].style.top=oUl[0].offsetTop+speed+"px";
},30)
index=x;//为了bug：若是我们先按了3，再来开进行自动轮播，它是从上一次index记录的开始自动。
}
var autotimer=null;
oBox.onmouseout=function(){
auto();
}
oBox.onmouseover=function(){
clearInterval(autotimer);
}
function auto(){
autotimer=setInterval(function(){
if(index<oImage.length-1){
index++;
}else{
index=0;
}
show(index);
},2000)
}
auto();
</script>
</html>