如题.我想问一下,怎样做一个定时滚动图片的BANNER?BANNER图片一共有4张,每次只显示1张,每隔5秒换一张,如果到最后一张就回到第一张重新换图.<div id="banner">
<ul>
<li>第一张</li>
<li>第二张</li>
<li>第三张</li>
<li>第四张</li>
</ul>
</div>
我是这样想的:通过改变left来做的,不过就是不知道怎样写.用jQuery;
<ul>
<li>第一张</li>
<li>第二张</li>
<li>第三张</li>
<li>第四张</li>
</ul>
</div>
我是这样想的:通过改变left来做的,不过就是不知道怎样写.用jQuery;
求大神!
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style>
<!--
body, ul, li, p {
margin: 0;
padding: 0;
}
ul{
list-style-type:none;
}
body {
font-family:"Times New Roman", Times, serif;
}
#box {
position:relative;
width:492px;
height:172px;
margin:10px auto;
}
#box .imgList{
position:relative;
width:490px;
height:170px;
overflow:hidden;
}
#box .imgList li{
position:absolute;
top:0;
left:0;
width:490px;
height:170px;
}
#box .countNum{
position:absolute;
right:0;
bottom:5px;
}
#box .countNum li{
width:20px;
height:20px;
float:left;
color:#fff;
border-radius:20px;
background:#f90;
text-align:center;
margin-right:5px;
cursor:pointer;
opacity:0.7;
filter:alpha(opacity=70);
}
#box .countNum li.current{
background:#f60;
font-weight:bold;
opacity:1;
filter:alpha(opacity=70);
}
-->
</style>
<script>
<!--
function runImg(){}
runImg.prototype={
bigbox:null,//最外层容器
boxul:null,//子容器ul
imglist:null,//子容器img
numlist:null,//子容器countNum
prov:0,//上次显示项
index:0,//当前显示项
timer:null,//控制图片转变效果
play:null,//控制自动播放
imgurl:[],//存放图片
count:0,//存放的个数
$:function(obj)
{
if(typeof(obj)=="string")
{
if(obj.indexOf("#")>=0)
{
obj=obj.replace("#","");
if(document.getElementById(obj))
{
return document.getElementById(obj);
}
else
{
alert("没有容器"+obj);
return null;
}
}
else
{
return document.createElement(obj);
}
}
else
{
return obj;
}
},
//初始化
info:function(id)
{
this.count=this.count<=5?this.count:5;
this.bigbox=this.$(id);
for(var i=0;i<2;i++)
{
var ul=this.$("ul");
for(var j=1;j<=this.count;j++)
{
var li=this.$("li");
li.innerHTML=i==0?this.imgurl[j-1]:j;
ul.appendChild(li);
}
this.bigbox.appendChild(ul);
}
this.boxul=this.bigbox.getElementsByTagName("ul");
this.boxul[0].className="imgList";
this.boxul[1].className="countNum";
this.imglist=this.boxul[0].getElementsByTagName("li");
this.numlist=this.boxul[1].getElementsByTagName("li");
for(var j=0;j<this.imglist.length;j++)
{
this.alpha(j,0);
}
this.alpha(0,100);
this.numlist[0].className="current";
},
//封装程序入口
action:function(id)
{
this.autoplay();
this.mouseoverout(this.bigbox,this.numlist);
},
//图片切换效果
imgshow:function(num,numlist,imglist)
{
this.index=num;
var pralpha=100;
var inalpha=0;
for(var i=0;i<numlist.length;i++)
{
numlist[i].className="";
}
numlist[this.index].className="current";
clearInterval(this.timer);
for(var j=0;j<this.imglist.length;j++)
{
this.alpha(j,0);
}
this.alpha(this.prov,100);
this.alpha(this.index,0);
var $this=this;
//利用透明度来实现切换图片
this.timer=setInterval(function(){
inalpha+=2;
pralpha-=2;
if(inalpha>100){inalpha=100};//不能大于100
if(pralpha<0){pralpha=100};
//为兼容性赋样式
$this.alpha($this.prov,pralpha);
$this.alpha($this.index,inalpha);
if(inalpha==100&&pralpha==0){clearInterval($this.timer)};//当等于100的时候就切换完成了
},20)//经测试20是我认为最合适的值
},
//设置透明度
alpha:function(i,opacity){
this.imglist[i].style.opacity=opacity/100;
this.imglist[i].style.filter="alpha(opacity="+opacity+")";
},
//自动播放
autoplay:function(){
var $this=this;
this.play=setInterval(function(){
$this.prov=$this.index;
$this.index++;
if($this.index>$this.imglist.length-1){$this.index=0};
$this.imgshow($this.index,$this.numlist,$this.imglist);
},2000)
},
//处理鼠标事件
mouseoverout:function(box,numlist)
{
var $this=this;
box.onmouseover=function()
{
clearInterval($this.play);
}
box.onmouseout=function()
{
$this.autoplay($this.index);
}
for(var i=0;i<numlist.length;i++)
{
numlist[i].index=i;
numlist[i].onmouseover=function(){
$this.prov=$this.index;
$this.imgshow(this.index,$this.numlist,$this.imglist);
}
}
}
}
window.onload=function(){
var runimg=new runImg();
runimg.count=5;
runimg.imgurl=[
"<img src=\"http://i.mmcdn.cn/simba/img/T117eTXmXqXXXXXXXX.jpg\"/>",
"<img src=\"http://img03.taobaocdn.com/tps/i3/T1t8eTXbBtXXXXXXXX-490-170.png\"/>",
"<img src=\"http://i.mmcdn.cn/simba/img/T1OVOUXeNjXXXXXXXX.jpg\"/>",
"<img src=\"http://i.mmcdn.cn/simba/img/T1J.9TXc8lXXXXXXXX.jpg\"/>",
"<img src=\"http://img03.taobaocdn.com/tps/i3/T1ITuTXbRnXXXXXXXX-490-170.png\"/>"];
runimg.info("#box");
runimg.action("#box");
}
-->
</script>
</head><body>
<center><h1>1</h1><p>2</p></center>
<div id="box"></div>
</body>
</html>
对了,我忘记说了.我想用1.7.2版本的jQuery来写,不想用插件.
求大神!