jquery实现图片轮播效果

html 部分

<div id="lunbo">
<ul id="pics">
<li style="display: inline;"><img src="http://pic.qiantucdn.com/58pic/14/60/54/32n58PICxE6_1024.jpg"></li>
<li><img src="http://pic.qiantucdn.com/58pic/19/09/94/5678b76f75315_1024.jpg"></li>
<li><img src="http://pic.qiantucdn.com/58pic/19/39/22/01D58PICFx7_1024.jpg"></li>
<li><img src="http://pic.qiantucdn.com/58pic/19/11/08/5679490f4892d_1024.jpg"></li>
<li><img src="http://pic.qiantucdn.com/58pic/18/44/26/5620690acb188_1024.jpg"></li>
</ul>

</div>

css部分

#lunbo{width: 600px;height: 300px;margin: 0 auto;overflow: hidden;}
#pics{width: 600px;height: 300px;cursor: pointer;position: relative;}
ul li{width: 600px;height: 300px;list-style: none;position: absolute;top: 0;left: 0;display: none;}
img{width: 600px;height: 300px;}

js部分

<script type="text/javascript" src="jquery-1.11.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){

var oLi = $("li");
var liWidth = oLi.eq(0).width();
var liHeight = oLi.eq(0).height();

//每隔3秒进行轮播
var timer = setInterval(change,3000);
//鼠标放置在图片上时停止轮播，移开时继续轮播
 $("div").mouseover ( function(){
clearInterval(timer);
})
$("div").mouseout (function(){
timer = setInterval(change,3000);
})

//轮播函数
var prevIndex = 0,nextIndex = 1;
function change(){
if (prevIndex == oLi.length-1 ) {//若当前图片是最后一张图片，下一张出现首张图片
nextIndex = 0;
}
var n = Math.floor(Math.random()*3);
if (n == 0) {
fade(prevIndex,nextIndex);
}
else if (n== 2) {
slide(prevIndex,nextIndex);
}
else{
grap(prevIndex,nextIndex);
}
prevIndex = nextIndex;
nextIndex ++;
}

//淡入淡出效果,
function fade(prevIndex,nextIndex){
//传入当前显示图片以及下一张图片的索引
oLi.eq(prevIndex).fadeOut(1000);
oLi.eq(nextIndex).fadeIn(1000);

}
//向左右滑动效果
function slide(prevIndex,nextIndex){
var rand = Math.floor(Math.random()*2);

oLi.eq(nextIndex).show();
oLi.eq(nextIndex).css("z-index","-1");
if (rand) {
//向左滑动
oLi.eq(prevIndex).animate({left: -liWidth},1000,fun);
}
else{
oLi.eq(prevIndex).animate({left: liWidth},1000,fun);

}
function fun(){
oLi.eq(prevIndex).css({"left":"0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
}
}
//收缩效果
function grap(prevIndex,nextIndex){
var rand = Math.floor(Math.random()*4);
oLi.eq(nextIndex).show();
oLi.eq(nextIndex).css("z-index","-1");
switch (rand){
case 0://向左上角滑动
oLi.eq(prevIndex).animate({left: -liWidth,top: -liHeight},1000,function(){
oLi.eq(prevIndex).css({"left":"0","top": "0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
});break;
case 1://向右上角滑动
oLi.eq(prevIndex).animate({left: liWidth,top: -liHeight},1000,function(){
oLi.eq(prevIndex).css({"left":'0',"top":"0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
});break;
case 2://向右下角滑动
oLi.eq(prevIndex).animate({left: liWidth,top: liHeight},1000,function(){
oLi.eq(prevIndex).css({"left":'0',"top":"0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
});break;
case 3://向左下角滑动
oLi.eq(prevIndex).animate({left: -liWidth,top: liHeight},1000,function(){
oLi.eq(prevIndex).css({"left":'0',"top":"0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
});break;
default:break;
}
}

});

</script>