基于jquery的图片幻灯展示源码

//图片幻灯展示 
$(function() { 
var imgPro = { 
imgWidth : 626, //图片宽度 
imgConLength : 0, //图片总长度 
index : 0, //导航锁定索引 
count : 0, //图片数量 
left : 0, //绝对定位left 
pre : -1, //上个图片索引 
curr : 0, //当前图片索引 
next : 1, //下个图片索引 
direction : 1, //自动播放方向 
interTime : 3000//间隔时间 
} 
addImgAlt(imgPro.curr); 
imgPro.count = $('#banner .list a img').length; 
imgPro.imgConLength = imgPro.imgWidth * imgPro.count; 
imgPro.left = parseInt($('#box .list ul').css("left")); 
//播放定时器 
var t = setInterval(imgPlay, imgPro.interTime); 
$('#box .arrowl img, #box .arrowr img,#banner .list a,#box .count li,#box p').hover(function() { 
clearInterval(t); 
}, function() { 
t = setInterval(imgPlay, imgPro.interTime); 
}); 
// 自动播放图片 
function imgPlay() { 
if ((imgPro.next != imgPro.count && imgPro.direction == 1) || (imgPro.pre == -1 && imgPro.direction == -1)) { 
imgPro.direction = 1; 
toNext(); 
} else { 
imgPro.direction = -1; 
toLast(); 
} 

} 

//点击左方向 
$('#box .arrowl img').click(function() { 
if (imgPro.curr != 0) { 
toLast(); 
} 
}); 
//点击右方向 
$('#box .arrowr img').click(function() { 
if (imgPro.next != imgPro.count) { 
toNext(); 
} 
}); 
//点击导航播放 
$('#box .count li').click(function() { 
imgPro.index = $('#box .count li').index(this); 
if (imgPro.curr != imgPro.index) { 
imgPro.left += (imgPro.curr - imgPro.index) * imgPro.imgWidth; 
addImgAlt(imgPro.index); 
play(); 
$('#box .count li').eq(imgPro.curr).removeClass('current').end().eq(imgPro.index).addClass('current'); 
imgPro.curr = imgPro.index; 
imgPro.pre = imgPro.index - 1; 
imgPro.next = imgPro.index + 1; 
} 
}); 
//播放 
function play() { 
$('#box .list ul').css({ 
'opacity' : '0.5' 
}).animate({ 
'left' : imgPro.left + "px", 
'opacity' : '1' 
}, 'slow'); 
} 

//添加图片说明信息 
function addImgAlt(index) { 
$("#box p").text($("#banner .list a img").eq(index).attr("alt")); 
} 

//上一张 
function toLast() { 
imgPro.left += imgPro.imgWidth; 
addImgAlt(imgPro.pre); 
play(); 
$('#box .count li').eq(imgPro.curr).removeClass('current').end().eq(imgPro.pre).addClass('current'); 
imgPro.pre--; 
imgPro.curr--; 
imgPro.next--; 
} 

//下一张 
function toNext() { 
imgPro.left -= imgPro.imgWidth; 
addImgAlt(imgPro.next); 
play(); 
$('#box .count li').eq(imgPro.curr).removeClass('current').end().eq(imgPro.next).addClass('current'); 
imgPro.pre++; 
imgPro.curr++; 
imgPro.next++; 
} 

});