//圖片幻燈展示
$(function() {
var imgPro = {
imgWidth : 626, //圖片寬度
imgConLength : 0, //圖片總長(zhǎng)度
index : 0, //導(dǎo)航鎖定索引
count : 0, //圖片數(shù)量
left : 0, //絕對(duì)定位left
pre : -1, //上個(gè)圖片索引
curr : 0, //當(dāng)前圖片索引
next : 1, //下個(gè)圖片索引
direction : 1, //自動(dòng)播放方向
interTime : 3000//間隔時(shí)間
}
addImgAlt(imgPro.curr);
imgPro.count = $('#banner .list a img').length;
imgPro.imgConLength = imgPro.imgWidth * imgPro.count;
imgPro.left = parseInt($('#box .list ul').css("left"));
//播放定時(shí)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);
});
// 自動(dòng)播放圖片
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();
}

}

//點(diǎn)擊左方向
$('#box .arrowl img').click(function() {
if (imgPro.curr != 0) {
toLast();
}
});
//點(diǎn)擊右方向
$('#box .arrowr img').click(function() {
if (imgPro.next != imgPro.count) {
toNext();
}
});
//點(diǎn)擊導(dǎo)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');
}

//添加圖片說(shuō)明信息
function addImgAlt(index) {
$("#box p").text($("#banner .list a img").eq(index).attr("alt"));
}

//上一張
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--;
}

//下一張
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++;
}

});