// JavaScript Document
function i_slide(obj, opt) {
    var option = {
        speed: "5000",//间隔运动时间
        a_speed: "500",//运动时间
        conuntW: "655",//整体内容宽度
        countH: "530",//整体内容高度
        w1: "280",//大图宽度
        h1: "160",//大图高度
        w2: "190",//小图宽度
        h2: "500"//小图高度  
    }

    var ul = obj.find("ul.slide_img");
    var btn = obj.find(".i_btn");
    var con = ul.find(".on");
    var li = ul.children("li");
    var lion = ul.children("li.on");
    var length = li.length;
    var half = parseInt(length / 2);
    var number;
    var T;
    var start;
    //参数初始化,看是否有新的参数传入，传入则更新初始化设置  
    var opts = $.extend(option, opt || {});
    var speed = opts.speed;
    var a_speed = opts.a_speed;
    var conuntW = opts.conuntW;//整体内容宽度
    var countH = opts.countH;//整体内容高度
    var w1 = opts.w1;//大图宽度
    var h1 = opts.h1;//大图高度
    //大图left
    var left1 = (opts.conuntW - opts.w1) / 2;
    //大图top
    var top1 = (opts.countH - opts.h1) / 2;
    var left2 = opts.conuntW - opts.w2;//小图left
    //小图top
    var top2 = (opts.countH - opts.h2) / 2;
    var w2 = opts.w2;//小图宽度
    var h2 = opts.h2;//小图高度

    if (length % 2 == 0) {
        half = half - 1;
    }

    //默认轮播
    clearInterval(T)
    number = parseInt(now_show(li))
    pos_dex(number)
    T = setInterval(function () {
        ss();
        pos_dex(number)
    }, speed)
    //重新定位

    function pos_dex(N) {
        var next;
        var z = li.length;
        //	alert(z);
        li.eq(N).attr("class", "on");
        li.eq(N).find(".bg").hide();
        li.eq(N).siblings("li").find(".bg").show();
        for (i = 1; i <= half; i++) {
            //right
            next = N + i;
            z = z - i
            if (next == length) {
                next = 0;
            }
            li.eq(next).css("z-index", z);
            li.eq(next).attr("class", "right");
            li.eq(next).animate({ "left": left2, "width": w2, "height": h2, "top": "15px" }, a_speed);
            // li.eq(next).css("z-index",z);
            //left 
            var pre = N - i;
            if (pre == -1) {
                pre = length - 1;
            }
            li.eq(pre).attr("class", "left");
            li.eq(pre).css("z-index", z);
            // li.eq(pre).css("z-index",z);
            li.eq(pre).animate({ "left": "0px", "width": w2, "height": h2, "top": "15px" }, a_speed);
        }
        //mid
        if (length % 2 == 0) {
            li.eq(next + 1).attr("class", "mid");
            li.eq(next + 1).css("z-index", z - 2);
            li.eq(next + 1).animate({ "left": left2, "width": w2, "height": h2, "top": "15px" }, a_speed);
        }
        //li.eq(N).css("z-index",length);
        li.eq(N).css("z-index", parseInt(length) + 3);
        li.eq(N).animate({ "left": left1, "width": w1, "height": h1, "top": 0 }, a_speed);
    }
    //当前显示的是第几个图片
    function now_show(chi) {
        var now = 0;
        for (i = 0; i < chi.length; i++) {
            var li = chi[i];
            if ($(li).hasClass("on")) {
                now = i;
            }
        }
        return now;
    }
    //点击前后按钮切换
    var arr = [];
    var flg;
    btn.unbind('click').click(function () {
        clearInterval(T);
        number = parseInt(now_show(li));
        var tip = $(this).attr("tip");
        if (tip == 0) {
            //向前
            if (number == 0) {
                number = length - 1;
            } else {
                number = number - 1;
            }
        } else {
            //向后
            if (number == length - 1) {
                number = 0;
            } else {
                number = number + 1;
            }
        }
        if (!lion.is(":animated")) {
            pos_dex(number);
            T = setInterval(function () {
                ss();
                pos_dex(number)
            }, speed)
        }


    })
    //鼠标点击
    ul.on("click", "li", function () {
        clearInterval(T);
        number = parseInt(now_show(li))
        setTimeout(function () {
            T = setInterval(function () {
                ss();
                pos_dex(number)
            }, speed)
        }, 300);
    });

    function ss() {
        number = number + 1;
        if (number == length) {
            number = 0;
        }
    }

}