$(function () {
    var win_width = 0;
    var win_height = 0;
    var bannerInd = 0;
    var bannerInv = null;
    var newsInd = 0;
    var newsInv = null;

    init();
    main();
    
    $(".nav li").mouseover(function () {
        $(this).find(".subNav").stop(false, false).slideDown(300);
    }).mouseleave(function () {
        $(this).find(".subNav").stop(false, false).slideUp(300);
    });

    function init() {
        win_width = $(window).width();
        win_height = $(window).height();

        setImgMax($(".bannerBox img"), 1485, 750);

    }

    function main() {
        createBtns();
        changeBanner();
        createNewsBtns();
        changeNews();

        $(".weixin").mouseover(function () {
            $(this).find(".erweima").stop(false, false).animate({ bottom: 20, opacity: "show" });
        }).mouseleave(function () {
            $(this).find(".erweima").stop(false, false).animate({ bottom: 10, opacity: "hide" });
        });



    }

    function autoChangeBanner() {
        clearTimeout(bannerInv);
        bannerInv = setTimeout(function () {
            if (bannerInd >= $(".bannerBox img").size() - 1) {
                bannerInd = 0;
            } else {
                bannerInd++;
            }
            changeBanner();
        }, 5000);
    }

    function autoChangeNews() {
        clearTimeout(newsInv);
        newsInv = setTimeout(function () {
            if (newsInd >= $(".newsBox li").size() - 1) {
                newsInd = 0;
            } else {
                newsInd++;
            }
            changeNews();
        }, 4000);

    }

    function changeBanner() {
        clearTimeout(bannerInv);
        $(".bannerBox img").stop(false, false).fadeOut()
		.eq(bannerInd).stop(false, false).fadeIn();
        $(".bannerText img").stop(false, false).animate({ marginBottom: 80, opacity: "hide" }, 600)
		.eq(bannerInd).stop(false, false).animate({ marginBottom: 0, opacity: "show" }, 600);
        $(".btns span").removeClass("cur").eq(bannerInd).addClass("cur");
        autoChangeBanner();
    }

    function createBtns() {
        var str = '';
        for (var i = 0; i < $(".bannerBox img").size() ; i++) {
            str += '<span></span>';
        }

        $(".btns").html(str).find("span").mouseover(function () {
            if ($(this).hasClass("cur")) {
                return;
            }
            bannerInd = $(this).index();
            changeBanner();
        }).eq(0).addClass("cur");

    }

    function changeNews() {
        clearTimeout(newsInv);
        var aLi = $(".newsBox li");
        aLi.stop(false, false).animate({ left: -80, opacity: "hide" });
        aLi.eq(newsInd).stop(false, false).css({ left: 80 }).animate({ left: 0, opacity: "show" });
        $(".newsBtns span").removeClass("cur").eq(newsInd).addClass("cur");
        autoChangeNews();
    }

    function createNewsBtns() {
        var str = '';
        for (var i = 0; i < $(".newsBox li").size() ; i++) {
            str += '<span></span>';
        }

        $(".newsBtns").html(str).find("span").mouseover(function () {
            if ($(this).hasClass("cur")) {
                return;
            }
            newsInd = $(this).index();
            changeNews();
        }).eq(0).addClass("cur");

    }

    function setImgMax(img, imgW, imgH, tW, tH) {
        //设置图片宽高比例
        var tWidth = tW || win_width;
        var tHeight = tH || win_height;
        var coe = imgH / imgW;
        var coe2 = tHeight / tWidth;
        if (coe < coe2) {
            var imgWidth = tHeight / coe;
            img.css({ height: tHeight, width: imgWidth, left: -(imgWidth - tWidth) / 2, top: 0 });
        } else {
            var imgHeight = tWidth * coe;
            img.css({ height: imgHeight, width: tWidth, left: 0, top: -(imgHeight - tHeight) / 2 });
        }
    }

    $(window).resize(function () {
        init();
    });

});