function setCookie(name, value, day) {
    if (day !== 0) {     //褰撹缃殑鏃堕棿绛変簬0鏃讹紝涓嶈缃甧xpires灞炴€э紝cookie鍦ㄦ祻瑙堝櫒鍏抽棴鍚庡垹闄
        var expires = day * 24 * 60 * 60 * 1000;
        var date = new Date(+new Date() + expires);
        document.cookie = name + "=" + escape(value) + ";expires=" + date.toUTCString();
    } else {
        document.cookie = name + "=" + escape(value);
    }
}
function getCookie(name) {
    var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
    if (arr = document.cookie.match(reg))
        return unescape(arr[2]);
    else
        return null;
}
function checkTab(i) {
    scrollTo(0, 0);
    // $target = $(".home_nav li").eq(i);
    $target = $(".home_nav li[data-index="+i+"]");
    $target.addClass("active");
    $target.siblings().removeClass("active");
    setCookie("tab-index", i);
    $(".app" + i).removeClass("hide");
    $(".app" + i).siblings(".app-wrapper").addClass("hide");
    $(".footer").attr("data-index", i);
}