fetch(next_url).then(
                response => response.text()
            ).then(data => {

                const parser = new DOMParser();
                const doc = parser.parseFromString(data, 'text/html');

let cnt = 2;
let blk = 0;
async function nextpage() {
    if (cnt !== blk) {
        blk = cnt;
        await (async () => {
            let next_url = "https://fox-black.com/blog/page/" + cnt;
            return await fetch(next_url).then(
                response => response.text()
            ).then(data => {
                const parser = new DOMParser();
                const doc = parser.parseFromString(data, 'text/html');
                let blogs = doc.querySelectorAll('.blogpage');
                cnt++;
                if (blogs[0].innerHTML !== undefined) {
                    document.querySelector(".foxpage").insertAdjacentHTML("beforeend", (function (elm) {
                        let str = "";
                        for (const key in elm) {
                            const element = elm[key];
                            if (element.innerHTML !== undefined) {
                                str += "<div class=\"blogpage\">" + element.innerHTML + "</div>";
                            }
                        }
                        return str;
                    })(blogs));
                } else {
                    if (document.querySelector("#fin") === null) {
                        document.querySelector(".foxpage").insertAdjacentHTML("beforeend", "<div id=\"fin\"></div>");
                    }
                }
            }).catch(error => {
                if (document.querySelector("#fin") === null) {
                    document.querySelector(".foxpage").insertAdjacentHTML("beforeend", "<div id=\"fin\"></div>");
                }
            });
        })();
    }
}

if (navigator.userAgent.match(/iPhone|Android.+Mobile/)) {
    window.addEventListener("scroll", async function () {
        let s = (() => {
            let tgt;
            if ('scrollingElement' in document) {
                tgt = document.scrollingElement;
            } else if (this.browser.isWebKit) {
                tgt = document.body;
            } else {
                tgt = document.documentElement;
            }
            return tgt;
        })();
        if (document.querySelector("#fin") === null && s.scrollTop >= (s.clientHeight - 650)) {
            await nextpage();
        }
    });
} else {
    document.querySelector(".foxpage").addEventListener("scroll", async function () {
        if (document.querySelector("#fin") === null && document.querySelector(".foxpage").scrollTop >= (document.querySelector(".foxpage").scrollHeight - 300)) {
            await nextpage();
        }
    });
}

let useKendata = [
    {'no':'01','name':'北海道'},
    {'no':'02','name':'青森県'},
    {'no':'03','name':'岩手県'},
    {'no':'04','name':'宮城県'},
    {'no':'05','name':'秋田県'},
    {'no':'06','name':'山形県'},
    {'no':'07','name':'福島県'},
    {'no':'08','name':'茨城県'},
    {'no':'09','name':'栃木県'},
    {'no':'10','name':'群馬県'},
    {'no':'11','name':'埼玉県'},
    {'no':'12','name':'千葉県'},
    {'no':'13','name':'東京都'},
    {'no':'14','name':'神奈川県'},
    {'no':'15','name':'新潟県'},
    {'no':'16','name':'富山県'},
    {'no':'17','name':'石川県'},
    {'no':'18','name':'福井県'},
    {'no':'19','name':'山梨県'},
    {'no':'20','name':'長野県'},
    {'no':'21','name':'岐阜県'},
    {'no':'22','name':'静岡県'},
    {'no':'23','name':'愛知県'},
    {'no':'24','name':'三重県'},
    {'no':'25','name':'滋賀県'},
    {'no':'26','name':'京都府'},
    {'no':'27','name':'大阪府'},
    {'no':'28','name':'兵庫県'},
    {'no':'29','name':'奈良県'},
    {'no':'30','name':'和歌山県'},
    {'no':'31','name':'鳥取県'},
    {'no':'32','name':'島根県'},
    {'no':'33','name':'岡山県'},
    {'no':'34','name':'広島県'},
    {'no':'35','name':'山口県'},
    {'no':'36','name':'徳島県'},
    {'no':'37','name':'香川県'},
    {'no':'38','name':'愛媛県'},
    {'no':'39','name':'高知県'},
    {'no':'40','name':'福岡県'},
    {'no':'41','name':'佐賀県'},
    {'no':'42','name':'長崎県'},
    {'no':'43','name':'熊本県'},
    {'no':'44','name':'大分県'},
    {'no':'45','name':'宮崎県'},
    {'no':'46','name':'鹿児島県'},
    {'no':'47','name':'沖縄県'},
];
document.getElementById("ken").insertAdjacentHTML('afterbegin',(function(ken){
    let str = '';
    for (const key in ken) {
        str+= '<option value=' + ken[key].no + '>' + ken[key].name +'</option>';
    }
    return str;
}(useKendata)));