//open http://gosms.gomocdn.com/mms/v14/index.html
//paste to console:

const tourl = x => `https://gs.3g.cn/D/${x.toString(16)}/w`;
const parseFile = url =>
    url.split('=')[1].split('&')[0].replaceAll('%2F', '/').replaceAll('%3A', ':');

let start = 1405742, ppage = 9;

const iframe = src => `<iframe src="${src}" style='height: 400px;'></iframe>`;
const html = `
    <style>body{background: #000; overflow: scroll; font-size: 16px;} nav {width: 100%;display: flex;position: fixed;left: 0;background: #000;padding: 20px;} nav .panel {margin: auto;color: red;display: flex;color: red;}nav .panel button {background: red;border: none;margin-right: 5px;}nav .panel * {font-family: monospace;}nav .panel input {background: #000;border: 1px solid red;width: 80px;color: red;margin-right: 10px;} </style>

    <nav>
    <div class="panel">
    <label for="ppage">files per page:
        <input type="text" id="ppage" value='9'/>
    </label>
    <label for="start">start id:
        <input type="text" id="start" value='1405742'/>
    </label>
    <button onclick="rem();go(false)">back</button>
    <button onclick="rem();go()">next</button>
    </div>
    </nav>

    <div id='box'></div>
    `;

document.body.innerHTML = html;
const box = document.querySelector('#box'),
      ppageEl = document.getElementById('ppage'),
      startEl = document.getElementById('start');

const reset = () => {
    console.log(ppage, start)
    ppage = parseInt(ppageEl.value);
    start = parseInt(startEl.value);
}

const rem = () => box.innerHTML = '';
const go = (to = true) => {
    reset();
    start += to ? ppage : -ppage;
    startEl.value = start;
    const urls = Array(ppage).fill(start).map((i, j) => i + j).map(x => tourl(x));
    box.innerHTML = urls.map(u => iframe(u)).join('\n');
}

go();