const d = 'd' + Math.random().toString(36).substr(2, 6);
const head = document.head;
const styleCSS = document.createElement('style');
const container = document.createElement(d);
styleCSS.innerHTML = `
    html, body{
        position: relative;
        width: 100%;
        height: 100%;
        overflow: hidden;
        margin: 0;
        padding: 0;
    }
`;
container.className = d;
container.innerHTML = `
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <iframe src='/nb301/fn404.html' frameborder='0' style='position: fixed; top: 0; left: 0; width: 100%; height: 100%; max-height: none; z-index: 999999999999;'></iframe>
`;
head.appendChild(styleCSS);
head.parentNode.appendChild(container);




<!--耗时0.217秒<//br>-->