✏ 编辑: clear-cache.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
    <meta http-equiv="Pragma" content="no-cache">
    <meta http-equiv="Expires" content="0">
    <title>Clear Cache & Refresh</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        
        .container {
            background: white;
            padding: 40px;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            max-width: 600px;
            width: 100%;
            text-align: center;
        }
        
        h1 {
            color: #333;
            margin-bottom: 20px;
            font-size: 32px;
        }
        
        .icon {
            font-size: 80px;
            margin-bottom: 20px;
        }
        
        .info {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            margin: 20px 0;
            text-align: left;
        }
        
        .info h3 {
            color: #667eea;
            margin-bottom: 15px;
        }
        
        .info ol {
            padding-left: 20px;
        }
        
        .info li {
            margin: 10px 0;
            line-height: 1.6;
        }
        
        .btn {
            display: inline-block;
            padding: 15px 40px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            font-size: 18px;
            margin: 10px;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
        }
        
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
        }
        
        .btn-secondary {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            box-shadow: 0 4px 15px rgba(245, 87, 108, 0.4);
        }
        
        .btn-secondary:hover {
            box-shadow: 0 6px 20px rgba(245, 87, 108, 0.6);
        }
        
        .status {
            background: #d4edda;
            color: #155724;
            padding: 15px;
            border-radius: 8px;
            margin: 20px 0;
            border: 1px solid #c3e6cb;
        }
        
        .keyboard-shortcut {
            background: #e9ecef;
            padding: 5px 10px;
            border-radius: 5px;
            font-family: monospace;
            font-weight: bold;
        }
        
        .loading {
            display: none;
            margin: 20px 0;
        }
        
        .spinner {
            border: 4px solid #f3f3f3;
            border-top: 4px solid #667eea;
            border-radius: 50%;
            width: 50px;
            height: 50px;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="icon">🔄</div>
        <h1>Cache Clear Helper</h1>
        
        <div class="status">
            ✓ This page is not cached and always loads fresh data
        </div>
        
        <div class="info">
            <h3>🛠️ How to Fix Cache Issues:</h3>
            <ol>
                <li><strong>Hard Refresh:</strong> Press <span class="keyboard-shortcut">Ctrl+Shift+R</span> (Windows) or <span class="keyboard-shortcut">Cmd+Shift+R</span> (Mac)</li>
                <li><strong>Clear Browser Cache:</strong>
                    <ul>
                        <li>Chrome: Settings → Privacy → Clear browsing data</li>
                        <li>Firefox: Settings → Privacy → Clear Data</li>
                        <li>Safari: Develop → Empty Caches</li>
                    </ul>
                </li>
                <li><strong>Try Incognito Mode:</strong> Open the book page in a private/incognito window</li>
                <li><strong>Disable Cache (Dev Mode):</strong>
                    <ul>
                        <li>Open Developer Tools (F12)</li>
                        <li>Go to Network tab</li>
                        <li>Check "Disable cache"</li>
                    </ul>
                </li>
            </ol>
        </div>
        
        <div class="info">
            <h3>✅ What's Been Fixed:</h3>
            <ul>
                <li>✓ Added aggressive cache prevention headers</li>
                <li>✓ Implemented cache-busting for images (timestamp in URL)</li>
                <li>✓ Added JavaScript to force reload from cache</li>
                <li>✓ CSS files now have version parameter</li>
                <li>✓ Database paths cleaned (no 'images/books/' prefix)</li>
            </ul>
        </div>
        
        <div class="loading" id="loading">
            <div class="spinner"></div>
            <p>Loading book page...</p>
        </div>
        
        <div id="buttons">
            <a href="book.php?nocache=<?php echo time(); ?>" class="btn" onclick="showLoading()">
                📚 Go to Book Page (Fresh Load)
            </a>
            <br>
            <a href="javascript:location.reload(true)" class="btn btn-secondary">
                🔄 Hard Reload This Page
            </a>
        </div>
        
        <p style="margin-top: 30px; color: #666; font-size: 14px;">
            Current Time: <?php echo date('Y-m-d H:i:s'); ?><br>
            Random Version: <?php echo mt_rand(100000, 999999); ?>
        </p>
    </div>
    
    <script>
        function showLoading() {
            document.getElementById('loading').style.display = 'block';
            document.getElementById('buttons').style.opacity = '0.5';
        }
        
        // Force clear service worker cache if exists
        if ('serviceWorker' in navigator) {
            navigator.serviceWorker.getRegistrations().then(function(registrations) {
                for(let registration of registrations) {
                    registration.unregister();
                }
            });
        }
        
        // Clear all caches
        if ('caches' in window) {
            caches.keys().then(function(names) {
                for (let name of names) {
                    caches.delete(name);
                }
            });
        }
        
        console.log('%c✓ Cache cleared!', 'color: green; font-size: 20px; font-weight: bold;');
        console.log('Page loaded at:', new Date().toLocaleString());
    </script>
</body>
</html>

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