关于 $$ 符号的使用问题的说明（二补）

Yichen

前情提要：关于 $$ 符号的使用问题的说明（补）,对于论坛公式的使用说明。
公式转换器点击这里直接使用（可能不太稳定）。
源代码：
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title> MD 公式转换工具 </title>
    <style>
        :root {
            --primary: #6366f1;
            --primary-hover: #4f46e5;
            --bg: #f8fafc;
            --card-bg: rgba(255, 255, 255, 0.85);
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --border: #e2e8f0;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --glass: rgba(255, 255, 255, 0.2);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --spacing: 1.5rem;
            --radius: 12px;
        }

        @media (prefers-color-scheme: dark) {
            :root {
                --bg: #0f172a;
                --card-bg: rgba(15, 23, 42, 0.7);
                --text-primary: #f8fafc;
                --text-secondary: #94a3b8;
                --border: #1e293b;
                --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.25), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
                --glass: rgba(15, 23, 42, 0.4);
            }
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: var(--bg);
            color: var(--text-primary);
            line-height: 1.6;
            padding: 0;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background-image: 
                radial-gradient(at 80% 0%, hsla(189, 100%, 56%, 0.1) 0px, transparent 50%),
                radial-gradient(at 0% 50%, hsla(355, 100%, 93%, 0.1) 0px, transparent 50%);
        }

        .container {
            width: 100%;
            max-width: 1000px;
            margin: 0 auto;
            padding: var(--spacing);
            flex: 1;
        }

        header {
            text-align: center;
            margin-bottom: 3rem;
            padding-top: 2rem;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            background: linear-gradient(90deg, var(--primary), #8b5cf6);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.025em;
        }

        .subtitle {
            color: var(--text-secondary);
            font-size: 1.125rem;
            max-width: 600px;
            margin: 0 auto;
        }

        .tool-card {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 2.5rem;
            border: 1px solid var(--glass);
            transform: translateY(20px);
            opacity: 0;
            animation: fadeInUp 0.6s forwards;
            transition: var(--transition);
        }

        @keyframes fadeInUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .card-header {
            display: flex;
            align-items: center;
            margin-bottom: 1.5rem;
        }

        .card-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--primary), #8b5cf6);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            box-shadow: 0 4px 6px rgba(79, 70, 229, 0.15);
        }

        .card-icon svg {
            width: 24px;
            height: 24px;
            color: white;
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 600;
        }

        .card-description {
            color: var(--text-secondary);
            font-size: 0.875rem;
        }

        .textarea-container {
            position: relative;
            margin-bottom: 1.5rem;
        }

        .textarea-label {
            display: block;
            margin-bottom: 0.5rem;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--text-primary);
        }

        textarea {
            width: 100%;
            min-height: 150px;
            padding: 1rem;
            border: 1px solid var(--border);
            border-radius: 8px;
            resize: vertical;
            font-size: 0.9375rem;
            transition: var(--transition);
            background: var(--card-bg);
            color: var(--text-primary);
            box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
        }

        textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
        }

        .button-group {
            display: flex;
            gap: 1rem;
            margin: 2rem 0;
        }

        button {
            flex: 1;
            padding: 0.875rem 1rem;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.9375rem;
            font-weight: 500;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        button:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
        }

        button:active {
            transform: translateY(0);
        }

        button svg {
            width: 18px;
            height: 18px;
        }

        .stats {
            display: flex;
            justify-content: space-between;
            font-size: 0.8125rem;
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }

        .stat-item {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }

        .stat-item svg {
            width: 14px;
            height: 14px;
        }

        footer {
            text-align: center;
            padding: 2rem 0;
            color: var(--text-secondary);
            font-size: 0.875rem;
            margin-top: auto;
        }

        footer a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }

        footer a:hover {
            text-decoration: underline;
        }

        @media (max-width: 768px) {
            .container {
                padding: 1rem;
            }
            
            h1 {
                font-size: 2rem;
            }
            
            .tool-card {
                padding: 1.5rem;
            }
            
            .button-group {
                flex-direction: column;
            }
        }

        /* 微交互效果 */
        .copied {
            animation: pulse 1s;
        }

        @keyframes pulse {
            0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.4); }
            70% { box-shadow: 0 0 0 10px rgba(99, 102, 241, 0); }
            100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
        }
    </style>
</head>
<body>
    <div class="container">
        <header>
            <h1>Markdown 公式转换器</h1>
            <p class="subtitle">将 LaTeX 数学公式转换为兼容格式</p>
        </header>
        
        <main>
            <div class="tool-card">
                <div class="card-header">
                    <div class="card-icon">
                        <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9.663 17h4.673M12 3v1m6.364 1.636l-.707.707M21 12h-1M4 12H3m3.343-5.657l-.707-.707m2.828 9.9a5 5 0 117.072 0l-.548.547A3.374 3.374 0 0014 18.469V19a2 2 0 11-4 0v-.531c0-.895-.356-1.754-.988-2.386l-.548-.547z" />
                        </svg>
                    </div>
                    <div>
                        <h2 class="card-title">公式转换器</h2>
                        <p class="card-description">输入 Markdown 内容，自动转换兼容格式</p>
                    </div>
                </div>
                
                <div class="textarea-container">
                    <label for="input" class="textarea-label">输入 Markdown 内容</label>
                    <textarea id="input" placeholder="粘贴你的 Markdown 内容...&#10;示例：&#10;当 $a \\ne 0$ 时，方程解为：&#10;
$$
x = {-b \\pm \\sqrt{b^2-4ac} \\over 2a}
$$
"></textarea>
                </div>
                
                <div class="stats">
                    <div class="stat-item">
                        <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 7h8m0 0v8m0-8l-8 8-4-4-6 6" />
                        </svg>
                        <span id="inputStats">输入: 0 字符</span>
                    </div>
                    <div class="stat-item">
                        <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 17h8m0 0V9m0 8l-8-8-4 4-6-6" />
                        </svg>
                        <span id="outputStats">输出: 0 字符</span>
                    </div>
                </div>
                
                <div class="button-group">
                    <button onclick="convert()">
                        <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />
                        </svg>
                        立即转换
                    </button>
                    <button onclick="copyToClipboard()">
                        <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" />
                        </svg>
                        复制结果
                    </button>
                </div>
                
                <div class="textarea-container">
                    <label for="output" class="textarea-label">转换结果</label>
                    <textarea id="output" placeholder="转换结果将出现在这里..." readonly></textarea>
                </div>
            </div>
        </main>
    </div>

    <script>
        // 设置当前年份
        document.getElementById('current-year').textContent = new Date().getFullYear();
        
        function convert() {
            const input = document.getElementById("input").value;
            const output = input
                .replace(/\$\$(.*?)\$\$/gs, "[math]\n$1\n[/math]")
                .replace(/\$(.*?)\$/gs, "[imath]$1[/imath]");
            
            document.getElementById("output").value = output;
            updateStats();
            
            // 添加微交互
            const outputTextarea = document.getElementById("output");
            outputTextarea.classList.add('copied');
            setTimeout(() => outputTextarea.classList.remove('copied'), 1000);
        }

        function updateStats() {
            const input = document.getElementById("input").value;
            const output = document.getElementById("output").value;
            document.getElementById("inputStats").textContent = `输入: ${input.length} 字符`;
            document.getElementById("outputStats").textContent = `输出: ${output.length} 字符`;
        }

        async function copyToClipboard() {
            const output = document.getElementById("output");
            
            try {
                await navigator.clipboard.writeText(output.value);
                output.classList.add('copied');
                setTimeout(() => output.classList.remove('copied'), 1000);
                
                // 临时改变按钮文本
                const copyButton = document.querySelector('button[onclick="copyToClipboard()"]');
                const originalText = copyButton.innerHTML;
                copyButton.innerHTML = `
                    <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7" />
                    </svg>
                    已复制
                `;
                
                setTimeout(() => {
                    copyButton.innerHTML = originalText;
                }, 2000);
            } catch (err) {
                console.error('复制失败:', err);
            }
        }

        // 实时统计输入字符
        document.getElementById("input").addEventListener('input', updateStats);
        
        // 初始化动画
        document.addEventListener('DOMContentLoaded', () => {
            const cards = document.querySelectorAll('.tool-card');
            cards.forEach((card, index) => {
                card.style.animationDelay = `${index * 0.1}s`;
            });
        });
    </script>
</body>
</html>
代码由deepseek大模型生成，并进行了一些调整。
Ruibin_Ningh

@Yichen 感谢你的贡献
你的工具现在已托管到网站: https://tool.ruibin-ningh.top/bbs-formula
并且在首页的标签页顶置
Zyx-2012

可以考虑加一个实时转换，可以让用户直观的看到他输出的LaTeX是否正确
Yichen

Zyx-2012 有点困难
Ruibin_Ningh

Yichen 即将修复对于$无法识别的BUG,对于原来的公式,现在仍然可以使用[ math][/math](为了防止被识别多加了个空格)来书写公式
Zyx-2012

Yichen 没有关系AI可以助你，而且也就是引用一下别的库，可以找找
Ruibin_Ningh

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