Auto-Fit vs Auto-Fill 可视化对比，HTML代码在线实时编辑、实时预览

index.html

style.css

index.js

index.html

            
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            <!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="./style.css">
  <script src="./index.js"></script>
</head>

<body>
   <div class="container">
        <header>
            <h1>Auto-Fit vs Auto-Fill 可视化对比</h1>
            <p class="subtitle">通过实时演示直观了解CSS Grid中auto-fit和auto-fit属性的区别，以及它们如何影响响应式布局</p>
        </header>

        <div class="controls">
            <div class="control-group">
                <h3>容器宽度控制</h3>
                <div class="slider-container">
                    <span>窄</span>
                    <input type="range" min="200" max="1000" value="800" class="slider" id="width-slider">
                    <span>宽</span>
                    <span class="value-display" id="width-value">800px</span>
                </div>
            </div>

            <div class="control-group">
                <h3>卡片数量</h3>
                <div class="slider-container">
                    <span>少</span>
                    <input type="range" min="1" max="12" value="6" class="slider" id="card-slider">
                    <span>多</span>
                    <span class="value-display" id="card-value">6 卡片</span>
                </div>
            </div>

            <div class="button-group">
                <button id="reset-btn">重置演示</button>
                <button id="toggle-cards-btn">切换卡片可见性</button>
            </div>
        </div>

        <div class="comparison">
            <div class="panel auto-fill">
                <div class="panel-header">
                    <h2>Auto-Fill 布局</h2>
                    <p>保留空轨道，适合需要固定网格结构的布局</p>
                </div>
                <div class="panel-content" id="auto-fill-container">
                    <div class="grid" id="auto-fill-grid">
                        <div class="card"><div class="card-number">1</div>卡片</div>
                        <div class="card"><div class="card-number">2</div>卡片</div>
                        <div class="card"><div class="card-number">3</div>卡片</div>
                        <div class="card"><div class="card-number">4</div>卡片</div>
                        <div class="card"><div class="card-number">5</div>卡片</div>
                        <div class="card"><div class="card-number">6</div>卡片</div>
                    </div>
                </div>
            </div>

            <div class="panel auto-fit">
                <div class="panel-header">
                    <h2>Auto-Fit 布局</h2>
                    <p>折叠空轨道，内容拉伸填充可用空间</p>
                </div>
                <div class="panel-content" id="auto-fit-container">
                    <div class="grid" id="auto-fit-grid">
                        <div class="card"><div class="card-number">1</div>卡片</div>
                        <div class="card"><div class="card-number">2</div>卡片</div>
                        <div class="card"><div class="card-number">3</div>卡片</div>
                        <div class="card"><div class="card-number">4</div>卡片</div>
                        <div class="card"><div class="card-number">5</div>卡片</div>
                        <div class="card"><div class="card-number">6</div>卡片</div>
                    </div>
                </div>
            </div>
        </div>

        <div class="explanation">
            <h2>理解 Auto-Fit 和 Auto-Fill</h2>
            <p>CSS Grid布局中的<code>auto-fit</code>和<code>auto-fill</code>关键字允许我们创建灵活的响应式布局，而无需编写复杂的媒体查询。它们都用于<code>repeat()</code>函数中，但与<code>minmax()</code>结合使用时，行为有所不同。</p>

            <div class="code-snippet">
                <span class="property">grid-template-columns</span>: <span class="value">repeat(<select id="code-type">
                    <option value="auto-fill">auto-fill</option>
                    <option value="auto-fit" selected>auto-fit</option>
                </select>, minmax(150px, 1fr))</span>;
            </div>

            <div class="key-differences">
                <div class="difference auto-fill-difference">
                    <h3><span class="difference-icon">↔️</span> Auto-Fill 行为</h3>
                    <p>Auto-fill会尽可能多地创建网格轨道，即使没有网格项填充它们。空轨道仍然占用空间，影响布局。</p>
                    <ul>
                        <li>保持网格结构完整</li>
                        <li>空轨道保持最小宽度</li>
                        <li>适合需要严格对齐的布局</li>
                        <li>在内容数量变化但网格结构需要保持不变时非常有用</li>
                    </ul>
                </div>

                <div class="difference auto-fit-difference">
                    <h3><span class="difference-icon">↕️</span> Auto-Fit 行为</h3>
                    <p>Auto-fit会折叠任何空轨道，并拉伸现有网格项以填充可用空间。它更注重内容的填充而非网格结构的保留。</p>
                    <ul>
                        <li>折叠空轨道</li>
                        <li>内容拉伸填满容器</li>
                        <li>适合卡片、画廊和内容块布局</li>
                        <li>在希望内容充分利用可用空间时非常有用</li>
                    </ul>
                </div>
            </div>
        </div>
    </div>
</body>

</html>

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style.css

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            padding: 2rem;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        header {
            text-align: center;
            margin-bottom: 3rem;
            padding: 2rem;
            background: rgba(255, 255, 255, 0.8);
            border-radius: 12px;
            box-shadow: 05px15pxrgba(0, 0, 0, 0.1);
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: #2c3e50;
        }

        .subtitle {
            font-size: 1.2rem;
            color: #7f8c8d;
            max-width: 800px;
            margin: 0 auto;
        }

        .comparison {
            display: flex;
            gap: 2rem;
            margin-bottom: 3rem;
        }

        @media (max-width:768px) {
            .comparison {
                flex-direction: column;
            }
        }

        .panel {
            flex: 1;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 08px20pxrgba(0, 0, 0, 0.1);
        }

        .panel-header {
            padding: 1.5rem;
            background: #3498db;
            color: white;
            text-align: center;
        }

        .auto-fill.panel-header {
            background: #e74c3c;
        }

        .auto-fit.panel-header {
            background: #2ecc71;
        }

        .panel-content {
            padding: 2rem;
            border: 2px dashed #ddd;
            margin: 1rem;
            border-radius: 8px;
            transition: all 0.3s ease;
            position: relative;
            min-height: 300px;
        }

        .auto-fill.panel-content {
            background: rgba(231, 76, 60, 0.05);
        }

        .auto-fit.panel-content {
            background: rgba(46, 204, 113, 0.05);
        }

        .grid {
            display: grid;
            gap: 1rem;
            grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        }

        .auto-fit .grid {
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        }

        .card {
            background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
            color: white;
            border-radius: 8px;
            padding: 1.5rem;
            text-align: center;
            box-shadow: 04px6pxrgba(0, 0, 0, 0.1);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 120px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .auto-fill.card {
            background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
        }

        .auto-fit.card {
            background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 08px15pxrgba(0, 0, 0, 0.2);
        }

        .card-number {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: 0.5rem;
        }

        .controls {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 05px15pxrgba(0, 0, 0, 0.1);
            margin-bottom: 2rem;
        }

        .control-group {
            margin-bottom: 1.5rem;
        }

        .control-grouph3 {
            margin-bottom: 0.5rem;
            color: #2c3e50;
        }

        .slider-container {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .slider {
            flex: 1;
            -webkit-appearance: none;
            height: 8px;
            border-radius: 4px;
            background: #ddd;
            outline: none;
        }

        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: #3498db;
            cursor: pointer;
        }

        .auto-fill.slider::-webkit-slider-thumb {
            background: #e74c3c;
        }

        .auto-fit.slider::-webkit-slider-thumb {
            background: #2ecc71;
        }

        .value-display {
            min-width: 60px;
            text-align: center;
            font-weight: bold;
        }

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

        button {
            padding: 0.8rem1.5rem;
            border: none;
            border-radius: 4px;
            background: #3498db;
            color: white;
            font-weight: bold;
            cursor: pointer;
            transition: background 0.3s ease;
        }

        button:hover {
            background: #2980b9;
        }

        .explanation {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 05px15pxrgba(0, 0, 0, 0.1);
        }

        .explanationh2 {
            margin-bottom: 1rem;
            color: #2c3e50;
        }

        .key-differences {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin-top: 2rem;
        }

        @media (max-width:768px) {
            .key-differences {
                grid-template-columns: 1fr;
            }
        }

        .difference {
            padding: 1.5rem;
            border-radius: 8px;
        }

        .auto-fill-difference {
            background: rgba(231, 76, 60, 0.1);
            border-left: 4px solid #e74c3c;
        }

        .auto-fit-difference {
            background: rgba(46, 204, 113, 0.1);
            border-left: 4px solid #2ecc71;
        }

        .differenceh3 {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
        }

        .difference-icon {
            margin-right: 0.5rem;
            font-size: 1.5rem;
        }

        .grid-track-visual {
            height: 4px;
            background: rgba(255, 255, 255, 0.5);
            margin-top: 0.5rem;
            border-radius: 2px;
        }

        .grid-track-indicator {
            height: 100%;
            background: white;
            border-radius: 2px;
            width: 100%;
        }

        .code-snippet {
            background: #2d3436;
            color: #dfe6e9;
            padding: 1rem;
            border-radius: 4px;
            font-family: 'Fira Code', monospace;
            margin: 1rem0;
            overflow-x: auto;
        }

        .property {
            color: #81ecec;
        }

        .value {
            color: #fab1a0;
        }

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index.js

            
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            // 获取DOM元素
        const widthSlider = document.getElementById('width-slider');
        const widthValue = document.getElementById('width-value');
        const cardSlider = document.getElementById('card-slider');
        const cardValue = document.getElementById('card-value');
        const autoFillContainer = document.getElementById('auto-fill-container');
        const autoFitContainer = document.getElementById('auto-fit-container');
        const autoFillGrid = document.getElementById('auto-fill-grid');
        const autoFitGrid = document.getElementById('auto-fit-grid');
        const resetBtn = document.getElementById('reset-btn');
        const toggleCardsBtn = document.getElementById('toggle-cards-btn');
        const codeType = document.getElementById('code-type');

        // 初始化卡片
        const initialCards = Array.from(autoFillGrid.children).map(card => card.outerHTML);

        // 更新容器宽度
        function updateContainerWidth() {
            const width = widthSlider.value;
            widthValue.textContent = `${width}px`;

            autoFillContainer.style.width = `${width}px`;
            autoFitContainer.style.width = `${width}px`;
        }

        // 更新卡片数量
        function updateCardCount() {
            const count = parseInt(cardSlider.value);
            cardValue.textContent = `${count} 卡片`;

            // 更新auto-fill网格
            autoFillGrid.innerHTML = '';
            for (let i = 0; i < count; i++) {
                autoFillGrid.innerHTML += initialCards[i % initialCards.length];
            }

            // 更新auto-fit网格
            autoFitGrid.innerHTML = '';
            for (let i = 0; i < count; i++) {
                autoFitGrid.innerHTML += initialCards[i % initialCards.length];
            }
        }

        // 切换卡片可见性
        function toggleCards() {
            const cards = document.querySelectorAll('.card');
            const isVisible = cards[0].style.opacity !== '0';

            cards.forEach(card => {
                card.style.opacity = isVisible ? '0' : '1';
                card.style.visibility = isVisible ? 'hidden' : 'visible';
            });

            toggleCardsBtn.textContent = isVisible ? '显示卡片' : '隐藏卡片';
        }

        // 重置演示
        function resetDemo() {
            widthSlider.value = 800;
            cardSlider.value = 6;
            updateContainerWidth();
            updateCardCount();

            const cards = document.querySelectorAll('.card');
            cards.forEach(card => {
                card.style.opacity = '1';
                card.style.visibility = 'visible';
            });

            toggleCardsBtn.textContent = '切换卡片可见性';
        }

        // 初始化
        updateContainerWidth();
        updateCardCount();

        // 事件监听器
        widthSlider.addEventListener('input', updateContainerWidth);
        cardSlider.addEventListener('input', updateCardCount);
        resetBtn.addEventListener('click', resetDemo);
        toggleCardsBtn.addEventListener('click', toggleCards);
        codeType.addEventListener('change', function() {
            if (this.value === 'auto-fill') {
                autoFillGrid.style.gridTemplateColumns = 'repeat(auto-fill, minmax(150px, 1fr))';
                autoFitGrid.style.gridTemplateColumns = 'repeat(auto-fill, minmax(150px, 1fr))';
            } else {
                autoFillGrid.style.gridTemplateColumns = 'repeat(auto-fit, minmax(150px, 1fr))';
                autoFitGrid.style.gridTemplateColumns = 'repeat(auto-fit, minmax(150px, 1fr))';
            }
        });

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