css-aspect-ratio 宽高比 | 开创者教程

实例代码

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>指定尺寸的宽高比演示</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 1000px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f5f5f5;
        }
        
        h1 {
            color: #333;
            text-align: center;
            margin-bottom: 30px;
        }
        
        .section {
            margin-bottom: 40px;
            background-color: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        h2 {
            margin-top: 0;
            color: #444;
            border-bottom: 1px solid #eee;
            padding-bottom: 10px;
        }
        
        .container {
            display: flex;
            gap: 20px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        
        .box {
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            margin-bottom: 10px;
        }
        
        /* 固定宽度示例 */
        .fixed-width .video-container {
            aspect-ratio: 16 / 9;
            width: 400px;
            background-color: #3498db;
        }
        
        .fixed-width .square {
            aspect-ratio: 1 / 1;
            width: 200px;
            background-color: #e74c3c;
        }
        
        .fixed-width .old-tv {
            aspect-ratio: 4 / 3;
            width: 300px;
            background-color: #2ecc71;
        }
        
        /* 固定高度示例 */
        .fixed-height .video-container {
            aspect-ratio: 16 / 9;
            height: 180px;
            background-color: #3498db;
        }
        
        .fixed-height .square {
            aspect-ratio: 1 / 1;
            height: 150px;
            background-color: #e74c3c;
        }
        
        .fixed-height .old-tv {
            aspect-ratio: 4 / 3;
            height: 120px;
            background-color: #2ecc71;
        }
        
        /* 百分比宽度示例 */
        .percentage-width .video-container {
            aspect-ratio: 16 / 9;
            width: 60%;
            background-color: #3498db;
        }
        
        .percentage-width .square {
            aspect-ratio: 1 / 1;
            width: 30%;
            background-color: #e74c3c;
        }
        
        .percentage-width .old-tv {
            aspect-ratio: 4 / 3;
            width: 45%;
            background-color: #2ecc71;
        }
        
        .code {
            background-color: #f0f0f0;
            padding: 10px;
            border-radius: 4px;
            font-family: monospace;
            margin-top: 10px;
            font-size: 14px;
        }
    </style>
</head>
<body>
    <h1>指定宽度或高度的 Aspect Ratio 演示</h1>
    
    
    <div class="section fixed-width">
        <h2>1. 固定宽度 + aspect-ratio</h2>
        <p>指定具体宽度值，高度根据宽高比自动计算</p>
        
        <div class="container">
            <div class="box video-container">16:9<br>宽度: 400px</div>
            <div class="box square">1:1<br>宽度: 200px</div>
            <div class="box old-tv">4:3<br>宽度: 300px</div>
        </div>
        
        <div class="code">
            .fixed-width .video-container {<br>
              aspect-ratio: 16 / 9;<br>
              width: 400px;<br>
            }<br><br>
            
            .fixed-width .square {<br>
              aspect-ratio: 1 / 1;<br>
              width: 200px;<br>
            }
        </div>
    </div>
    
    
    <div class="section fixed-height">
        <h2>2. 固定高度 + aspect-ratio</h2>
        <p>指定具体高度值，宽度根据宽高比自动计算</p>
        
        <div class="container">
            <div class="box video-container">16:9<br>高度: 180px</div>
            <div class="box square">1:1<br>高度: 150px</div>
            <div class="box old-tv">4:3<br>高度: 120px</div>
        </div>
        
        <div class="code">
            .fixed-height .video-container {<br>
              aspect-ratio: 16 / 9;<br>
              height: 180px;<br>
            }<br><br>
            
            .fixed-height .square {<br>
              aspect-ratio: 1 / 1;<br>
              height: 150px;<br>
            }
        </div>
    </div>
    
    
    <div class="section percentage-width">
        <h2>3. 百分比宽度 + aspect-ratio</h2>
        <p>使用百分比宽度，创建响应式布局</p>
        
        <div class="container">
            <div class="box video-container">16:9<br>宽度: 60%</div>
            <div class="box square">1:1<br>宽度: 30%</div>
            <div class="box old-tv">4:3<br>宽度: 45%</div>
        </div>
        
        <div class="code">
            .percentage-width .video-container {<br>
              aspect-ratio: 16 / 9;<br>
              width: 60%;<br>
            }<br><br>
            
            .percentage-width .square {<br>
              aspect-ratio: 1 / 1;<br>
              width: 30%;<br>
            }
        </div>
    </div>
</body>
</html>