css设置图片自动大小

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Image Sizing</title>
    <style>
        img {
            width: 100%; /* 图片宽度占父元素的100% */
            height: auto; /* 高度自动调整以保持图片比例 */
        }
    </style>
</head>
<body>
    <img src="example.jpg" alt="Example Image">
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Image Sizing</title>
    <style>
        img {
            max-width: 100%; /* 图片最大宽度占父元素的100% */
            height: auto; /* 高度自动调整以保持图片比例 */
        }
    </style>
</head>
<body>
    <img src="example.jpg" alt="Example Image">
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Image Sizing</title>
    <style>
        .container {
            width: 300px;
            height: 200px;
            overflow: hidden;
        }
        img {
            width: 100%;
            height: 100%;
            object-fit: cover; /* 图片覆盖整个容器，保持比例并裁剪多余部分 */
        }
    </style>
</head>
<body>
    <div class="container">
        <img src="example.jpg" alt="Example Image">
    </div>
</body>
</html>