图片比例和外部div比例不一致，最大程度占满，并且图片比例不变
其中1.jpg,2.jpg,1.html在同一目录

|-----|- 1.jpg|- 2.jpg|- 1.html

1.jpg
在这里插入图片描述
2.jpg

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>Document</title><style>.image-container {width: 600px;height: 600px;display: flex;justify-content: center;align-items: center;}.image-container img {max-width: 100%;max-height: 100%;width: auto;height: auto;object-fit: contain;}</style></head><body><div style="width: 600px; height: 600px"><div class="image-container"><img src="./1.jpg" alt="Example image" /></div></div><div style="width: 600px; height: 600px"><div class="image-container"><img src="./2.jpg" alt="Example image" /></div></div></body>
</html>

示例2，上面写法如果图片小于div会上下左右都有白

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>Document</title><style>.image-container {width: 600px;height: 600px;display: flex;justify-content: center;align-items: center;background-color: #f0f0f0; /* 添加背景色以便观察留白 */}.image-container img {object-fit: contain; /* 保持比例，确保整个图片可见 */width: 100%;height: 100%;}</style></head><body><div style="width: 600px; height: 600px"><div class="image-container"><img src="./3.jpg" alt="Example image" /></div></div><div style="width: 600px; height: 600px"><div class="image-container"><img src="./1.jpg" alt="Example image" /></div></div><div style="width: 600px; height: 600px"><div class="image-container"><img src="./2.jpg" alt="Example image" /></div></div></body>
</html>