jquery – 限制纵向图像上的图像宽度/保持纵横比

<style>
figure {
    outline: green solid 1px;
    padding: 2px;
}
img {
    width: 100%;
    height: 100%;
    display: block;
    position: relative;

    outline: red solid 1px;
    opacity: .5;
}
.scale img{
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    margin: 0 auto;
    vertical-align: middle;
}
.toheight img{
    max-width: none;
}
</style>
<figure class="scale toheight" width="200" height="200">
    <img src="http://placekitten.com/250/300"/>
</figure>

容器http://jsfiddle.net/iegik/ZzXru/中的裁剪或缩放图像的解决方案

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