html代码结构
<!--html-->
<div class="warp">
<img src="/test.png" class="img">
</div>
css
.warp {
width: 500px;
height: 350px;
line-height: 350px;
text-align: center;
background: #ccc;
}
.img{
display: inline-block;
width: auto;
height: auto;
max-width: 500px;
max-height: 100%;
vertical-align: middle;
}
横图效果

竖图效果

小图效果
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