使用absolute，完整代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<style>
#cont{
width: 364px;
background:white;
height:246px;
border: 1px solid #999999;
position:relative;
overflow:hidden;
}
#cont img{
position: absolute;
top:0;
left:50%;
height:100%;
transform:translateX(-50%);
}
</style>
</head>
<body>
<div id="cont"><img src="//repo.bfw.wiki/bfwrepo/image/6137fd7080f52.png"></div>
</body>
</html>
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