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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>测试</title>
<style type="text/css">
a{
display: flex;
justify-content: center;
align-items: center;
width : 500px;
height:500px;
background: #efefef;
}
img{
vertical-align: middle;
max-width:90%;
max-height:90%;
}
</style>
</head>
<body>
<div>
<a href="">
<img src="1.jpg" alt="">
</a>
</div>
</body>
</html>
效果展示：
