<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.box{
float: left;
}
.box1{
width: 400px;
height: 400px;
border:1px solid #000;display: table-cell;
text-align: center;
vertical-align: middle;/*不能浮动，即使父级小也会自动撑开父级*/
}
.box1>img{
vertical-align: middle;
}.box2{
position: relative;
overflow: hidden;
width: 400px;
height: 400px;
border:1px solid #000;/*父级必须比子级大，有可能包不住图片，包不住的时候从左上方开始截*/
.box2>img{
position:absolute;
margin: auto;
top: 0;
bottom: 0;
right: 0;
left: 0;
}.box3{
position: relative;
overflow: hidden;
width: 400px;
height: 400px;
border: 1px solid #000;
/*父级必须比子级大，有可能包不住图片，包不住的时候从图片中间开始截*/
.box3>img{
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%,-50%);
transform: translate(-50%,-50%);
}.box4{
width: 400px;
height: 400px;
line-height: 400px;
font-size: 0;
text-align: center;border: 1px solid #000;
/*font-size:0不写居中是有误差的*/
}.box4>img{
vertical-align:middle;
}.box5{
display: -webkit-box;
display: box;
display: -webkit-flex;
display: flex;
width: 400px;
height: 400px;
align-items: center;
justify-content: center;
border: 1px solid #000;
/*父级必须比子级大，有可能包不住图片，包不住的时候从图片中间开始截*/
.box6{
width: 400px;
height: 400px;
display: table-cell;
text-align: center;
border: 1px solid red;
/*如果div比图片小就不会显示图片了*/
}.box6>span{
display:inline-block;
height:100%;
vertical-align:middle;
}.box6>img{
vertical-align: middle;
}.box7{
width: 400px;
height: 400px;
position:relative;
display: table;
border: 1px solid #000;}
.box7>span{
*position:absolute;/*IE7*/
top:50%;
left: 50%;
display:table-cell;
text-align:center;
vertical-align:middle;
}.box7>span>img{
*position:relative;/*IE7*/
top:-50%;
left: -50%;
vertical-align:top;
}</style>
</head>
<body>
<div class="box1"><img src="biaoge-image.png" alt=""></div>
<div class="box box2"><img src="biaoge-image.png" alt=""></div>
<div class="box box3"><img src="biaoge-image.png" alt=""></div>
<div class="box box4"><img src="biaoge-image.png" alt=""></div>
<div class="box box5"><img src="biaoge-image.png" alt=""></div>
<div class="box box6"><span></span><img src="biaoge-image.png" alt=""></div>
<div class="box box7"><span><img src="biaoge-image.png" alt=""></span></div>
</body>
</html>
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