CSS让图片在div盒子里居中
第一种：用css的position属性
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
.div1 {
width: 200px;
height: 200px;
border: 1px solid #000000;
position: relative;
}
img {
width: 100px;
height: 100px;
position: absolute;
margin: auto;
top: 0;
left: 0;
right: 0;
bottom: 0;
}
</style>
</head>
<body>
<div class="div1">
<img src="img/1.jpg" />
</div>
</body>
</html>
效果图：
第二种：利用css3的新增属性table-cell, vertical-align:middle;
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
.div {
width: 200px;
height: 200px;
border: 1px solid #000000;
display: table-cell;
vertical-align: middle;
}
img {
width: 100px;
height: 100px;
display: block;
margin: auto;
}
</style>
</head>
<body>
<div class="div">
<img src="img/1.jpg" />
</div>
</body>
</html>
效果：
第三种：利用flexbox布局
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
.div {
width: 200px;
height: 200px;
border: 1px solid #000000;
display: flex;
/*!*flex-direction: column;*!可写可不写*/
justify-content: center;
align-items: center;
}
img {
width: 100px;
height: 100px;
display: block;
margin: auto;
}
</style>
</head>
<body>
<div class="div">
<img src="img/1.jpg" />
</div>
</body>
</html>
效果：
第四种：利用transform的属性（缺点：需要支持Html5）
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
.div {
width: 200px;
height: 200px;
border: 1px solid #000000;
position: relative;
}
img {
width: 100px;
height: 100px;
position: absolute;
top: 50%;
left: 50%;
-ms-transform: translate(-50%, -50%);
-moz-transform: translate(-50%, -50%);
-o-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div class="div">
<img src="img/1.jpg" />
</div>
</body>
</html>
效果图：
