水平居中方案:
父元素text-align为center搭配子元素display:inline-block
<head>
<style>
.wrap {
height: 200px;
text-align: center;
}
.wrap div {
display: inline-block;
}
</style>
</head>
<body>
<div class="wrap">
<div>I am in middle</div>
</div>
</body>
子元素的display为table，搭配margin:0 auto实现，实质上利用了table的特性
<head>
<style>
.wrap {
height: 200px;
}
.wrap div {
display: table;
margin:0 auto;
}
</style>
</head>
<body>
<div class="wrap">
<div>
123
</div>
</div>
</body>
当子元素宽度已知时，使用margin:0 auto
<head>
<style>
.wrap {
height: 200px;
}
.wrap div {
width: 100px;
margin:0 auto;
}
</style>
</head>
<body>
<div class="wrap">
<div>
123
</div>
</div>
</body>
利用Position定位结合Transform（css3）
<head>
<style>
.wrap {
height: 200px;
text-align: center;
position: relative;
}
.wrap div {
position: absolute;
left: 50%;
transform: translateX(-50%);
}
</style>
</head>
<body>
<div class="wrap">
<div>I am in middle</div>
</div>
</body>
垂直居中解决方案
绝对居中
<head>
<style>
.wrap {
height: 400px;
position: relative;
}
.inner {
height: 200px;
width: 200px;
margin: auto;
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
}
</style>
</head>
<body>
<div class="wrap">
<div class="inner">
123
</div>
</div>
</body>
利用Tranform
<head>
<style>
.wrap {
height: 400px;
position: relative;
}
.inner {
height: 200px;
width: 200px;
margin: auto;
position: absolute;
top: 50%;
left: 50%;
transform: translateX(-50%) translateY(-50%);
}
</style>
</head>
<body>
<div class="wrap">
<div class="inner">
123
</div>
</div>
</body>
单行inline
<head>
<style>
.wrap {
height: 400px;
position: relative;
}
.inner {
height: 400px;
width: 200px;
line-height: 400px;
text-align: center;
margin:0 auto;
}
</style>
</head>
<body>
<div class="wrap">
<div class="inner">
123
</div>
</div>
</body>
