用 table 自带的功能居中
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<table class="parent">
<tr>
<td class="child">
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</td>
</tr>
</table>
</body>
</html>
.parent{
border: 1px solid red;
height: 600px;
}
.child{
border: 1px solid green;
}
image.png
100% 高度的 afrer before 加上 inline block
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div class="parent">
<span class=before></span><div class="child">
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</div><span class=after></span>
</div>
</body>
</html>
.parent{
border: 3px solid red;
height: 600px;
text-align: center;
}
.child{
border: 3px solid black;
display: inline-block;
width: 300px;
vertical-align: middle;
}
.parent .before{
outline: 3px solid red;
display: inline-block;
height: 100%;
vertical-align: middle;
}
.parent .after{
outline: 3px solid red;
display: inline-block;
height: 100%;
vertical-align: middle;
}
image.png
依靠 table 的特性来居中（不太好）
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div class="table">
<div class="td">
<div class="child">
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</div>
</div>
</div>
</body>
</html>
div.table{
display: table;
border: 1px solid red;
height: 600px;
}
div.td{
display: table-cell;
border: 1px solid blue;
vertical-align: middle;
}
.child{
border: 10px solid black;
}
image.png
margin-top: -50%，transform:-50%来做到
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div class="parent">
<div class="child">
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</div>
</div>
</body>
</html>
.parent{
height: 600px;
border: 1px solid red;
position: relative;
}
.child{
border: 1px solid green;
width: 300px;
position: absolute;
top: 50%;
left: 50%;
transform:translate(-50%,-50%);
/* margin-left: -150px; */
height: 100px;
/* margin-top: -50px; */
}
image.png
absolute margin auto
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div class="parent">
<div class="child">
文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字
</div>
</div>
</body>
</html>
.parent{
height: 600px;
border: 1px solid red;
position: relative;
}
.child{
border: 1px solid green;
position: absolute;
width: 300px;
height: 200px;
margin: auto;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
image.png
最棒棒的flex
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div class="parent">
<div class="child">
文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字文字
</div>
</div>
</body>
</html>
.parent{
height: 600px;
border: 3px solid red;
display: flex;
justify-content: center;
align-items: center;
}
.child{
border: 3px solid green;
width: 300px;
word-break: break-all;
}
image.png
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