Élément parent text-align:center; élément enfant : inline-block;
Avantages : bonne compatibilité ;
Inconvénients : nécessité de définir des éléments enfants et des éléments parents en même temps
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
text-align: center;
}
.child {
display: inline-block;
width: 300px;
height: 100px;
background: blue;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Marge de l'élément enfant :0 auto;
Avantages : Bonne compatibilité
Inconvénients : Nécessité de spécifier la largeur
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
}
.child {
width: 300px;
height: 100px;
background: blue;
margin:0 auto;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>élément enfant {display:table;margin:0 auto;}
Avantages : Il vous suffit de vous configurer
Inconvénients : IE6 et 7 doivent ajuster la structure
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
}
.child {
width: 300px;
height: 100px;
background: blue;
margin:0 auto;
display:table;margin:0 auto;s
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Élément parent : relatif ; élément enfant : absolu ; gauche : 50 % ; marge-gauche : - moitié de la largeur
Avantages : Bonne compatibilité
Inconvénients : nécessité de connaître la largeur de l'élément enfant
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
position: relative;
top: 0;
left: 0;
}
.child {
width: 300px;
height: 100px;
background: blue;
position: absolute;
top: 0;
left: 50%;
margin-left: -150px;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Élément parent : relatif ; élément enfant : absolu;left:50%;transform:translate(-50%,0);
Avantages : mauvaise compatibilité
Inconvénients : Pas besoin de connaître la largeur de l'élément enfant
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
position: relative;
top: 0;
left: 0;
}
.child {
width: 300px;
height: 100px;
background: blue;
position: absolute;
top: 0;
left: 50%;
transform: translate(-50%,0);
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Boîte flexible : Élément parent : display:flex;justify-content:center;
Avantages : Simple
Inconvénients : Mauvaise compatibilité
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
display: flex;
justify-content: center;
}
.child {
width: 300px;
height: 100px;
background: blue;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>vertical-align:center;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
display:table-cell;
vertical-align:middle;
}
.child {
width: 300px;
height: 100px;
background: blue;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>垂直居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
vertical-align:middle;
line-height:450px;
}
.child {
width: 300px;
height: 100px;
background: blue;
display:inline-block;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>
<!-- 这种方法需要知道父元素和子元素的高度，父元素的line-height的值为父元素高度减去子元素高度的一半。-->Élément parent : position : relative ; Éléments enfants : positon: absolu; top: 50%; transform:translate (0,-50%);
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>垂直居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
position: relative;
top: 0;
left: 0;
}
.child {
width: 300px;
height: 100px;
background: blue;
position: absolute;
top: 50%;
left:0;
transform: translate(0,-50%);
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Élément parent : position : relative ;Élément enfant : position :absolue;top :50 %;margin-top : la moitié de la hauteur de l'élément enfant ;
Élément parent : display:flex;align-items:center
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>垂直居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
display: flex;
align-items: center;
}
.child {
width: 300px;
height: 100px;
background: blue;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Élément parent : display :table-cell;vertical-align:middle;text-align:center ;
élément enfant; display:inline-block;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>垂直居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
display:table-cell;
vertical-align:middle;
text-align:center;
}
.child {
width: 300px;
height: 100px;
background: blue;
display: inline-block;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html> Élément parent : position : relative ;
Élément enfant : position : absolue
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