關於CSS佈局技巧的總結分享-css教學-PHP中文網

單列佈局

水平居中

父元素text-align:center;子元素：inline-block;

優點：相容性好；

不足：需要同時設定子元素和父元素

<!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>

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#子元素margin:0 auto;

#優點：相容性好
缺點：需要指定寬度

<!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>

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子元素{display:table;margin:0 auto;}

優點:只需要對自己進行設定
不足:IE6,7需要調整結構

<!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>

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父元素：relative；子元素：absolute；left:50%;margin-left:-寬度的一半

## 優點：相容性好

##缺點：需要知道子元素的寬度

<!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>

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缺點：不需要知道子元素的寬度

<!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>

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缺點：相容性差

<!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>

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垂直居中

#### ##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>

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<!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。-->

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#########父元素：position:relative;子元素：positon:absolute;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>

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#########父元素：position:relative;子元素：positon:absolute;top:50%;margin-top:-子元素高度的一半;############父元素：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>

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###水平垂直居中### #########父元素：display:table-cell;vertical-align:middle;text-align:center;###子元素；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>

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#########父元素：position:relative;###子元素：position:absolute

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