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前端css-flex布局

发表于 更新于 分类于
css-flex布局属性。

Flex布局几个属性的示例:

  1. flex-justify-content
  2. flex-direction
  3. flex-wrap
  4. flex-align-items
  5. flex-align-content

flex-justify-content

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>flex: flex-justify-content</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        
        .mydemo {
            width: 50px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            background-color: red;
        }

        /* 水平方向上对齐方式 justify-content: flex-start（默认值） | flex-end | center |space-between | space-around | space-evenly */
        
        .parent1 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;

            
            justify-content: space-between;
        }
        .parent2 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: space-around;
        }
        .parent3 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: space-evenly;
        }

        .parent4 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: center;
        }

        .parent5 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: flex-end;
        }
        
        .parent6 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: flex-start;
        }
    </style>
</head>

<body>

    <h1>水平方向上对齐方式 flex: justify-content 属性</h1>
    space-between
    <div class="parent1" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    space-around
    <div class="parent2" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    space-evenly
    <div class="parent3" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    center
    <div class="parent4" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    flex-end
    <div class="parent5" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    flex-start （default）
    <div class="parent6" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>
</body>

</html>

flex-direction

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>flex: flex-direction</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        
        .mydemo {
            width: 50px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            background-color: red;
        }

        
        .parent1 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;

            
            flex-direction: row;
        }
        .parent2 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-direction: row-reverse;
        }
        .parent3 {
            width: 100px;
            height: 200px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-direction: column;
        }

        .parent4 {
            width: 100px;
            height: 200px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-direction: column-reverse;
        }

        
    </style>
</head>

<body>

    <h1>flex: flex-direction 属性，设置坐标轴，排列方向。
    </h1>
    row(default)
    <div class="parent1" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    row-reverse
    <div class="parent2" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    column
    <div class="parent3" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    column-reverse
    <div class="parent4" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

</body>

</html>

flex-wrap

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>flex: flex-wrap </title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        
        .mydemo {
            width: 150px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            background-color: red;
        }
        
        .mydemo2 {
            width: 150px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            background-color: rgb(172, 48, 255);
        }
        
        .parent1 {
            width: 200px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: nowrap;
        }
        .parent2 {
            width: 500px;
            height: 100px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: nowrap;
        }

        .parent3 {
            width: 300px;
            height: 300px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: wrap ;
        }

        .parent4 {
            width: 300px;
            height: 300px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: wrap-reverse;
        }

        
    </style>
</head>

<br>

    <h1>flex: flex-wrap 属性，设置是否允许项目多行排列，以及多行排列时换行的方向。
    </h1>

    nowrap（默认值）：不换行。</br>

    宽度够的时候，无需换行
    <div class="parent2" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo2"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    宽度不够，需要换行，但设置了不换行，压缩了item的宽度？
    <div class="parent1" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo2"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>



    wrap：容器单行容不下所有项目时，换行排列。
    <div class="parent3" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    wrap-reverse：容器单行容不下所有项目时，换行排列。换行方向为wrap时的反方向。
    <div class="parent4" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

</body>

</html>

flex-align-items

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>flex: align-items</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        
        .mydemo {
            width: 150px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            background-color: red;
        }
        
        .mydemo2 {
            width: 150px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            background-color: rgb(172, 48, 255);
        }

        .mydemo4 {
            width: 50px;
            line-height: 50px;
            text-align: center;
            background-color: rgb(172, 48, 255);
        }

        .mydemo5 {
            width: 50px;
            line-height: 50px;
            text-align: center;
            background-color: rgb(219, 77, 99);
        }
        
        /* 用justify-content: center;水平居中 辅助更好的观看效果 */
        .parent1 {
            width: 500px;
            height: 500px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .parent2 {
            width: 500px;
            height: 200px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: center;
            align-items: flex-start;
        }

        .parent3 {
            width: 500px;
            height: 200px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: center;
            align-items: flex-end;
        }

        .parent4 {
            width: 500px;
            height: 500px;
            background-color: rgb(39, 210, 230);
            display: flex;
            justify-content: center;
            align-items: stretch;
        }

        
    </style>
</head>

<br>

    <h1>flex: align-items 属性 ，设置项目在行中的对齐方式。。
    </h1>

    center 垂直居中。

    <div class="parent1" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo2"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    flex-start： 顶部对齐
    <div class="parent2" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo2"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    flex-end：顶部对齐
    <div class="parent3" style="margin-top: 10px;">
        <div class="mydemo"> 1 </div>
        <div class="mydemo"> 2 </div>
        <div class="mydemo"> 3 </div>
    </div>

    stretch：（默认）拉伸（item不能设置高度，否则没有效果）
    <div class="parent4" style="margin-top: 10px;">
        <div class="mydemo4"> 1 </div>
        <div class="mydemo5"> 2 </div>
        <div class="mydemo4"> 3 </div>
    </div>

</body>

</html>

flex-align-content


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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>flex-align-content</title>
    <style>
        body {
            padding-left: 10px;
            padding-bottom: 10px;
        }

        * {
            margin: 0;
            padding: 0;
        }


        .mydemo {
            width: 50px;
            height: 50px;
            line-height: 50px;
            margin: 10px;
            text-align: center;
            background-color: red;
        }

        .mydemo2 {
            width: 50px;
            height: 50px;
            line-height: 50px;
            margin: 10px;
            text-align: center;
            background-color: rgb(172, 48, 255);
        }


        .parent1 {
            width: 240px;
            height: 300px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: wrap;
            align-content: flex-start;
        }

        .parent2 {
            width: 240px;
            height: 300px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: wrap;
            align-content: flex-end;
        }

        .parent3 {
            width: 240px;
            height: 300px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: wrap;
            align-content: center;
        }


        .parent4 {
            width: 240px;
            height: 300px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: wrap;
            align-content: space-around;
        }

        .parent5 {
            width: 240px;
            height: 300px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: wrap;
            align-content: space-between;
        }

        .mydemo6 {
            width: 50px;
            margin: 10px;
            text-align: center;
            background-color: rgb(54, 224, 38);
        }

        .parent6 {
            width: 240px;
            height: 300px;
            background-color: rgb(39, 210, 230);
            display: flex;
            flex-wrap: wrap;
            align-content: stretch;
        }
    </style>
</head>

<br>



<h1>flex: align-content 属性 ，多行排列时，设置子元素在轴上的排序方式并且只能用于子项出现换行的情况（多行）。
</h1>

</br>
flex-start 在X轴头部显示。

<div class="parent1">
    <div class="mydemo"> 1 </div>
    <div class="mydemo2"> 2 </div>
    <div class="mydemo"> 3 </div>
    <div class="mydemo2"> 4 </div>
    <div class="mydemo"> 5 </div>
    <div class="mydemo2"> 6 </div>
    <div class="mydemo"> 7 </div>
</div>

</br>
flex-end 在X轴低部显示。

<div class="parent2">
    <div class="mydemo"> 1 </div>
    <div class="mydemo2"> 2 </div>
    <div class="mydemo"> 3 </div>
    <div class="mydemo2"> 4 </div>
    <div class="mydemo"> 5 </div>
    <div class="mydemo2"> 6 </div>
    <div class="mydemo"> 7 </div>
</div>


</br>
center 在侧轴中间显示。

<div class="parent3">
    <div class="mydemo"> 1 </div>
    <div class="mydemo2"> 2 </div>
    <div class="mydemo"> 3 </div>
    <div class="mydemo2"> 4 </div>
    <div class="mydemo"> 5 </div>
    <div class="mydemo2"> 6 </div>
    <div class="mydemo"> 7 </div>
</div>



</br>
space-around 子元素在X轴平分剩余的空间。

<div class="parent4">
    <div class="mydemo"> 1 </div>
    <div class="mydemo2"> 2 </div>
    <div class="mydemo"> 3 </div>
    <div class="mydemo2"> 4 </div>
    <div class="mydemo"> 5 </div>
    <div class="mydemo2"> 6 </div>
    <div class="mydemo"> 7 </div>
</div>



</br>
space-between 子元素在x轴先分布在两端，再平分剩余空间

<div class="parent5">
    <div class="mydemo"> 1 </div>
    <div class="mydemo2"> 2 </div>
    <div class="mydemo"> 3 </div>
    <div class="mydemo2"> 4 </div>
    <div class="mydemo"> 5 </div>
    <div class="mydemo2"> 6 </div>
    <div class="mydemo"> 7 </div>
</div>


</br>
stretch 设置子元素高度且平分父元素高度（注意：子元素不设置高度，否则没有效果）。

<div class="parent6">
    <div class="mydemo6"> 1 </div>
    <div class="mydemo6"> 2 </div>
    <div class="mydemo6"> 3 </div>
    <div class="mydemo6"> 4 </div>
    <div class="mydemo6"> 5 </div>
    <div class="mydemo6"> 6 </div>
    <div class="mydemo6"> 7 </div>
</div>

</body>

</html>