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弹性布局-弹性容器

HTML基础标签
HTML基础标签原创
2019年11月05日 19:53:091093浏览

一、弹性容器的两种类型                                                   

1572938981642512.jpg                                                            

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹性容器的两种类型</title>
    <style>
        /*弹性容器通用样式*/
        .container{
            border:3px dashed red;
            margin: 15px;
            background:grey;
        }
        /*弹性元素通用样式*/
        .item{
            box-sizing: border-box;
            border: 1px solid;
            padding: 20px;
            background:grey;
        }
        /*块级弹性容器*/
        .flex{
            display:flex;
        }

    </style>
</head>
<body>
    <h3>块级 弹性盒子</h3>
    <div class="container flex">
        <span class="item">item1</span>
        <span class="item">item2</span>
        <span class="item">item3</span>
    </div>

    <h3>行级 弹性盒子</h3>
    <div class="container flex">
        <span class="item">item1</span>
        <span class="item">item2</span>
        <span class="item">item3</span>
        <span class="item">item4</span>
        <span class="item">item5</span>
        <span class="item">item6</span>
        <span class="item">item7</span>
    </div>
</body>
</html>

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二、弹性容器做导航                    

1572942747801160.jpg                                       

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹性容器做导航</title>
    <style>
        a{
            padding:4px 10px;
            margin: 0 5px;
            border-radius: 5px 0 5px 0 ;
            /*设置边框圆角*/
            text-decoration-line: none;
            /*去除下划线*/
            background-color:#ededed;
            box-shadow: 2px 0 1px grey;
            /*设置边框阴影*/
            color:black;
        }
        a:hover , a:focus , a:active{
            background-color:darkred;
            color:white;
            /*实现鼠标移动 tab切换 颜色变化*/
        }
        nav{
            display: flex;
            border-bottom: 1px solid orangered;
            /*定义弹性 设置下划线*/
        }
    </style>
</head>
<body>
<!--      定义导航链接部分 <nav>标签增强语义-->
<nav>
    <a href="">我的京东</a>
    <a href="">购物车</a>
    <a href="">嗨购双十一</a>
    <a href="">在线客服</a>
</nav>
</body>
</html>

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三、定义弹性容器的主轴方向:弹性元素在主轴上的排列方向

1572944509282936.jpg

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>定义弹性容器的主轴方向:弹性元素在主轴上的排列方向</title>
    <style>
        /*弹性容器通用样式*/
        .container {
            border: 2px dashed red;
            margin: 15px;
            background: #cdc;
        }
        /*弹性元素通用样式*/
        .item {
            box-sizing: border-box;
            border: 1px solid;
            padding: 15px;
            background: #ede;
        }
        /*块级弹性容器*/
        .flex {
            display: flex;
        }
        .row{
            flex-direction: row;
            /*弹性的水平方向:左→右*/
        }
        .row-reverse{
            flex-direction: row-reverse;
            /*反向 右→左*/
        }
        .column{
            flex-direction: column;
            /*弹性的垂直方向:上→下*/
        }
        .column-reverse{
            flex-direction: column-reverse;
            /*反向 下→上*/
        }


    </style>
</head>
<body>
<h3>1 row: 默认从左到右 水平排列</h3>
<div class="container flex row">
    <span class="item">item</span>
    <span class="item">item</span>
    <span class="item">item</span>
</div>
<h3>2 row-reverse: 从右到左 水平排列</h3>
<div class="container flex row-reverse">
    <span class="item">item</span>
    <span class="item">item</span>
    <span class="item">item</span>
</div>
<h3>3 column: 从上到下 垂直排列</h3>
<div class="container flex column">
    <span class="item">item</span>
    <span class="item">item</span>
    <span class="item">item</span>
</div>
<h3>4 column-reverse: 从下到上 垂直排列</h3>
<div class="container flex column-reverse">
    <span class="item">item</span>
    <span class="item">item</span>
    <span class="item">item</span>
</div>
</body>
</html>

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四、创建网站首页

1572946418722669.jpg

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>创建网站首页</title>
    <style>
        a{
            padding:4px 10px;
            margin: 0 5px;
            border-radius: 5px 0 5px 0 ;
            /*设置边框圆角*/
            text-decoration-line: none;
            /*去除下划线*/
            background-color:#ededed;
            box-shadow: 2px 0 1px grey;
            /*设置边框阴影*/
            color:black;
        }
        a:hover , a:focus , a:active{
            background-color:darkred;
            color:white;
            /*实现鼠标移动 tab切换 颜色变化*/
        }
        nav{
            display: flex;
            border-bottom: 1px solid orangered;
            /*定义弹性 设置下划线*/
        }
        * {
            /*参考轮廓线: 不占据页面空间*/
            /*outline: 1px solid #ccc;*/

            margin: 10px;
            padding: 10px;
        }
        /*将页面中主要布局元素全部转为弹性容器*/
        body, nav, main, article {
            display: flex;
        }
        /*设置全局, 内容区主轴垂直, 元素沿主轴排列*/
        body, article {
            flex-direction: column;
        }
        /*微调显示效果*/
        /*页脚添加上边框*/
        footer {
            border-top: 1px solid #ccc;
        }
        /*导航删除下内边距*/
        nav {
            padding-bottom: 0;
        }
        img{
            width: 300px;
            height: 150px;
        }
        herder img{
            width: 80px;
            height: 40px;
        }
    </style>
</head>
<body>
        <!--页眉-->
        <herder>
             <h2 style="color: red"></h2>
            <img src="44.jpg" alt="" >
        </herder>
        <!--导航-->
        <nav>
            <a href="">我的京东</a>
            <a href="">购物车</a>
            <a href="">嗨购双十一</a>
            <a href="">在线客服</a>
        </nav>
<!--        主体-->
         <main>
             <article>
                 <img src="11.JPG" alt="">
                 <p>三星双十一来袭</p>
                 <button>点击抢购</button>
             </article>
             <article>
                 <img src="22.JPG" alt="">
                 <p>手机双十一狂欢</p>
                 <button>点击查看</button>
             </article>
             <article>
                 <img src="33.JPG" alt="">
                 <p>键鼠吃鸡套装</p>
                 <button>点击查看</button>
             </article>
         </main>
<!--        页尾-->
        <footer>
         <p>Copyright:¨ 2010-2019 京东</p>
        </footer>
</body>
</html>

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五、弹性元素溢出与创建多行容器

1572947241546897.jpg                                                                  

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹性元素溢出与创建多行容器</title>
    <style>
        /*弹性容器通用样式*/
        .container {
            border: 2px dashed red;
            margin: 15px;
            background: #cdc;
        }
        /*弹性元素通用样式*/
        .item {
            box-sizing: border-box;
            border: 1px solid;
            padding: 20px;
            background: #ede;
        }
        /*块级弹性容器*/
        .flex {
            display: flex;
        }
        /*默认*/
        .container {
            width: 500px;
        }

        /*不换行*/
        .nowrap {
            flex-direction: row;
            flex-wrap: nowrap;
        }

        /*换行*/
        .wrap {
            flex-direction: row;
            flex-wrap: wrap;
        }

        .wrap-reverse {
            flex-direction: row;
            flex-wrap: wrap-reverse;
        }
    </style>
</head>
<body>
<h2>以主轴水平方向为例演示:</h2>
<!--默认: 弹性元素不会在主轴上换行,不会自动调整大小, 当主轴空间不足时, 会从边界溢出-->
<h3>1 nowrap: 默认不换行,元素自动缩小适应容器</h3>
<div class="container flex row nowrap">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
    <span class="item">item11</span>
</div>

<h3>2 wrap: 换行,元素超出容器边界后换到下一行继续显示</h3>
<div class="container flex row wrap">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
    <span class="item">item11</span>
</div>

<h3>3 wrap-reverse: 换行后,弹性元素在垂直方向反向排列</h3>
<div class="container flex row wrap-reverse">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
    <span class="item">item11</span>
</div>
</body>
</html>

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六、弹性元素流体布局(简称:弹性流)的简化

1572947781145735.jpg

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹性元素流体布局(简称:弹性流)的简化</title>
    <style>
        /*弹性容器通用样式*/
        .container {
            border: 2px dashed red;
            margin: 15px;
            background: #cdc;
        }
        /*弹性元素通用样式*/
        .item {
            box-sizing: border-box;
            border: 1px solid;
            padding: 20px;
            background: #ede;
        }
        /*块级弹性容器*/
        .flex {
            display: flex;
        }
        .container {
            width: 500px;
        }
        /*不换行*/
        .nowrap {
            /*简化: 其实这也是默认值*/
            flex-flow: row nowrap;
        }
        /*换行*/
        .wrap {
                /*简化*/
            flex-flow: row wrap;
        }
        .wrap-reverse {
                /*简化*/
            flex-flow: row wrap-reverse;
        }
    </style>
</head>
<body>
<h2>弹性流布局的简写语法演示:</h2>
<!--默认: 弹性元素不会在主轴上换行,不会自动调整大小, 当主轴空间不足时, 会从边界溢出-->
<h3>1 nowrap: 默认不换行,元素自动缩小适应容器</h3>
<div class="container flex row nowrap">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
    <span class="item">item11</span>
</div>

<h3>2 wrap: 换行,元素超出容器边界后换到下一行继续显示</h3>
<div class="container flex row wrap">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
    <span class="item">item11</span>
</div>

<h3>3 wrap-reverse: 换行后,弹性元素在垂直方向反转排列</h3>
<div class="container flex row wrap-reverse">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
    <span class="item">item11</span>
</div>

</body>
</html>

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七、

7.png

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹性元素在主轴上如何分布</title>
    <style>
        /*弹性容器通用样式*/
        .container {
            border: 2px dashed red;
            margin: 15px;
            background: #cdc;
        }
        /*弹性元素通用样式*/
        .item {
            box-sizing: border-box;
            border: 1px solid;
            padding: 5px;
            background: #ede;
        }
        /*块级弹性容器*/
        .flex {
            display: flex;
        }
        .container {
            width: 550px;
        }
        /*允许换行*/
        .wrap {
            flex-wrap: wrap;
        }
        /*默认值:弹性元素紧贴主轴起点开始排列*/
        .flex-start {
            justify-content: flex-start;
        }

        .flex-end {
            justify-content: flex-end;
        }

        .center {
            justify-content: center;
        }
        .space-between {
            justify-content: space-between;
        }
        /*会千万首尾元素与容器边界的空间,只有其它元素之间空间的一半*/
        .space-around {
            justify-content: space-around;
        }
        .space-evenly {
            justify-content: space-evenly;
        }
    </style>
</head>
<body>
<h2>弹性元素在主轴上如何分布:</h2>
<h3>1. flex-start: 主轴起点开始水平排列</h3>
<p>单行</p>
<div class="container flex flex-start">
    <span class="item">弹性元素 1</span>
    <span class="item">弹性元素 2</span>
    <span class="item">弹性元素 3</span>
</div>
<p>多行</p>
<div class="container flex flex-start wrap">
    <span class="item">弹性元素 1</span>
    <span class="item">弹性元素 2</span>
    <span class="item">弹性元素 3</span>
    <span class="item">弹性元素 4</span>
    <span class="item">弹性元素 5</span>
    <span class="item">弹性元素 6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>2 flex-end: 主轴终点开始水平排列</h3>
<p>单行</p>
<div class="container flex flex-end">
    <span class="item">弹性元素 1</span>
    <span class="item">弹性元素 2</span>
    <span class="item">弹性元素 3</span>
</div>
<p>多行</p>
<div class="container flex flex-end wrap">
    <span class="item">弹性元素 1</span>
    <span class="item">弹性元素 2</span>
    <span class="item">弹性元素 3</span>
    <span class="item">弹性元素 4</span>
    <span class="item">弹性元素 5</span>
    <span class="item">弹性元素 6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>3 center: 将所有弹性元素视为整体,居中显示</h3>
<p>单行</p>
<div class="container flex center">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
</div>
<p>多行</p>
<div class="container flex center wrap">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>4 space-between: 首尾元素紧贴起止点,其它元素平分剩余空间</h3>
<p>单行</p>
<div class="container flex space-between">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
</div>
<p>多行</p>
<div class="container flex space-between wrap">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>5 space-around: 每个元素二边空间相等,相邻元素空间累加</h3>
<p>单行</p>
<div class="container flex space-around">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
</div>
<p>多行</p>
<div class="container flex space-around wrap">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>6 space-evenly: 每个元素, 以及元素到与起止点的空间全部相等</h3>
<p>单行</p>
<div class="container flex space-evenly">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
</div>
<p>多行</p>
<div class="container flex space-evenly wrap">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
</div>
</body>
</html>

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八、使用弹性元素主轴对齐来改写导航

1572950448978512.jpg

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>使用弹性元素主轴对齐来改写导航</title>
    <style>
        a{
            padding:4px 10px;
            margin: 0 5px;
            border-radius: 5px 0 5px 0 ;
            /*设置边框圆角*/
            text-decoration-line: none;
            /*去除下划线*/
            background-color:#ededed;
            box-shadow: 2px 0 1px grey;
            /*设置边框阴影*/
            color:black;
        }
        a:hover , a:focus , a:active{
            background-color:darkred;
            color:white;
            /*实现鼠标移动 tab切换 颜色变化*/
        }
        nav{
            display: flex;
            border-bottom: 1px solid orangered;
            /*定义弹性 设置下划线*/
        }


        /*将导航放在主轴的任意位置上*/
        /*nav {*/
        /*    justify-content: flex-start;*/
        /*}*/

        /*!*nav {*!*/
        /*!*    justify-content: flex-end;*!*/
        /*!*}*!*/

        nav {
            justify-content: center;
        }
    </style>
</head>
<body>
<!--      定义导航链接部分 <nav>标签增强语义-->
    <nav>
        <a href="">我的京东</a>
        <a href="">购物车</a>
        <a href="">嗨购双十一</a>
        <a href="">在线客服</a>
    </nav>
</body>
</html>

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九、弹性元素在垂直方向(交叉轴)上的对齐方式

9.png


实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹性元素在垂直方向(交叉轴)上的对齐方式</title>
    <style>
        /*弹性容器通用样式*/
        .container {
            border: 2px dashed red;
            margin: 15px;
            background: #cdc;
        }
        /*弹性元素通用样式*/
        .item {
            box-sizing: border-box;
            border: 1px solid;
            padding: 20px;
            background: #ede;
        }
        /*块级弹性容器*/
        .flex {
            display: flex;
        }

        .container {
            width: 550px;
            height: 300px;
        }

        /*允许换行*/
        .wrap {
            flex-wrap: wrap;
        }

        /*单行容器 */

        /*1. 单行自动拉伸*/
        .stretch {
            align-items: stretch;

        }

        /*2. 单行起点对齐*/
        .flex-start {
            align-items: flex-start;
        }

        /*3. 单行终点对齐*/
        .flex-end {
            align-items: flex-end;
        }

        /*4. 单行居中对齐*/
        .center {
            align-items: center;
        }


        /*多行容器*/

        /*1. 多行自动拉伸*/
        .wrap-stretch {
            /*每一行的对齐方式*/
            align-content: stretch;
        }

        /*2. 多行起点对齐*/
        .wrap-flex-start {
            align-content: flex-start;
        }

        /*3. 多行终点对齐*/
        .wrap-flex-end {
            align-content: flex-end;
        }

        /* 4. 多行居中对齐 */
        .wrap-center {
            align-content: center;
        }

        /*5. space-between*/
        .wrap-space-between {
            align-content: space-between;
        }

        /*6. space-around*/
        .wrap-space-around {
            align-content: space-around;
        }

        /*7. space-evenly*/
        .wrap-space-evenly {
            align-content: space-evenly;
        }

        /*实战: 元素的水平垂直全部平均对齐*/
        .all-align {
            justify-content: space-around;
            align-content: space-around;
        }
    </style>
</head>
<body>
<h2>弹性元素在垂直轴上分布方式:</h2>
<h3>1 stretch: 默认值, 元素高度自动拉伸充满整个容器</h3>
<p>单行容器:</p>
<div class="container flex stretch">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
</div>
<p>多行容器:</p>
<div class="container flex wrap wrap-stretch">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>2 flex-start: 元素紧贴容器起点</h3>
<p>单行容器:</p>
<div class="container flex flex-start">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
</div>
<p>多行容器:</p>
<div class="container flex wrap wrap-flex-start">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>3 flex-end: 元素紧贴容器终点</h3>
<p>单行容器:</p>
<div class="container flex flex-end">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
</div>
<p>多行容器:</p>
<div class="container flex wrap wrap-flex-end">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>4 center: 元素中点与垂直轴中点对齐, 居中显示</h3>
<p>单行容器:</p>
<div class="container flex center">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
</div>
<p>多行容器:</p>
<div class="container flex wrap wrap-center">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
</div>

<hr style="height: 3px; background:green;">

<h3>5 垂直方向首尾行紧贴起止点,其它行平分剩余空间</h3>
<div class="container flex wrap wrap-space-between">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
</div>

<hr style="height: 3px; background:green;">

<h3>6 每个元素二边空间相等,相邻元素空间累加</h3>
<div class="container flex wrap wrap-space-around">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
</div>

<hr style="height: 3px; background:green;">

<h3>7. 每个元素, 以及元素到与起止点的空间全部相等</h3>
<div class="container flex wrap wrap-space-evenly">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
</div>

<hr style="height: 3px; background:green;">

<h3>8 小案例: 结合主轴, 实现空间全部平均分配</h3>
<div class="container flex wrap wrap-space-evenly all-align">
    <span class="item">item1</span>
    <span class="item">item2</span>
    <span class="item">item3</span>
    <span class="item">item4</span>
    <span class="item">item5</span>
    <span class="item">item6</span>
    <span class="item">item7</span>
    <span class="item">item8</span>
    <span class="item">item9</span>
    <span class="item">item10</span>
</div>
</body>
</html>

运行实例 »

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总结:

     了解了弹性盒子的基本布局与属性 还有主轴与交叉轴的排列顺序与规律    是移动端PC端的好朋友 简洁好用易懂省事!

手抄:

1572954687775212.jpg

1572954737217563.jpg



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