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  • 移动Web开发必备基础(flex容器属性)

    box-sizing

    在pc端一般使用默认值  content-box

    在移动端一般使用 border-box

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <style>
            .parent{width:100%;}
            .child{width:50%;height:30px;float:left;}
            .parent .child{background-color: pink;border:1px solid #333;box-sizing:content-box;}
            .parent2 .child{background-color: #abcdef;border:1px solid #333;box-sizing:border-box;}
        </style>
    </head>
    <body>
        <div class="parent">
            <div class="child"></div>
            <div class="child"></div>
        </div>
        <div class="parent2">
            <div class="child"></div>
            <div class="child"></div>
        </div>
        <script>
    
        </script>
    </body>
    </html>

    移动端通用写法:

    *{margin:0;padding:0;box-sizing:border-box;}

    图标字体:

    阿里巴巴矢量图标库 https://www.iconfont.cn/

    选中图标后添加至项目,然后下载至本地

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <link rel="stylesheet" href="font/iconfont.css">
        <style>
            *{margin:0;padding:0;box-sizing:border-box;}
            .iconfont{font-size:30px;}
            .icon-gouwuche{color:rgb(234,58,67);}
            .icon-file{color:rgb(244,189,0);}
            .icon-saomiao{color:rgb(42,83,205)}
            .icon-xialajiantou{color:rgb(85,85,85);}
        </style>
    </head>
    <body>
        <div class="parent">
            <i class="iconfont icon-gouwuche"></i>
            <i class="iconfont icon-file"></i>
            <i class="iconfont icon-saomiao"></i>
            <i class="iconfont icon-xialajiantou"></i>
        </div>
        </div>
        <script>
    
        </script>
    </body>
    </html>

    flex布局

    弹性布局 弹性盒子布局

    flex容器(flex container):父元素 display:flex |  inline-flex;

    flex项目(flex item):子元素(不包括孙子元素)

    flex容器的属性:

    div元素默认是块元素,垂直排列

    使用flex或者inline-flex布局之后,会自动水平排列

    在没有设置容器宽度的情况下,flex的宽度是100%,而inline-flex的宽度取决于项目总宽度

    在设置容器宽度的情况下,二者的容器宽度相同

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <link rel="stylesheet" href="font/iconfont.css">
        <style>
            *{margin:0;padding:0;box-sizing:border-box;}
            .child{width:100px;height:100px;background:orange;border:1px solid #333;margin:2px;}
            .parent{background:#abcdef;}
            .parent1{display: flex;}
            .parent2{display: inline-flex;}
        </style>
    </head>
    <body>
        <div class="parent parent1">
            <div class="child"></div>
            <div class="child"></div>
            <div class="child"></div>
            <div class="child"></div>
        </div>
        <div class="parent parent2">
            <div class="child"></div>
            <div class="child"></div>
            <div class="child"></div>
            <div class="child"></div>
        </div>
    
    </body>
    </html>

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <link rel="stylesheet" href="font/iconfont.css">
        <style>
            *{margin:0;padding:0;box-sizing:border-box;}
            .child{width:100px;height:100px;background:orange;border:1px solid #333;margin:2px;}
            .parent{background:#abcdef;width:100%;}
            .parent1{display: flex;}
            .parent2{display: inline-flex;}
        </style>
    </head>
    <body>
        <div class="parent parent1">
            <div class="child"></div>
            <div class="child"></div>
            <div class="child"></div>
            <div class="child"></div>
        </div>
        <div class="parent parent2">
            <div class="child"></div>
            <div class="child"></div>
            <div class="child"></div>
            <div class="child"></div>
        </div>
    
    </body>
    </html>

    flex-direction 决定主轴方向

    row 默认水平轴为主轴,左边开始右边结束

    row-reverse 水平轴为主轴,右边开始左边结束

    column 垂直轴为主轴,上边开始下边结束

    column-reverse 垂直轴为主轴,下边开始上边结束

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <link rel="stylesheet" href="font/iconfont.css">
        <style>
            *{margin:0;padding:0;box-sizing:border-box;}
            .child{width:100px;height:100px;background:orange;border:1px solid #333;margin:2px;}
            .parent{background:#abcdef;display: flex;}
            .parent1{flex-direction:row;}
            .parent2{flex-direction:row-reverse;}
            .parent3{flex-direction:column;}
            .parent4{flex-direction:column-reverse;}
        </style>
    </head>
    <body>
        <div class="parent parent1">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent2">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent3">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent4">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
    
    </body>
    </html>

     

     

     

    flex-wrap 一行排不下时是否换行

    nowrap 不换行,进行压缩(默认值)

    wrap 换行

    wrap-reverse 换行的排在前面

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <link rel="stylesheet" href="font/iconfont.css">
        <style>
            *{margin:0;padding:0;box-sizing:border-box;}
            .child{width:100px;height:100px;background:orange;border:1px solid #333;margin:2px;}
            .parent{background:#abcdef;display: flex;}
            .parent1{flex-wrap:nowrap;}
            .parent2{flex-wrap:wrap;}
            .parent3{flex-wrap:wrap-reverse;}
        </style>
    </head>
    <body>
        <div class="parent parent1">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
            <div class="child">9</div>
            <div class="child">10</div>
            <div class="child">11</div>
            <div class="child">12</div>
        </div>
        <div class="parent parent2">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
            <div class="child">9</div>
            <div class="child">10</div>
            <div class="child">11</div>
            <div class="child">12</div>
        </div>
        <div class="parent parent3">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
            <div class="child">9</div>
            <div class="child">10</div>
            <div class="child">11</div>
            <div class="child">12</div>
        </div>
    
    </body>
    </html>

     

     

    flex-flow 是flex-direction和flex-wrap的简写

    如:flex-flow:row wrap;

    justify-content 项目在主轴上的对齐方式

    flex-start 整体左对齐

    flex-end 整体右对齐

    center 整体居中对齐

    space-between 两端对齐

    space-around 每个项目的左右间距相等(项目之间的间距是项目与边框的间距的2倍)

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <link rel="stylesheet" href="font/iconfont.css">
        <style>
            *{margin:0;padding:0;box-sizing:border-box;}
            .child{width:100px;height:100px;background:orange;border:1px solid #333;margin:2px;}
            .parent{background:#abcdef;display: flex;}
            .parent1{justify-content:flex-start;}
            .parent2{justify-content:flex-end;}
            .parent3{justify-content:center;}
            .parent4{justify-content:space-between;}
            .parent5{justify-content:space-around;}
        </style>
    </head>
    <body>
        <div class="parent parent1">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent2">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent3">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent4">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent5">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
    
    </body>
    </html>

     

     

     

     

    align-items 在交叉轴上的排列方式

    flex-start 上边对齐

    flex-end 下边对齐

    center 居中对齐

    baseline 基线对齐

    stretch 默认值,如果项目没有设置高度,或者高度设置为auto,则默认占满整个容器

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <link rel="stylesheet" href="font/iconfont.css">
        <style>
            *{margin:0;padding:0;box-sizing:border-box;}
            .child{width:100px;height:100px;background:orange;border:1px solid #333;margin:2px;}
            .parent{background:#abcdef;display: flex;}
            .parent .child:nth-child(even){height:130px;}
            .parent1{align-items:flex-start;}
            .parent2{align-items:flex-end;}
            .parent3{align-items:center;}
            .parent4{align-items:baseline;}
            .parent5 .child{height:auto;}
            .parent5{align-items:stretch;}
        </style>
    </head>
    <body>
        <div class="parent parent1">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent2">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent3">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent4">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
        <div class="parent parent5">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
        </div>
    
    </body>
    </html>

     

     

     

     

    align-content 交叉轴的对齐方式(针对多行,如果单行是不起作用的)

    将所有项目看成一个整体

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
        <title>Document</title>
        <link rel="stylesheet" href="font/iconfont.css">
        <style>
            *{margin:0;padding:0;box-sizing:border-box;}
            .child{width:100px;height:100px;background:orange;border:1px solid #333;margin:2px;}
            .parent{background:#abcdef;display: flex;flex-wrap:wrap;height:300px;border:1px solid;}
            .parent1{align-content:flex-start;}
            .parent2{align-content:flex-end;}
            .parent3{align-content:center;}
            .parent4{align-content:space-between;}
            .parent5{align-content:space-around;}
            .parent6 .child{height:auto;}
            .parent6{align-content:stretch;}
        </style>
    </head>
    <body>
        <div class="parent parent1">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
        </div>
        <div class="parent parent2">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
        </div>
        <div class="parent parent3">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
        </div>
        <div class="parent parent4">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
        </div>
        <div class="parent parent5">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
        </div>
        <div class="parent parent6">
            <div class="child">1</div>
            <div class="child">2</div>
            <div class="child">3</div>
            <div class="child">4</div>
            <div class="child">5</div>
            <div class="child">6</div>
            <div class="child">7</div>
            <div class="child">8</div>
        </div>
    
    </body>
    </html>

     

     

     

     

     

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  • 原文地址:https://www.cnblogs.com/chenyingying0/p/12492285.html
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