移动Web开发必备基础(flex项目属性)

前提:父容器设置了display:flex 或 inline-flex

 

order 项目的排列顺序

默认是0,数字越小,排在越前面

<!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;flex-wrap:wrap;height:300px;border:1px solid;}
        .child:nth-child(4){order:-1;}
    </style>
</head>
<body>
    <div class="parent">
        <div class="child">1</div>
        <div class="child">2</div>
        <div class="child">3</div>
        <div class="child">4</div>
    </div>

</body>
</html>

 

 

flex-grow 容器有多余空间时项目是否扩张

默认是0,都不扩张

如果都是1,则平分剩余空间

如果数字不一致,则按照比例平分剩余空间

没有设置flex-grow属性和已经明确设置过width属性的元素,不参与平分剩余空间

<!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 .child{flex-grow:1;}

        .parent2 .child{flex-grow:1;}
        .parent2 .child:last-child{flex-grow:3;}

        .parent3 .child:nth-child(1){flex-grow:1;}
        .parent3 .child:nth-child(2){flex-grow:1;}
        .parent3 .child:nth-child(3){flex-grow:1;}
    </style>
</head>
<body>
    <!-- 不平分空间 -->
    <div class="parent">
        <div class="child">1</div>
        <div class="child">2</div>
        <div class="child">3</div>
        <div class="child">4</div>
    </div>
    <!-- 等分空间 -->
    <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>
    <!-- 按比例等分空间 -->
    <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>
    <!-- 没有设置flex-grow则不参与 -->
    <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>

</body>
</html>

 

 

 

 

 

 

 

 

flex-shrink 空间不足时项目是否缩小

默认是1,将等比缩小

如果设置为0,则不参与缩小

负值无效

<!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;height:300px;border:1px solid;width:300px;}
        
        .parent1 .child{flex-shrink:0;}

        .parent2 .child{flex-shrink:1;}
        .parent2 .child:last-child{flex-shrink:0;}

    </style>
</head>
<body>
    <!-- 默认等比缩小 -->
    <div class="parent">
        <div class="child">1</div>
        <div class="child">2</div>
        <div class="child">3</div>
        <div class="child">4</div>
    </div>
    <!-- 全部不缩小 -->
    <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>
    <!-- 设置为0的不参与缩小 -->
    <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>

</body>
</html>

 

 

 

 

 

 

flex-basis 定义项目所占的主轴空间

auto 默认值

瓜分剩余空间时会先去除flex-basis中设置的固定值

当flex-basis和width属性同时存在时,width属性不生效

 

flex

是flex-grow  flex-shrink  flex-basis的简写,默认是 0 1 auto

如果要设置项目平分空间,建议设置 flex:1 这种简写方式

 

align-self 设置项目的交叉轴对齐方式,可覆盖父容器设置的align-items属性

auto 默认值,表示继承自父容器;如果没有父容器,则等同于stretch

<!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;height:300px;border:1px solid;align-items:center;}
        .parent .child:first-child{align-self:flex-start;}
        .parent .child:last-child{align-self:flex-end;}

    </style>
</head>
<body>
    <!-- 默认等比缩小 -->
    <div class="parent">
        <div class="child">1</div>
        <div class="child">2</div>
        <div class="child">3</div>
        <div class="child">4</div>
    </div>
</body>
</html>

 

posted @ 2020-03-14 16:29  陈莺莺呀  阅读(266)  评论(0编辑  收藏  举报