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flex学习总结(3)项目属性——2019年9月10号20:00分
虎子爸爸
Original
499 people have browsed it

效果如图:

flex-70.png

代码如下:

实例

<!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>flex项目属性</title>
</head>

<body>
    <style>
        .container {
            width: 80%;
            height: 600px;
            border: 1px solid cadetblue;
            margin: 20px auto;
            /* 把这个容器变成弹性盒子 */
            display: flex;
        }
        
        h5,
        h4,
        h6 {
            margin: 10px auto;
            text-align: center;
        }
        
        .container div,
        .container span {
            width: 100px;
            height: 100px;
            border: 1px solid crimson;
            margin: 10px;
            text-align: center;
            line-height: 30px;
            font-size: 12px;
        }
        
        .container-a div:nth-of-type(2) {
            /* order: integer; */
            /* order,定义弹性盒子里面某一个项目的排序位置,一般都是默认0,同时根据 */
            order: -1;
            flex-grow: 2;
        }
        
        .container-a div:nth-of-type(3) {
            flex-grow: 10;
        }
        
        .container-a div:nth-of-type(1) {
            flex-shrink: 10;
        }
        
        .container-a span:nth-of-type(1) {
            flex-basis: 150px;
        }
        
        .container-a span:nth-of-type(2) {
            flex: 1 1 150px;
        }
        
        .container-a span:nth-of-type(3) {
            align-self: center;
            border: 5px solid chocolate;
        }
    </style>
    <h5>flex弹性盒子里面的项目属性</h5>
    <div class="container container-a">
        <span>版块s-a-flex-basis: 150px;</span>
        <span>版块s-b-flex: 1 1 150px;</span>
        <span>版块s-c:align-self: center;</span>
        <div>版块div-a-flex-shrink: 10;</div>
        <div>版块div-b-order: -1; flex-grow: 2;</div>
        <div>版块div-c-flex-grow: 10;</div>
    </div>

    <dl>order——定义弹性盒子里面某一个项目的排序位置,一般盒子里面所有的项目序号都是0,是根据项目本身的顺序来排序。</dl>
    <dd>1.假如某一个项目的order:1,那么,它并不是第一位,它将是最后一位,因为其他的都是0</dd>
    <dd>2.假如想让一个项目排在最前面,在其他项目order不变的情况下,这个项目的order:-1,这样设置才对</dd>
    <ul>
        <li>
            flex-grow---弹性盒子里面某个项目的放大比例
            <ol>

                <li>flex-grow:盒子容器里面的项目一般都默认为1,就是的原比例,不缩放。</li>

                <li>flex-grow:2,该项目的所占宽度增加到默认不缩放值的2倍。</li>
                <li>但是,flex-grow:10,当容器扩大时,该项目的宽度并不一定会增加到10倍。</li>
            </ol>

        </li>
        <li>
            flex-shrink——当外面的弹性盒子容器缩小时,里面某个项目的缩写比例。
            <ol>
                <li>flex-shrink:1;默认的比例</li>
                <li>flex-shrink:2,相对于容器内的其他项目宽度缩小两倍;</li>
                <li>注意1:这个flex-shrink项目属性和上面的flex-grow属性都有个共同点,就是都必须在外盒子容器的宽度发生变化时才会发生变化。</li>
                <li>注意2:当盒子容器宽度变大时:flex-grow才有效;当盒子容器宽度变小时,flex-shrink才有效;</li>
            </ol>
        </li>
        <li>
            flex-basis---定义盒子容器里面某个项目的宽度
            <ol>
                <li>flex-basis:auto;默认自动</li>
                <li>flex-basis:300px;宽度设定为300px,</li>
                <li>注意:这是其他容器内的项目标准宽度时,该项目的宽度。随着容器宽度的变化,该项目宽度仍然会变化。</li>
            </ol>

        </li>
        <li>
            flex——简写
            <ol>
                <li>flex:1,1,200px;</li>
                <li>flex:flex-grow,flex-shrink,flex-basis;</li>
                <li>flex:none;===flex:0,0,auto;</li>
                <li>flex:auto;===flex:1,1,auto;</li>
            </ol>
        </li>
        <li>
            align-self:容器内某个项目的对齐方式
            <ol>
                <li>align-self:flex-start;向左对齐</li>
                <li>注意:align-self:center;是该项目在容器内原有位置上的左右居中,并不是完全在容器内居中。</li>

            </ol>
        </li>
    </ul>




</body>

</html>

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