157、flex的三个值的含义和max-width、min-width

来源：https://www.cnblogs.com/beka/p/8574189.html

flex: flex-grow flex-shrink flex-basis;

flex-flow: flex-direction flex-wrap;

flex-wrap: wrap;//让弹性盒元素在必要的时候拆行

flex-basis 属性用于设置或检索弹性盒伸缩基准值。一个长度单位或者一个百分比，规定灵活项目的初始长度。

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

<head>
    <title></title>
    <style>
        .test {
            display: flex;
            display: -webkit-flex;
            justify-content: center;
            align-items: center;
            border: 1px solid red;
            box-sizing: border-box;
            overflow: hidden;
            width: 100%;
            height: 400px;

        }

        .top {
            border: 1px solid blue;
            -webkit-flex: 1 1 300px;
            -ms-flex: 1 1 300px;
            flex: 1 1 300px;
            width: 200px;
            height: 200px;
        }

        .main {
            border: 1px solid green;
            flex: 1 1 300px;
            width: 200px;
            height: 200px;
        }

        .bottom {
            border: 1px solid black;
            flex: 1 1 300px;
            width: 200px;
            height: 200px;
        }
    </style>

</head>

<body>
    <div class="test">
        <div class="top">头部</div>
        <div class="main">中间</div>
        <div class="bottom">底部</div>
    </div>
    <div>
        <p>flex: 1 1 300px;</p>
        <p>flex: 扩展比例 收缩比例 基准“宽”度;</p>
    </div>
</body>

</html>

<!DOCTYPE html>

<html lang="en">

<head>
    <title></title>

    <style>

    </style>
</head>

<body>
    <div style="width: 50px;border: 1px solid green;height:50px;">
        <div style="max-width: 100px;border: 3px solid gray;height:50px">

        </div>
    </div>
    <br/>
    <br/>
    <div style="width: 50px;border: 1px solid green;height:50px;">
        <div style="min-width: 100px;border: 3px solid gray;height:50px">

        </div>
    </div>
</body>

</html>