flex-basic##如果不使用box-sizing来改变盒模型的话，那么这个属性就决定了flex元素的内容盒（con

##如果不使用box-sizing来改变盒模型的话，那么这个属性就决定了flex元素的内容盒（content-box）的宽或者高（取决于主轴方向）的尺寸大小


<!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>Document</title>
    <style>
        .container {
            display: flex;
        }

        .flex1 {
            background: red;
            flex: auto;
        }

        .flex2 {
            background: pink;
        }

        .flex3 {
            background: tan;
        }

        .flex4 {
            background: khaki;
        }

        .flex5 {
            background: forestgreen;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="flex flex1">1: flex-basis test</div>
        <div class="flex flex2">2: flex-basis test</div>
        <div class="flex flex3">3: flex-basis test</div>
        <div class="flex flex4">4: flex-basis test</div>
        <div class="flex flex5">5: flex-basis test</div>
        </ul>
</body>

</html>