探究flex-basis

flex-basis属性定义了在分配多余空间之前，项目占据的主轴空间（main size）。
浏览器根据这个属性，计算主轴是否有多余空间。它的默认值为auto，即项目的本来大小。

在这里插入图片描述

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
   .wrap {
    
    
    display: flex;
    width: 500px;
    height: 70px;
    border: 1px solid #ccc;
   }
   .i {
    
    
    flex-basis: 20px;
    width: 150px;
    background-color: aqua;
   }
   .ii {
    
    
    flex-basis: 50px;
    background-color: bisque;
   }
   .iii {
    
    
    flex-basis: auto;  /*默认值为auto 也就是已项目本来的大小为准*/
    width: 100px;
    background-color: blueviolet;
   }
  </style>
</head>
<body>
  <div class="wrap">
    <div class="i"></div>
    <div class="ii"></div>
    <div class="iii"></div>
  </div>
</body>
</html>

在这里插入图片描述

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
   .wrap {
    
    
    display: flex;
    flex-direction: column;
    width: 40px;
    height: 700px;
    border: 1px solid #ccc;
   }
   .i {
    
    
    flex-basis: 20px;
    height: 90px;
    width: 150px;
    background-color: aqua;
   }
   .ii {
    
    
    flex-basis: 50px;
    background-color: bisque;
   }
   .iii {
    
    
    flex-basis: auto;  /*当主轴的方向变换，其实flex-basis 也就是指的是高度了*/
    width: 100px;
    height: 300px;
    background-color: blueviolet;
   }
  </style>
</head>
<body>
  <div class="wrap">
    <div class="i"></div>
    <div class="ii"></div>
    <div class="iii"></div>
  </div>
</body>
</html>

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