flex: 0 1 auto的含义大家都说的很清楚，查了一些资料补充一下以下两种情况的子元素在分配主轴空间上的计算方式

主轴空间宽度有剩余，子元素最终的宽度？

<div class="parent">
    <div class="item-1"></div>
    <div class="item-2"></div>
    <div class="item-3"></div>
</div>

<style type="text/css">
    .parent {
        display: flex;
        width: 600px;
    }
    .parent > div {
        height: 100px;
    }
    .item-1 {
        width: 140px;
        flex: 2 1 0%;
        background: blue;
    }
    .item-2 {
        width: 100px;
        flex: 2 1 auto;
        background: darkblue;
    }
    .item-3 {
        flex: 1 1 200px;
        background: lightblue;
    }
</style>

主轴空间宽度不足，子元素最终的宽度？

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div class="container">
    <div class="left"></div>
    <div class="right"></div>
  </div>
  <style>
    * {
      padding: 0;
      margin: 0;
    }
    .container {
      width: 600px;
      height: 300px;
      display: flex;
    }
    .left {
      /* 285 */
      flex: 1 2 500px;  
      background: red;
    }
    .right {
      /* 314 */
      flex: 2 1 400px;
      background: blue;
    }
  </style>
</body>
  1. 总权重  500 * 2 + 400 * 1 = 1400 <br />
  2. 需要缩小的宽度 <br />
    left (500 * 2 / 1400) * 300 = 214.285714286<br />
    right (400 * 1 / 1400) * 300 = 85.714285714<br />
  3. 最后的宽度<br />
    left 500 - 214.285714286 = 285.714285714<br />
    right 400 - 85.714285714 = 314.285714286  <br />
</html>

第 154 题：弹性盒子中 flex: 0 1 auto 表示什么意思 #380

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