responsive-child-element
/
index.html

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>元素自适应容器</title>
    <style>
      body {
        text-align: center;
        font-size: 18px;
        padding-top: 2vh;
      }

      .responsive-ref1,
      .responsive-ref2 {
        width: 40vw;
        height: 50vh;
        border: 1px solid;
        padding: 20px;
        margin: 40px 0 20px 0;
        box-sizing: border-box;
      }

      .responsive-ref1 {
        margin-right: 20px;
        display: inline-block;
        vertical-align: top;
        position: relative;
      }

      .responsive-ref2 {
        position: static;
        vertical-align: top;
        display: inline-flex;
        align-items: center;
        justify-content: center;
      }

      .flex1,
      .flex2 {
        flex: 0 0 auto;
        width: 300px;
        display: flex;
        flex-flow: row wrap;
        gap: 15px;
      }

      .item {
        flex: 0 0 auto;
        width: 90px;
        height: 50px;
        line-height: 50px;
        text-align: center;
        border: 1px solid;
        box-sizing: border-box;
        font-size: 16px;
        cursor: pointer;
      }

      .item:hover {
        font-size: 26px;
        background-color: antiquewhite;
      }
    </style>
  </head>
  <body>
    <h1>元素尺寸自适应容器</h1>
    <p>
      核心思路：根据元素和其参照节点的宽高计算出合适的缩放比例（计算逻辑与
      <a
        href="https://developer.mozilla.org/zh-CN/docs/Web/CSS/object-fit"
        target="_blank"
      >
        object-fit:contain </a
      >一样），然后缩放目标元素
    </p>
    <p>下面两个容器盒子的宽高单位分别使用vw和vh，缩放浏览器窗口可以查看效果</p>
    <p>
      左边的盒子使用transform进行缩放（建议使用），右边的盒子通过修改目标DOM树中所有节点的属性进行缩放
    </p>
    <div class="responsive-ref1">
      <p></p>
      <div class="flex1">
        <div class="item">1</div>
        <div class="item">2</div>
        <div class="item">3</div>
        <div class="item">4</div>
        <div class="item">5</div>
        <div class="item">6</div>
        <div class="item">7</div>
        <div class="item">8</div>
        <div class="item">9</div>
      </div>
    </div>

    <div class="responsive-ref2">
      <div class="flex2">
        <div class="item">1</div>
        <div class="item">2</div>
        <div class="item">3</div>
        <div class="item">4</div>
        <div class="item">5</div>
        <div class="item">6</div>
        <div class="item">7</div>
        <div class="item">8</div>
        <div class="item">9</div>
      </div>
    </div>

    <script src="./responsive1.js"></script>
    <script src="./responsive2.js"></script>
  </body>
</html>