Flex最后一行左对齐

news2024/10/5 16:30:42

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Flex最后一行左对齐</title>
    <style>
      body {
        height: 1000px;
      }
      .container {
        float: left;
        border: 1px solid #000;
        display: flex;
        width: 290px;
        flex-wrap: wrap;
        justify-content: space-between;
        resize: both;
      }
      .list {
        width: 65px;
        height: 65px;
        margin-bottom: 10px;
        background-color: rgb(148, 148, 131);
        margin-right: 10px;
      }
      .list:nth-child(4n) {
        margin-right: 0px;
      }
      .container::after {
        content: '';
        display: block;
        flex: 1 1 auto;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
      <div class="list"></div>
    </div>
    <div>
      切换子项目数量
      <select id="select">
        <option value="9">9</option>
        <option value="10">10</option>
        <option value="11">11</option>
        <option value="12">12</option>
        <option value="13">13</option>
      </selction>
    </div>
    <script>
      let container = document.querySelector('.container');
      let box = document.querySelector('#select')

      box.onchange = (e) => {
        let len = e.target.value;
        let html = Array.from({length: len}, () => `<div class="list"></div>`).reduce((pre, item) => {
          return pre += item;
        }, '');
        container.innerHTML = html;
      }
    </script>
  </body>
</html>