我只是想用一类搜索音频将一个 div 与幻灯片类包裹在每 3 个 div 周围。

我遇到的一个错误是它说 elem.parentElement 未定义...

所以这部分效果很好......

const audioBlocks = document.querySelectorAll('.search-audio');
const slider = document.querySelector('.slider');
const audioBlockArr = Array.from(audioBlocks);

function groupBlocks(arr, len) {

    let groups = [],
        i = 0,
        n = arr.length;
  
    while (i < n) {
      groups.push(arr.slice(i, i += len));
    }
  
    return groups;
  }

newArr = [...groupBlocks(audioBlockArr, 3)];

问题就在这里 - 将一个 div 包裹在新的分组元素数组周围。

let wrap = (array) => {
  
  array.forEach((elem) => {
    let div = document.createElement('div');
    div.classList.add('slide');
    div.innerHTML = '';

    elem.parentElement.insertBefore(div, elem);
    div.appendChild(elem);
  });
}

wrap(newArr);

完整代码：

const audioBlocks = document.querySelectorAll('.search-audio');
const slider = document.querySelector('.slider');
const audioBlockArr = Array.from(audioBlocks);

function groupBlocks(arr, len) {

  let groups = [],
    i = 0,
    n = arr.length;

  while (i < n) {
    groups.push(arr.slice(i, i += len));
  }

  return groups;
}

newArr = [...groupBlocks(audioBlockArr, 3)];

let wrap = (array) => {
  array.forEach((elem) => {
    let div = document.createElement('div');
    div.classList.add('slide');
    div.innerHTML = '';

    elem.parentElement.insertBefore(div, elem);
    div.appendChild(elem);
  });
}

wrap(newArr);

body {
  font-family: system-ui;
  background: #f06d06;
  color: white;
  text-align: center;
}

.search-audio {
  height: 12rem;
  width: 12rem;
  background: rgb(255, 153, 0);
  margin: .5rem;
  display: inline-block;
}

.slide {
  background-color: #555;
}