js 左侧多个拖拽内容，拖拽其中一个dom到右侧，右侧dom判断拖拽到dom内，未释放前可进行排序，右侧dom可拖拽排序，请用完整代码实现

好的，以下是一个完整的实现示例：

HTML：

<div class="left">
  <div class="item" draggable="true">拖拽内容1</div>
  <div class="item" draggable="true">拖拽内容2</div>
  <div class="item" draggable="true">拖拽内容3</div>
</div>

<div class="right">
  <div class="dropzone">拖拽到这里</div>
</div>

CSS：

.left {
  float: left;
  width: 50%;
  height: 200px;
  border: 1px solid #ccc;
  padding: 10px;
  box-sizing: border-box;
}

.right {
  float: left;
  width: 50%;
  height: 200px;
  border: 1px solid #ccc;
  padding: 10px;
  box-sizing: border-box;
}

.item {
  background-color: #f8f8f8;
  border: 1px solid #ccc;
  padding: 5px;
  margin-bottom: 5px;
  cursor: move;
}

.dropzone {
  background-color: #f8f8f8;
  border: 1px dashed #ccc;
  text-align: center;
  line-height: 200px;
  cursor: pointer;
}

JavaScript：

const left = document.querySelector('.left');
const right = document.querySelector('.right');
const dropzone = document.querySelector('.dropzone');

let draggingItem = null;
let draggingItemIndex = -1;
let isDraggingFromLeft = false;

// 左侧拖拽事件处理函数
function dragStart(e) {
  draggingItem = this;
  draggingItemIndex = Array.from(this.parentNode.children).indexOf(this);
  isDraggingFromLeft = true;
  e.dataTransfer.effectAllowed = 'move';
  e.dataTransfer.setData('text/html', this.outerHTML);
  this.classList.add('dragging');
}

function dragEnd() {
  draggingItem = null;
  draggingItemIndex = -1;
  isDraggingFromLeft = false;
  this.classList.remove('dragging');
}

// 右侧拖拽事件处理函数
function dragOver(e) {
  e.preventDefault();
  e.dataTransfer.dropEffect = 'move';
  this.classList.add('over');
}

function dragLeave() {
  this.classList.remove('over');
}

function drop(e) {
  e.preventDefault();
  const item = document.createElement('div');
  item.classList.add('item');
  item.draggable = true;
  item.innerHTML = e.dataTransfer.getData('text/html');
  this.parentNode.insertBefore(item, this);
  const dropzoneItems = Array.from(this.parentNode.children);
  const itemIndex = dropzoneItems.indexOf(item);
  const draggingItemElement = dropzoneItems[draggingItemIndex];
  if (isDraggingFromLeft) {
    draggingItemElement.parentNode.removeChild(draggingItemElement);
  }
  if (draggingItem !== item) {
    if (itemIndex > draggingItemIndex) {
      draggingItemElement.parentNode.insertBefore(draggingItemElement, item.nextSibling);
    } else {
      draggingItemElement.parentNode.insertBefore(draggingItemElement, item);
    }
  }
  this.classList.remove('over');
}

// 左侧拖拽事件监听器
const items = document.querySelectorAll('.left .item');
items.forEach(item => {
  item.addEventListener('dragstart', dragStart);
  item.addEventListener('dragend', dragEnd);
});

// 右侧拖拽事件监听器
dropzone.addEventListener('dragover', dragOver);
dropzone.addEventListener('dragleave', dragLeave);
dropzone.addEventListener('drop', drop);

这个实现示例可以让左侧多个拖拽内容，拖拽其中一个DOM到右侧，右侧DOM判断拖拽到DOM内，未释放前可进行排序，右侧DOM可拖拽排序。