前端拖拽

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .main {
      display: flex;
      justify-content:space-around;
    }
    .left {
      width: 300px;
      height: 500px;
      border: 1px solid lightseagreen;
      margin-right: 10px;
      /* background-color: green; */
    }
    .right {
      width: 300px;
      height: 500px;
      border: 1px solid lightseagreen;
      text-align: center;
      padding: 1px;
      /* background: red; */
    }
    .txt {
      border: 1px solid gray;
      margin: 1px;
      padding: 5px;
      cursor: move;
    }
  </style>
</head>
<body>
  <main class="main">
    <div class="left" id="left">
      <div class="txt-show">左边区域</div>
      <div class="dargable txt" id="txt1" draggable="true">可移动的文字一</div>
      <div class="dargable txt" id="txt2" draggable="true">可移动的文字二</div>
      <div class="dargable txt" id="txt3" draggable="true">可移动的文字三</div>
      <div class="dargable txt" id="txt4" draggable="true">可移动的文字四</div>
      <div class="dargable txt" id="txt5" draggable="true">可移动的文字五</div>
    </div>
    <div class="right" id="right">
      <div class="txt-show">右边区域</div>
    </div>
  </main>
  <script>
  let left = document.getElementById('left')
  let target = document.getElementById('right')
  left.addEventListener('dragstart', (event) => {
    event.dataTransfer.setData('Text', target.id)
    console.log('drag开始拖动啦1');
  })
  target.addEventListener('dragstart', (event) => {
    const target = event.target; 
    event.dataTransfer.setData('Text', target.id)
  })
  left.addEventListener('drag', (event) => {
    console.log('drag正在拖啦2');
  })
  left.addEventListener('dragend', (event) => {
    console.log('dragend拖动结束啦7');
  })
  target.addEventListener('dragenter', (event) => {
    console.log('dragenter进入区域啦3')
  })
  target.addEventListener('dragover', (event) => {
    event.preventDefault();
    console.log('dragover在区域内拖动啦4')
  })
  left.addEventListener('dragover', (event) => {
    event.preventDefault();
  })
  target.addEventListener('dragleave', (event) => {
    console.log('dragleave离开拖动区域啦5')
  })
  target.addEventListener('drop', (event) => {
    let drag_id = event.dataTransfer.getData('text')
    target.appendChild(document.getElementById(drag_id))
  })
  left.addEventListener('drop', (event) => {
    let drag_id = event.dataTransfer.getData('text')
    left.appendChild(document.getElementById(drag_id))
  })
  </script>
</body>
</html>