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<head>
  <style>
    .square {
      width: 50px;
      height: 50px;
      background-color: blue;
    }
  </style>
</head>
<body>
  <div class="square"></div>
  <script>
    let dragEl = null;
    function createDragEl (clientX, clientY) {
      console.log(clientX, clientY)
      // 创建一个DIV元素
      const dragItem = document.createElement('div');
      dragItem.className = "dragEl"
      dragItem.style.width = '50px';
      dragItem.style.height = '50px';
      dragItem.style.backgroundColor = 'blue';
      dragItem.style.position = 'absolute';
      dragItem.style.top = clientY - 25 + "px";
      dragItem.style.left = clientX - 25 + "px";
      dragItem.style.zIndex = 999;
      // 将元素添加到文档中
      document.body.appendChild(dragItem);
      dragEl = dragItem;

      // 拖拽逻辑
      dragItem.addEventListener('mousedown', function(e) {
        const offsetX = e.clientX - dragItem.getBoundingClientRect().left;
        const offsetY = e.clientY - dragItem.getBoundingClientRect().top;

        function drag(e) {
          dragItem.style.position = 'absolute';
          dragItem.style.left = (e.clientX - offsetX) + 'px';
          dragItem.style.top = (e.clientY - offsetY) + 'px';
        }

        function stopDrag() {
          document.removeEventListener('mousemove', drag);
          document.removeEventListener('mouseup', stopDrag);
        }

        document.addEventListener('mousemove', drag);
        document.addEventListener('mouseup', stopDrag);
      });
    }
    const el = document.querySelector(".square");
    el.addEventListener("mousedown", function (e) {
      createDragEl(e.clientX, e.clientY);
    });
    document.addEventListener("mousemove", function (e) {
      if (!dragEl)return;
      dragEl.style.top = e.clientY - 25 + "px";
      dragEl.style.left = e.clientX - 25 + "px";
    });
    document.addEventListener("mouseup", function (e) {
      if(!dragEl)return;
      dragEl = null;
    });
  </script>
</body>

最后更新： 2024年03月25日 17:05