前端vue中的拖拽知识详解

<div draggable="true">我是可拖动的</div>

dragClass.addEventListener("dragstart", (e) => {
  const node = e.target.cloneNode(true);
  e.dataTransfer.setData("cloneNode", node.outerHTML);
});

dragClass.addEventListener("dragend", (e) => {
  e.dataTransfer.clearData();
});

dropDom.addEventListener("dragover", (e) => {
  if (e.target.className == "draggable") {
    e.preventDefault();
  }
});

dropDom.addEventListener("drop", (e) => {
  e.preventDefault();
  const node = e.dataTransfer.getData("cloneNode");
  e.target.innerHTML = node;
  const originCellNode = e.dataTransfer.getData("text/html");
  if (originCellNode) {
    originCellNode.removeChild(originCellNode);
  }
  e.dataTransfer.clearData("cloneNode");
});

dragTableCell.addEventListener("dragstart", (e) => {
  const node = e.target.cloneNode(true);
  e.dataTransfer.setData("cloneNode", node.outerHTML);
  e.dataTransfer.setData("text/html", e.target.parentNode.outerHTML);
});

export const drag = {
  mounted(el) {
    el.style.position = "absolute";
    el.style.cursor = "move";

    let startX, startY, initialX, initialY;

    const dragStart = (e) => {
      startX = e.clientX;
      startY = e.clientY;
      initialX = el.offsetLeft;
      initialY = el.offsetTop;

      document.addEventListener("mousemove", dragMove);
      document.addEventListener("mouseup", dragEnd);
    };

    const dragMove = (e) => {
      const dx = e.clientX - startX;
      const dy = e.clientY - startY;
      const newX = initialX + dx;
      const newY = initialY + dy;

      const maxX = window.innerWidth - el.offsetWidth;
      const maxY = window.innerHeight - el.offsetHeight;

      /**边界检查 */
      el.style.left = `${Math.min(Math.max(newX, 0), maxX)}px`;
      el.style.top = `${Math.min(Math.max(newY, 0), maxY)}px`;
    };

    const dragEnd = () => {
      document.removeEventListener("mousemove", dragMove);
      document.removeEventListener("mouseup", dragEnd);
    };

    el.addEventListener("mousedown", dragStart);
  },
};