JavaScript实现多个元素的拖放功能-PHP中文网问答

我找到了这段代码，它可以让你在特定区域内拖放一个项目，但我无法重写它，以便允许多个元素拖放，因为我不知道如何从drop_handler函数中获取拖动对象的id。

let offsetX;
let offsetY;

onDragStart = function(ev) {
  const rect = ev.target.getBoundingClientRect();

  offsetX = ev.clientX - rect.x;
  offsetY = ev.clientY - rect.y;
};

drop_handler = function(ev) {
  ev.preventDefault();

  const left = parseInt(id2.style.left);
  const top = parseInt(id2.style.top);

  id1.style.position = 'absolute';
  id1.style.left = ev.clientX - left - offsetX + 'px';
  id1.style.top = ev.clientY - top - offsetY + 'px';
  id2.appendChild(document.getElementById("id1"));
};

dragover_handler = function(ev) {
  ev.preventDefault();
  ev.dataTransfer.dropEffect = "move";
};

<div id="id1" draggable="true" ondragstart="onDragStart(event)" style="border:2px solid green; cursor:pointer;width:100px;height:50px;">拖动的Div</div>


<div id="id2" style="position:absolute;left:200px;top:50px;border:2px solid red; cursor:pointer;width:200px;height:200px;" ondrop="drop_handler(event)" ondragover="dragover_handler(event)">放置的Div
</div>

let offsetX; let offsetY; let dragElement = null; const dropElement = document.getElementById("id-drop"); onDragStart = function(ev) { const rect = ev.target.getBoundingClientRect(); offsetX = ev.clientX - rect.x; offsetY = ev.clientY - rect.y; dragElement = ev.target; }; drop_handler = function(ev) { ev.preventDefault(); const left = parseInt(dropElement.style.left); const top = parseInt(dropElement.style.top); dragElement.style.position = 'absolute'; dragElement.style.left = ev.clientX - left - offsetX + 'px'; dragElement.style.top = ev.clientY - top - offsetY + 'px'; dropElement.appendChild(dragElement); }; dragover_handler = function(ev) { ev.preventDefault(); ev.dataTransfer.dropEffect = "move"; };

<div id="id1" draggable="true" ondragstart="onDragStart(event)" style="border:2px solid green; cursor:pointer;width:100px;height:50px;">拖动的Div #1</div> <div id="id2" draggable="true" ondragstart="onDragStart(event)" style="border:2px solid green; cursor:pointer;width:100px;height:50px;">拖动的Div #2</div> <div id="id-drop" style="position:absolute;left:200px;top:50px;border:2px solid red; cursor:pointer;width:200px;height:200px;" ondrop="drop_handler(event)" ondragover="dragover_handler(event)">放置的Div </div>