我正在建立一个网站，人们可以在该网站上拖放形状来制作自己的作品。我想有4种形状可以拖动，但是形状会复制并保持不变，因此您可以随意使用它多次。
我知道HTML，CSS和一些JS，并且设法使形状可拖动（带有一些教程），但是我不知道如何使它们复制。任何建议将不胜感激！谢谢！
// Make the DIV element draggable:
dragElement(document.getElementById("mydiv"));
function dragElement(elmnt) {
var pos1 = 0,
pos2 = 0,
pos3 = 0,
pos4 = 0;
if (document.getElementById(elmnt.id + "header")) {
// if present, the header is where you move the DIV from:
document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
} else {
// otherwise, move the DIV from anywhere inside the DIV:
elmnt.onmousedown = dragMouseDown;
}
function dragMouseDown(e) {
e = e || window.event;
e.preventDefault();
// get the mouse cursor position at startup:
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
// call a function whenever the cursor moves:
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e = e || window.event;
e.preventDefault();
// calculate the new cursor position:
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
// set the element's new position:
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
}
function closeDragElement() {
// stop moving when mouse button is released:
document.onmouseup = null;
document.onmousemove = null;
}
}#mydiv {
position: absolute;
top: 100px;
left: 100px;
z-index: 9;
background-color: #ffffffff;
text-align: center;
cursor: move;
transform: translate(-50%, -50%) scale(0.5);
}<div id="mydiv">
<div id="mydivheader"><img src="m1.png"></div>
</div>
<script src="drag.js"></script>拖放拖动的div时，OP代码的这些修改将执行以下操作：
复制拖动的div，并将其添加到 <body>
将拖动的div返回到其起始位置
const mydiv = document.getElementById("mydiv");
// Make the DIV element draggable:
dragElement(mydiv);
function dragElement(elmnt) {
var pos1 = 0,
pos2 = 0,
pos3 = 0,
pos4 = 0;
if (document.getElementById(elmnt.id + "header")) {
// if present, the header is where you move the DIV from:
document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
} else {
// otherwise, move the DIV from anywhere inside the DIV:
elmnt.onmousedown = dragMouseDown;
}
function dragMouseDown(e) {
e = e || window.event;
e.preventDefault();
// get the mouse cursor position at startup:
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
// call a function whenever the cursor moves:
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e = e || window.event;
e.preventDefault();
// calculate the new cursor position:
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
// set the element's new position:
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
}
function closeDragElement() {
// stop moving when mouse button is released:
document.onmouseup = null;
document.onmousemove = null;
// ****** start added code ******
// create a clone of mydiv and append it to body
const newDiv = mydiv.cloneNode(true);
document.body.appendChild(newDiv);
// move mydiv back to its starting position
mydiv.style.top = null;
mydiv.style.left = null;
// ****** end added code ******
}
}#mydiv {
position: absolute;
top: 100px;
left: 100px;
z-index: 9;
background-color: #ffffffff;
text-align: center;
cursor: move;
transform: translate(-50%, -50%) scale(0.5);
}<div id="mydiv">
<div id="mydivheader"><img src="https://via.placeholder.com/80/"></div>
</div>
<script src="drag.js"></script>本文收集自互联网，转载请注明来源。
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