<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Draggable DIV</title>
<style>
.draggable
{
width: 150px;
height: 150px;
background: #4CAF50;
color: white;
text-align: center;
line-height: 150px;
user-select: none;
position: absolute;
cursor: pointer;
}
</style>
</head>
<body>
<div id="mydiv" class="draggable">拖动我</div>
<script>
dragElement(document.getElementById("mydiv"));
function dragElement(elmnt)
{
var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
if (document.getElementById(elmnt.id + "header")) {
document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
}
else {
elmnt.onmousedown = dragMouseDown;
}
function dragMouseDown(e)
{
e = e || window.event;
e.preventDefault();
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
document.onmousemove = elementDrag;
}
function elementDrag(e)
{
e = e || window.event;
e.preventDefault();
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
}
function closeDragElement()
{
document.onmouseup = null;
document.onmousemove = null;
}
}
</script>
</body>
</html>
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