<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
li {
position: absolute;
left: 0;
100%;
list-style: none;
line-height: 40px;
cursor: pointer;
border-bottom: 1px solid blue;
background-color: rgba(16, 87, 243, 0.3);
text-align: center;
}
</style>
</head>
<body>
<ul id="box"></ul>
<script type="text/javascript">
const box = document.querySelector('#box')
box.style.position = 'relative'
let lis = ['TEXT1', 'TEXT2', 'TEXT3', 'TEXT4', 'TEXT5', 'TEXT6'];
lis.forEach((v, i) => {
const li = document.createElement('li')
li.innerText = "ITEM" + (i + 1);
li.style.top = (i + 1) * 40 + 'px';
move(li)
box.appendChild(li)
})
function move(element) {
element.onmousedown = function(event) {
const diffX = event.clientX - element.offsetLeft;
const diffY = event.clientY - element.offsetTop;
document.onmousemove = function(event) {
const moveX = event.clientX - diffX;
const moveY = event.clientY - diffY;
element.style.left = moveX + 'px';
element.style.top = moveY + 'px';
}
}
document.onmouseup = function() {
document.onmousemove = null;
}
}
</script>
</body>
</html>