HTML 部分
<div id="box" style="width: 200px;height: 200px;border: 1px solid red;position: absolute;left: 0;top: 0;"></div>
js 部分
<script>
let is = false
let arr = null
const box = document.querySelector('#box')
box.addEventListener('mousedown',function(e){
is = true
arr = [e.clientX,e.clientY]
})
document.addEventListener('mousemove',function(e){
if(!is) return
let x = e.clientX
let y = e.clientY
const datay = y - arr[1]
const datax = x- arr[0]
const left = parseInt(box.style.left || 0)
const top = parseInt(box.style.top || 0)
box.style.left = datax + left +'px'
box.style.top = datay + top + 'px'
arr=[x,y]
})
document.addEventListener('mouseup',function(e){
is = false
})
</script>
都蛮简单的，如果还有不懂可以私聊或者评论
