使用工具
VsCode
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>鼠標(biāo)拖拽效果</title>
<style>
#box{
width: 300px;
height: 200px;
background-color: aquamarine;
position: absolute;
}
</style>
</head>
<body>
<div id="box"></div>
<script>
let box=document.getElementById("box")
box.onmousedown=function(e){
let ox=e.offsetX
let oy=e.offsetY
document.onmousemove=function(e2){
let cx=e2.clientX
let cy=e2.clientY
let_left=cx-ox
let_top=cy-oy
if(_left<0){
_left=0
}
if(_top<0){
_top=0
}
if(_left>document.documentElement.clientWidth-box.offsetWidth){
_left=document.documentElement.clientWidth-box.offsetWidth
}
if(_top>document.documentElement.clientHeight-box.offsetHeight){
_left=document.documentElement.clientHeight-box.offsetHeight
}
box.style.left=_left+"px"
box.style.top=_top+"px"
}
}
document.onmouseup=function( ){
document.onmousemove=null
}
</script>
</body>
</html>