<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style type="text/css">
#info {
100px;
height: 100px;
background-color: red;
border-radius: 50%;
position: absolute;
}
</style>
</head>
<body>
<div id="info"></div>
</body>
<script>
class fn{
constructor(dom){
this.dom=dom
}
drag(){
this.dom.onmousedown = function(env){
console.log(this)
var env = env || window.event;
var disX = env.offsetX;
var disY = env.offsetY;
var that = this;
document.onmousemove = function(env){
console.log(this)
var env = env || window.event;
var L = env.clientX - disX;
var T = env.clientY - disY;
that.style.left = L + 'px';
that.style.top = T + 'px';
}
document.onmouseup = function (){
console.log(this)
document.onmousemove = null;
}
}
}
}
let a=new fn(document.getElementById('info'))
a.drag()
</script>
</html>
这是拖拽哦