<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
#box{
width: 300px;
height: 300px;
background-color: red;
position:absolute;
top:0px;
left:0px;
}
</style>
</head>
<body>
<div id="box">
</div>
<script>
var box=document.getElementById("box");
box.onmousedown=function(event){
var e=event||window.event;
// 获取到当前的坐标点
var x=e.clientX-box.offsetLeft;
var y=e.clientY-box.offsetTop;
box.onmousemove=function(event){
var e=event||window.event;
var X=e.clientX;
var Y=e.clientY;
box.style.left=X-x+"px";
box.style.top=Y-y+"px";
}
box.onmouseup=function(){
// 当鼠标抬起时移动事件清除
box.onmousemove=null;
}
}
</script>
</body>
</html>
