<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.box{
width:200px;
height:200px;
background-color: red;
position: absolute;
left:0;
top:0;
}
</style>
</head>
<body>
<p class='box'></p>
<script>
var box = document.querySelector('.box');
box.onmousedown = function(e){
var event = e || window.event;
var target = event.target || event.srcElement;
var disX = event.clientX - target.offsetLeft;
var disY = event.clientY - target.offsetTop;
document.onmousemove = function(event){
// 注意：这里要有自己的事件对象
target.style.left = event.clientX - disX + 'px';
target.style.top = event.clientY - disY + 'px';
document.onmouseup = function(){
document.onmousedown = null;
document.onmousemove = null;
}
}
}
</script>
</body>
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