<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
#div1{
width: 100px;
height: 100px;
background: red;
position: absolute;
}
</style>
<script>
window.onload=function(){
// onmousedown:选择元素
// onmousemove:移动元素
// onmouseup:释放元素
var oDiv=document.getElementById("div1");
oDiv.onmousedown=function(ev){
var ev=ev||event;
// 鼠标的位置-当前div距离浏览器左边的距离
var disX=ev.clientX-this.offsetLeft;
var disY=ev.clientY-this.offsetTop;
document.onmousemove=function(ev){
var ev=ev||event;
oDiv.style.left=ev.clientX-disX+"px";
oDiv.style.top=ev.clientY-disY+"px";
}
document.onmouseup=function(){
document.onmousemove=document.onmouseup=null;
}
}
}
</script>
</head>
<body>
<div id="div1"></div>
<div style="width: 100px;height: 100px;background: green;position: absolute;left: 400px;top: 200px;"></div>
</body>
</html>
