<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style >
#box{
width: 100px;
height: 100px;
background-color: pink;
position: absolute;/* 开启box1的绝对定位*/
}
</style>
<script >
window.onload = function(){
/*使div可以跟随鼠标移动 */
/*获取box*/
var box = document.getElementById("box");
//绑定鼠标移动事件
document.onmousemove = function(event){
/*获取到鼠标的坐标 */
var left = event.clientX;
var top = event.clientY;
//设置div的偏移量
box.style.left = left + "px";
box.style.top = top + "px";
/*必须要加单位px,否则显示不出来*/
};
};
</script>
</head>
<body >
<div id="box"></div>
</body>
</html>
clientX和clientY用于获取鼠标在当前的可见窗口的坐标
div的偏移量，是相对于整个文档的
效果.gif
