<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
#demo{
width: 400px;
height: 400px;
background-color: pink;
margin: 100px;
}
</style>
</head>
<body>
<div id="demo"></div>
</body>
</html>
<script>
var demo = document.getElementById("demo");
demo.onmousemove = function (event) {
var event = event || window.event;
var x = event.clientX - this.offsetLeft;
var y = event.clientY - this.offsetTop;
this.innerHTML = "横坐标是:"+x+"px 纵坐标是"+y+"px";
}
</script>
onmousemove 鼠标移动一像素就会执行的事件。