<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
#pic {
position: fixed;
}
</style>
</head>
<body>
<img src="images/tianshi.gif" alt="" id="pic">
<script>
// 通过 鼠标移动事件给 图片添加 left 和 top 的值
// 获取元素
var pic = document.getElementById("pic");
// 给整个文档添加鼠标移动事件
document.onmousemove = function (e) {
e = e || window.event;
// 给元素的css 属性赋值
pic.style.left = e.clientX + "px";
pic.style.top = e.clientY + "px";
};
</script>
</body>
</html>
