通过事件对象属性e.clientX / e.clientY（鼠标距离浏览器窗口左上角的距离），实现图片随鼠标一起移动的功能~
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
#pic{
position: fixed;
}
</style>
</head>
<body>
<img src="imgs/rose.png" id="pic" width="50px" height="30px">
<script>
var pic = document.getElementById("pic");
//通过鼠标移动事件 给图片添加left 和 top的值
// 给整个document文档添加鼠标移动事件
document.onmousemove = function(e){
e = e || window.event;
pic.style.left = e.clientX + "px";
pic.style.top = e.clientY + "px";
}
</script>
</body>
</html>