图片跟随鼠标移动效果--- # 主题列表：juejin, github, smartblue, cyanosis, ch

<!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>