老师帮忙看下代码嘛谢谢

来源：2-37 编程练习

咸鱼王派大星

2021-03-18 15:02:27

<!DOCTYPE html>
<html>
<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>
</head>
<body>
<script>
        var year = Number(prompt('请输入你的出生年份'));
alert(year % 4 == 0 && year % 100 == !0 || year % 100 == 0 && year %400 == 0);
</script>
</body>
</html>

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