写出以下代码的运行结果,支出此代码的不足之处并且给出优化建议

时间：2020-12-14 16:12:27
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        function fn(){
            var n = 0;
            function m(){
                n += 1;
                console.log(n);
            }
            return m;
        }
        var result = fn();
        result();
        result();
        result();
        result();
        result();
        result();
        result = null;
        result();
    </script>
</head>
<body>

</body>
</html>
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