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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body {
            font-family: "Microsoft YaHei", serif;
        }

        body, dl, dd, p, h1, h2, h3, h4, h5, h6 {
            margin: 0;
        }

        ol, ul, li {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        img {
            border: none
        }
    </style>
</head>
<body>

<script>
    var a = 5;
    function fn() {
        var a = 10;
        alert(a);
        function b() {
            a++;
            alert(a);
        }
        return b;
    }
    var c = fn();
    c();
    fn()();
    c();
</script>
</body>
</html>

 

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