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case04-3 变量的作用域.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>变量的作用域</title>
    <script>
        var name = "a";
        console.log(name);
       function f2 () {
         console.log(name);
       }
       f2();
        function f1(){
            var a;
            a = b = c = 9;
            console.log('a'+a);
            console.log('b'+b);
            console.log('c'+c);
        }
        f1();
        console.log('cc'+c);
        console.log('bb'+b);
        console.log('aa'+a);
    </script>
</head>
<body>
</body>
</html>