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JS let var 차이

Canyi 2022. 11. 8. 14:12

var

<!DOCTYPE html>
<html lang="en">
<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>
        function myTest() {
            
            if (true) {
                
                var val = 100;
                alert(val);
            }
            alert(val);
            
        }

        myTest(); 

    </script>
</body>
</html>

let

<!DOCTYPE html>
<html lang="en">
<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>
        function myTest() {
            
            if (true) {
                
                let val = 100;
                alert(val);
            }
            alert(val);
            
        }

        myTest(); 

    </script>
</body>
</html>

 

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