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来源：2-7 编程练习

慕斯2168053

2021-11-19 14:45:26

<!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>
        const arr = ["i", "m", "o", "o", "c"];

        for (let [index, value] of arr.entries()) {
            if (index == 2) {
                arr.splice(2, 1, value.toUpperCase());
            }
        }
        console.log(arr);
    </script>
</body>

</html>

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