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来源：2-7 编程练习

慕UI4313976

2021-10-08 22:05:40

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        const arr = ["i", "m", "o", "o", "c"]
        //    在此补充代码

        for(let [index,value] of arr.entries()){
            console.log(index,value);
            if(value === 'o'){
                arr[index] = 'o'.toUpperCase();
                break;
            }
        }

        console.log(arr);
    </script>
</body>

</html>