请老师检查下代码，谢谢

来源：2-11 编程练习

不厌_

2021-06-30 12:57:35

想问一下老师，实际开发中是不是数组遍历用for of，对象遍历用for in？

相关代码：

<!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 obj = {
            "0": "xm",
            "sex": "male",
            length: 2
        }
        // 在此补充代码
        obj[Symbol.iterator] = () => {
            let index = 0;
            return {
                next() {
                    index++;
                    if (index == 1) {
                        return {
                            value: obj['0'],
                            done: false
                        }
                    } else if (index == 2) {
                        return {
                            value: obj.sex,
                            done: false
                        }
                    } else if (index == 3) {
                        return {
                            value: obj.length,
                            done: false
                        }
                    } else {
                        return {
                            done: true
                        }
                    }
                }
            }
        }
        for (let item of obj) {
            console.log(item);
        }
    </script>
</body>

</html>