用for of遍历对象有什么好处？写这么多代码，每个属性都要指定出来。如果对象的属性很多，这么遍历就太麻烦了。

来源：2-11 编程练习

电磁护盾

2021-09-25 07:54:53

<!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
        // console.log(obj['length']);
        // console.log(obj['0']);
        // console.log(obj.sex);

        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 {
                            value: undefined,
                            done: true
                        };

                    }
                }
            }
        }
        for(const item of obj){
            // xm
            // male
            // 2
            console.log(item);
        }

    </script>
</body>

</html>

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