js 获取json所有key

const json = {
    name: "张三",
    age: 25,
    city: "北京",
    hobbies: ["阅读", "运动"]
};

const keys = Object.keys(json);
console.log(keys); // 输出: ["name", "age", "city", "hobbies"]

const json = {
    name: "李四",
    age: 30,
    city: "上海"
};

const keys = [];
for (let key in json) {
    if (json.hasOwnProperty(key)) {
        keys.push(key);
    }
}
console.log(keys); // 输出: ["name", "age", "city"]

const json = {
    name: "王五",
    age: 28,
    city: "广州"
};

const keys = Object.entries(json).map(([key, value]) => key);
console.log(keys); // 输出: ["name", "age", "city"]

const json = {
    name: "赵六",
    age: 22,
    address: {
        city: "深圳",
        district: "南山区"
    },
    hobbies: ["音乐", { type: "运动", name: "篮球" }]
};

function getAllKeys(obj, parentKey = '') {
    let keys = [];
    for (let key in obj) {
        if (obj.hasOwnProperty(key)) {
            const fullKey = parentKey ? `${parentKey}.${key}` : key;
            if (typeof obj[key] === 'object' && obj[key] !== null) {
                keys = keys.concat(getAllKeys(obj[key], fullKey));
            } else {
                keys.push(fullKey);
            }
        }
    }
    return keys;
}

const allKeys = getAllKeys(json);
console.log(allKeys); 
// 输出: ["name", "age", "address", "address.city", "address.district", "hobbies", "hobbies.0", "hobbies.1", "hobbies.1.type", "hobbies.1.name"]