js获取json元素个数

let jsonObj = {
    "name": "John",
    "age": 30,
    "city": "New York"
};

let count = Object.keys(jsonObj).length;
console.log(count); // 输出: 3

let jsonObj = {
    "name": "John",
    "age": 30,
    "city": "New York"
};

let count = 0;
for (let key in jsonObj) {
    if (jsonObj.hasOwnProperty(key)) {
        count++;
    }
}
console.log(count); // 输出: 3

function countElements(obj) {
    let count = 0;
    for (let key in obj) {
        if (obj.hasOwnProperty(key)) {
            count++;
            if (typeof obj[key] === 'object' && obj[key] !== null) {
                count += countElements(obj[key]);
            }
        }
    }
    return count;
}

let jsonObj = {
    "name": "John",
    "age": 30,
    "address": {
        "city": "New York",
        "zipcode": "10001"
    }
};

console.log(countElements(jsonObj)); // 输出: 4