js json 元素个数

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

let objectLength = Object.keys(jsonObject).length;
console.log("JSON对象的元素个数:", objectLength); // 输出: 3

let jsonArray = [
  {"name": "John", "age": 30},
  {"name": "Anna", "age": 22},
  {"name": "Peter", "age": 45}
];

let arrayLength = jsonArray.length;
console.log("JSON数组的元素个数:", arrayLength); // 输出: 3

function countElements(json) {
  let count = 0;
  if (Array.isArray(json)) {
    json.forEach(item => count += countElements(item));
  } else if (typeof json === 'object') {
    Object.values(json).forEach(value => count += countElements(value));
  } else {
    count++;
  }
  return count;
}

let nestedJson = {
  "users": [
    {"name": "John", "details": {"age": 30, "city": "New York"}},
    {"name": "Anna", "details": {"age": 22, "city": "London"}}
  ]
};

console.log("嵌套JSON的元素个数:", countElements(nestedJson)); // 输出: 5