js搜索json的某个字段

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

console.log(data.name); // 输出: John
console.log(data["age"]); // 输出: 30

function searchField(obj, field) {
  for (let key in obj) {
    if (key === field) {
      return obj[key];
    }
    if (typeof obj[key] === 'object') {
      let result = searchField(obj[key], field);
      if (result !== undefined) {
        return result;
      }
    }
  }
  return undefined;
}

let complexData = {
  "person": {
    "name": "John",
    "details": {
      "age": 30,
      "city": "New York"
    }
  }
};

console.log(searchField(complexData, "age")); // 输出: 30

let dataArray = [
  { "id": 1, "name": "John" },
  { "id": 2, "name": "Anna" },
  { "id": 3, "name": "Matthew" }
];

let foundItem = dataArray.find(item => item.name === "John");
console.log(foundItem); // 输出: { id: 1, name: 'John' }