在JSON数组中查找

[
  {
    "name": "Alice",
    "age": 25,
    "city": "New York"
  },
  {
    "name": "Bob",
    "age": 30,
    "city": "San Francisco"
  },
  {
    "name": "Charlie",
    "age": 28,
    "city": "Seattle"
  }
]

const jsonArray = [
  {
    "name": "Alice",
    "age": 25,
    "city": "New York"
  },
  {
    "name": "Bob",
    "age": 30,
    "city": "San Francisco"
  },
  {
    "name": "Charlie",
    "age": 28,
    "city": "Seattle"
  }
];

function findObjectByAge(jsonArray, age) {
  for (let i = 0; i < jsonArray.length; i++) {
    if (jsonArray[i].age === age) {
      return jsonArray[i];
    }
  }
  return null;
}

const result = findObjectByAge(jsonArray, 30);
console.log(result);

{
  "name": "Bob",
  "age": 30,
  "city": "San Francisco"
}