在使用sort()方法时遇到问题

function compareNumbers(a, b) {
  return a - b;
}

let numbers = [4, 2, 5, 1, 3];
numbers.sort(compareNumbers);
console.log(numbers); // 输出 [1, 2, 3, 4, 5]

function compareLength(a, b) {
  return a.length - b.length;
}

let words = ["apple", "banana", "cherry", "date"];
words.sort(compareLength);
console.log(words); // 输出 ["date", "apple", "cherry", "banana"]

function compareAge(a, b) {
  return a.age - b.age;
}

let persons = [
  { name: "Alice", age: 25 },
  { name: "Bob", age: 20 },
  { name: "Charlie", age: 30 }
];
persons.sort(compareAge);
console.log(persons);
// 输出 [
//   { name: "Bob", age: 20 },
//   { name: "Alice", age: 25 },
//   { name: "Charlie", age: 30 }
// ]